Questions tagged [hvac]
HVAC - Heating, Ventilation, Air Conditioning.
49
questions with no upvoted or accepted answers
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Clunking noise from dash of 2005 Ford Explorer
All of a sudden there is a loud clunking noise coming from the dash of my 2005 Ford Explorer.
Observations
It definitely sounds cyclical.
Exists only when climate control system is ON.
Sound ...
- 51
5
votes
1
answer
10k
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2006 Jeep Liberty - AC clutch won't engage
The AC clutch on my Jeep Liberty 2006 won't engage. Here is what I have checked so far.
Fuse 14 in the passenger cabin
21 in the engine compartment are ok
AC relay ok
When I jump the AC relay I ...
- 51
5
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0
answers
123
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What's this strangely marked control on my Eclipse?
My 1995 Mitsubishi Eclipse, and presumably other Mitsubishis of the same era, has a control over by the rear windshield wiper control, near the center vents. It's got 2 pictures of a person sitting. ...
- 12.5k
3
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63
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Chrysler Sebring 2007 Hvac
My Ride Chrysler Sebring 2007 Driving side AC is blowing hot air while passangr side is cold. Any theories?
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1
answer
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AC system automatically switching to hot defrost
In my 2009 Dodge Grand Caravan I recently had the AC compressor replaced. Since then, while running the AC the system will automatically and randomly switch to pushing hot air out of the defrost vent ...
- 31
3
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0
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Heater only blowing cold air
I have a 1997 F150 with a 4.2L engine. The engine warms to a normal operating temp. Blower motor is fine. No matter where the AC/Heater control switch is turned to I only get cold air. Im thinking the ...
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3
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0
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132
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2010 Volvo S80 - Cabin HVAC system schematics
Something in my sedan's cabin air system smells bad (organic bad, not mechanical bad), even after changing the cabin air filter.
I have a bore scope, vacuum, compressor, and hoses sufficient that I ...
- 1,189
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0
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98
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Why may heating gradually stop after some time driving (and doesn't work in passenger side at all)?
This is a somewhat strange problem. Heating (in driver side) seems to work normal - after somewhere between 15-25 mins. driving or so, it gradually stops working. The warming in passenger side doesn't ...
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0
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377
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A/C Air Recirculation
In my 2017 Toyota 4Runner I'm interested in a solution to keep recirculation on by pushing a button even when the defrosters are on. In other words, a wire to override the defrosters so recirculation ...
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0
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61
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Are there any cars where the blower motor is controlled by switched mode power supply?
I have seen many questions here related to blower motor resistors. That sounds like a really old-fashioned kind of technology. This made me wonder whether there are any cars that would use a switched ...
- 14.5k
2
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0
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179
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Toyota Yaris 2010 A/c problem
I have a weird problem with the A/C on my Toyota Yaris 2010. The A/c takes time to cool after being in the sun for a long time, and when the A/c does cool somewhat, it starts behaving weird. When the ...
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63
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Can I add a rear evaporator in place of my rear heater for my passengers
I live in a hot climate. I do not need heat to my rear passenger feet. Can I run A/C pipes instead of hot water and replace radiator with an evaporate. The Vehicle is a 1988 Toyota BJ74. The blower ...
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0
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5k
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Can a blend door be easily fixed/replaced in a Ford Escape Hybrid 2006? Also, passenger side airbag removal?
I recently got my AC compressor fixed, but after doing this it turns out my AC still isn't great because of a messed up blend door (according to my mechanic). Apparently this is a fairly common ...
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Sixth Generation Toyota Camry - HVAC Defrost Mode Actuator Installation Instructions Needed
I am working on my car, which is a sixth generation Toyota Camry. She's been great to me..so far. Mine in particular is a 2008.
The issue pertains to the HVAC system. While hot (and cold) air does ...
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0
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116
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09 ford flex A/C is blowing warm, Compressor clicking on and runny,pressure on low side well over 100
AC worked fine find about a week ago and then just stop stop working, got a couple of cans of freon and Hooked up the connection and the pressure was showing very high very high almost to the top ...
