Questions tagged [hvac]

HVAC - Heating, Ventilation, Air Conditioning.

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45 views

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 ...
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23 views

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 ...
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1answer
54 views

Why does the car heating system won't start for the first 15-20 minutes of driving in the winter?

My car heating system does not start for the first 15-20 minutes of driving in the winter. It happens all the time, no exception. The colder outside the longer it takes to start working. After 15-20 ...
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1answer
43 views

Is it ok to wipe down hvac intern aka with white vinegar/bleach? [duplicate]

I am going to be cleaning inside the scuttle panel and taking the my HVAC system apart to clean inside it. Is it ok to mix white vinegar or bleach/Dettol(similar to Lysol cleaner marketed in the USA) ...
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3answers
706 views

How do race drivers clear foggy windscreens?

I know that, in order to decrease weight, race cars may remove AC and heating systems as these are not essential. However, when driving, if their windows get foggy due to cold weather, how do they ...
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1answer
71 views

Cool Ventilated and heated seats, can both options be used at once?

In our S 350, both can be turned 'on' at the same time in the front and rear seats. Now it that going to mess up the motor?
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26 views

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 ...
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1answer
26 views

HVAC Flow Control - A/C Won't Blow Through Dash Only

In my 2010 Mazda 3, the switch that adjusts the flow control works generally, but when I adjust it to blow only through the dash vents, it still blows primarily at the feet (the adjacent setting) and ...
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45 views

What is going on in the back of my van?

I don't know what the heyl is goin on the back of my van (5.4 v8 E150 1998 conversion style)! It's a doosey of a conversion van, so you bet there is a whole separate box back there for (I think?) both ...
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2answers
36 views

HVAC clutch cycle

2007 3.0R Subaru Outback - the hot & cold climate air work OK. I've checked the clutch gap which is within the tolerance specified by the factory service manual. Often when climate temperature ...
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1answer
56 views

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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1answer
34 views

If I go in and remove car evaporator, does that mean I will no longer be getting any smell problems?

Despite using ac cleaners car smell keeps coming back. Even if you use something like kool-it you can still expect it to return. The only way to remove the problem is get to the source and clean\...
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2answers
61 views

2006 Ford XLT Front Dash Vent Door plastic lever broken that was attached to the Mode Actuator (which works)

2006 Ford Explorer XLT. Got a loud snap sound with small piece bouncing around under dash on passenger side. Air flow changed to def and floor only. Searched online, pulled glove box, Front vent ...
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24 views

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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1answer
29 views

HVAC not providing heat in the vehicle

I have a Vauxhall Insignia. I've had the waterpump, thermostat, and housing replaced. It's still not getting hot air in the car. Also, had 2 sniff tests done and compression tests done, both passed? ...
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1answer
70 views

2014 CX-5 hot air - possible overheating?

Hopefully someone can shed some light into what's going on. For the last couple of days we have been in a cold snap around -30C. I was driving the car and noticed that the ambient (outdoor) ...
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1answer
54 views

heater is cold until I hear a noise and heat starts immediately

I think the answer to this is easy but I'm not sure of the part name. I'm driving along and have the heater on, but it's blowing cold air. Then I hear kind of a "clackety clack", and then the air ...
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10 views

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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1answer
43 views

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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1answer
21 views

When spraying anti bacterial agent into the Ac, do you need to remove your pollen filter?

The pollen filter maybe at front of or behind blower motor. I have been watching videos on clearing ac smells and some show that you should remove the pollen filter and spray directly onto the blue ...
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1answer
50 views

If ac gives rotten egg smell, does that mean there is an animal in the system?

I have just read that if you’d ac is giving a rotten egg smell, it’s probably because an animal has climbed in and died in the vents. Is it true and if so, I guess just spraying with lycos isn’t ...
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1answer
44 views

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 ...
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1answer
686 views

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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1k views

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(...
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1answer
13 views

2005 ford free star v6 front wheel drive

I have a problem with my A/C where it blows air fine in the rear but it wont blow in the front dash only by the feet and i noticed when i disconnect the battery everything works fine ontil it just ...
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1answer
104 views

2010 Jeep Compass makes a smacking noise under the dash when the fan is turned on

It does not matter if it is heat or ac. My ac compressor quit and I replaced it and had air for one day. Checked the vacuum and the freon all looks great it quit working when the noise started coming ...
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2answers
61 views

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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1answer
1k views

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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1answer
204 views

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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3answers
3k views

What is the purpose of high pressure service port in cars ? Can we charge refrigerant into the system by high side service port?

I have read on internet and in Tesla Model S service manual book that we can charge refrigerant by high pressure service port (with gas charging machines or another way) as long as there is vacuum in ...
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0answers
91 views

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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105 views

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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129 views

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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2answers
8k views

What happens to car A/C when outside temperature is very low (about 55 degrees fahrenheit)?

I bought a used car and its the first winter since I had this car. A/C in summer was working just fine. But today I saw the outside temperature was about 55 degrees and I turned the A/C to the blue ...
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0answers
2k views

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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2answers
9k views

Is it okay or useful to run heat and AC at the same time?

Most cars that I've seen in my life have a heat slider or dial, which goes from coldest to hottest, and also a button or switch that is labelled "AC". When the heat dial is set to cold, turning on the ...
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1answer
30 views

Blower stopped working

My blower stopped working suddenly on my 04 Trailblazer. I figured it was the resistor but as Murphy's law would have it, the battery died a few days later. I replaced the battery and the blower ...
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1answer
62 views

Blower motor not blowing

I have a 2006 Chevy Equinox and the blower motor will not blow at all. I replaced the blower motor and it would blow intermittently for a few days then stopped all together so I then replaced the ...
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0answers
43 views

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 ...
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3answers
8k views

Does outside temperature sensor affect the HVAC system?

Car: 2010 Mazda 3 2.5L Manual My car's outside temperature display is way off. It is showing warmer than the actual temperature. For example: Today the real temperature was -9C and it showed +18C. ...
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1answer
264 views

No heat when idle

I have a 2013 Dodge Grand Caravan. I had the heater core replaced recently and now I don't have heat on the right front passenger side. I have flush the line both front and back and ensured the ...
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2answers
1k views

Can I replace my AC Compressor myself? 2008 Vauxhall Astra 1.9

On my 2008 Vauxhall Astra 1.9 CDTI my AC Compressor has gone I was wondering how easy it is to replace myself? I'd get the system drained at a garage first. I've included the service instructions ...
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0answers
371 views

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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0answers
90 views

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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0answers
28 views

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
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2answers
194 views

AC cycle off too long when driving

My AC system has been problematic recently on 2014 Ford with barely 31000 miles. Its uses Visteon 16 compressor. When driving, after some minutes, it will shut off for long enough until the vent ...
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1answer
28 views

Excessive A/C condensate on outsideof box

When running the A/C on my 2011 Chevy 2500 Duramax the outside of the heater box gets saturated in condensate. After 1 hour of running i'll have a 1/4" deep puddle on the passenger floor. It's not a ...
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1answer
1k views

AC Compressor runs for 45 mins and shuts off

This is on a 1997 Chevy C2500 with a 5.7L. It has a new AC compressor, AC condenser, AC Manifold hoses (suction and discharge). After an evacuate and recharge, the AC blows ice cold for about 45 mins (...
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0answers
353 views

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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1answer
3k views

AC clutch not engaging

I have a 2007 Honda Fit. Two summers ago, my AC stopped working. I brought it to a shop, where the compressor was replaced. This fixed the problem at first, but last summer the AC started working ...