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239
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A.C. compressor doesn't turn on
2011 Ford Escape 3.0 FWD.
System has charge, no leaks, new expansion valve. Compressor fuse was removed. When turning on the AC. The fan did not kick on and compressor did not activate. Both fans ...
- 3,032
1
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0
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945
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Bizarre Lack of Heat From Heater Vents - 2010 BMW E91 318d
I have an issue I'm struggling to pin down with my 2010 318d 3 Series Touring: All air vents blow cold or at best, luke warm air into the passenger compartment, even on long journeys when the vehicle ...
- 111
1
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0
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638
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2008 Mini Cooper S (R56) A/C compressor won't run
I've been in the process of putting my 2008 R56 Mini back together after replacing the timing chain, vacuum pump, turbo oil lines, and oil filter housing gaskets. If you've worked on one of these you ...
- 12.1k
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0
answers
54
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2011 Prius AC job
2011 Toyota Prius AC Job
Never done one, any tips on how complicated it is.
Evidently the compressor is an electric unit?
I know the basics but do not have a charge machine, so its old school for me ...
- 8,010
1
vote
1
answer
88
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Was charging the a/c and the pump engaged but just warm air came out
Put a vacuum to the a/c then charged it. It took 1.5 of the 2.5lbs it calls for and so I fired it up and turned on the a/c.
The pump engaged but the air was still warm and the pump got real hot, too ...
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1
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0
answers
27
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Squeak when changing to face or defrost
Good afternoon I had a squeak that would happen when I turned my air to the face vent it would only squeak at the very end of the actuator cycle. Here is a link to the video of that https://youtu.be/...
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1
vote
1
answer
7k
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Can I vacuum a/c system from low side only
I have a 90 suburban the Schrader valve in the high side is non removable and the line is discontinued. Napa can make a new hose with out valve. Can I vacuum from just low side?
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172
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How to keep air recirculation on permanently
I am looking to find a way to have the recirculation always in the ON position for my 2018 Toyota Rav4 Hybrid Limited.
I understand it's unhealthy to leave the same air in your car but I don't ...
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1
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0
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3k
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My Air conditioner is blowing hot on the left side and cold on the right
My air conditioning in my Camaro ss 2012 is blowing hot on the left side and cold on the right. Anyone knows what the problem could be??
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0
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52
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1999 Honda Accord HVAC gets stuck on dash mode
The HVAC on my 1999 Honda Accord gets stuck on the dash mode. All of the control buttons work and I can cycle from one to the other until I put it on dash only mode. Once there, the motor stops ...
- 11
1
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0
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94
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Diagnosing AC performance after repair
Background: Vehicle is 92 Civic with R-12 AC system. Compressor was replaced 2 years ago due to leak diagnosed there by AC technician (not sure if that was actually the problem). All but about 100g of ...
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0
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35
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Ford Expedition Rear HVAC not turning on
I've turned the selection dial on but the rear HVAC unit isn’t coming on. I've checked to see if everything is connected but it's still not working
- 51
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0
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35
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No air-conditioning
If the AC was leaking and someone unhooked the AC unit, would that be causing the belt to squeak now?
If so, what would you suggest?
- 11
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0
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496
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2007 Jeep commander, car blows hot (extremely) air
Had actuator as well as controll head replaced and car still blows hot air. When controls are in off position hot air will blow in. Turn ac on hot air still blows in. Been to two Jeep dealers and ...
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0
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86
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Where is the air hose from the manifold located on a 2006 jeep liberty?
I have no heat at idle in my jeep liberty and I'm hoping to just repair as a temp fix.
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1
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1
answer
729
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Is my car ac condenser clogged?
I hosed down the condenser in my car today to see if it improves my ac
What I realized is that the water didn't dry on some certain spots like the rest of the condenser.
The top and the sides were ...
- 11
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0
answers
71
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2017 Ford explorer HVAC blower motor will occasionally start when the motor starts however will turn off shortly after
I have a 2017 Ford explorer which has an intermittent issue with the blower motor. About 95% of the time when starting up the car, the blower motor will not start at all and will not respond to any ...
- 215
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1
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113
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1989 Chevrolet S10 Blazer AC issue
I have a 1989 S10 Blazer with a 4.3 L V6 engine.
It has an AC that is giving me some trouble.
Observed Behavior: When i slide the mode selector to any AC mode , it blows the ac fuse.
Ive replaced the ...
- 351
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0
answers
18
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Top fans not working bottom floor fans working
Recently in a Honda CR-V 2011 the top fans stopped working but the floor fans are working. I’ve checked under the hood and both fans are running. It seems like changing the ac control options on the ...
- 409
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0
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26
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AC cools middle vents, remaining vents receive airflow but it is not cooled
In a 2015 Subaru Impreza, when the A/C compressor is powered on, the two middle vents blow air that was obviously cooled. However, the remaining vents (one on dashboard near drivers' door, one on ...
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0
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326
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Can I apply dielectric grease to a blower motor resistor body?
I have a 2001 Camry (North America model) which (in)famously puts the open-body blower resistor in the ducting to cool it, which leads to enormous corrosion and burnout problems in humid/salty ...
- 1
0
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0
answers
54
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Low pressure port on AC system read too high; compressor won't come on
my AC on a 2000 Nissan frontier has excessive pressure on the low pressure side . The compressor is also not coming on. Is there a high pressure switch that comes on the cuts power to the compressor ...
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0
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57
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Automotive AC Diagnosis Chart / Resources
Has anyone found a good automotive AC diagnosis chart? I can find some suggesting pressure ranges, and even temperature and pressure ranges, but I cannot find a good source which also includes ...
- 2,115
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0
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22
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2002 Toyota 4Runner intermittent HVAC issue
2002 Toyota 4Runner intermittently starts blowing hot air no matter where temp setting is at. Fiddling with temperature knob resolves issue.
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1
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112
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Can I get a HVAC diagram that shows vent locations and components for 2005 Ford Freestar
I have a 2005 Ford Freestar that has floor and ceiling vents in the back of the cab. I'm interested in installing a 3rd party external heater and would like to see the ventilation routings to ...
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1
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76
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When you HVAC fan on with AC and heat off, does it go past evaporator?
If you switch AC and heating off but put fan on, does it mean clean air gets pulled and put in cabin while staying separate from the evaporator? Or does this air pass by the evaporator then go into ...
- 2,736
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4k
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How to clear air vents of leaves and other such debris?
Car is a civic vti 99. It was left under a tree for some 8 months or so.
Recently started to use it and smelt bad. Cowel screen and under it was covered in leaves and pollen and the the cabin filter(...
- 2,736
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2
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76
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A/C malfunction
What could cause the pipe out the compressor of the car to be too hot, I mean too hot to be touched with a bay hand, while the pipe after the condenser is slightly warm or rather normal.Then I noticed ...
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1
answer
3k
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2013 Focus SE Dash Vents not blowing AC or heat, all other vents work fine
The climate control in my 2013 Ford Focus doesn't blow anything out of the dash vents. Defrost and floor vents blow fine and I can select between them without issue, but when I select only the dash ...
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2
answers
854
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2018 Toyota Camry - Loud Idle When AC is On
I have a 2018 Camry (less than 5K miles), and when it's in gear with my foot on the brake, it has a loud idle. The first time I heard it I was in line at a McD's and I thought to myself, "I hope that ...
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0
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348
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Why ambient temperature used to measure pressure for car ac system
Since the ac system is located mostly inside a car engine and the car is warmed up prior to adding freon, and the temp/humidity in engine bay is different from ambient temperature//humidity, and all ...
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1
answer
89
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Citreon C4 Grand Picasso HVAC inoperative
I havent driven my C4 since before Christmas but ive been starting it regularly and keeping it snow free. Just started it again but the air con and demister isn't working. Could it be frozen?
- 1
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0
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414
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Clicking sound from AC on startup
I have a 2008 Jeep Grand Cherokee that makes a very loud clicking noise when I turn the AC on just after starting the car. It only happens every so often and it lasts about 20 seconds. It sounds like ...
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1
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Air control system in cabin
2016 Air distribution functions fine on passenger side. Drivers side only blows hot air. Have not tried anything yet. Want to make sure I am looking at correct component.
