Questions tagged [hvac]

HVAC - Heating, Ventilation, Air Conditioning.

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Fan settings won’t change on 2015 Ford Explorer [closed]

The fan on my 2015 Ford Explorer is stuck on defrost and won’t change any ideas
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Mercedes C200 (W204) air con not heating/cooling

I've got a Mercedes C200 (W204) from 2011 (facelift model) with a working air con (air blows out) but not getting cold or hot. I've taken it to a local mechanic that in less than 1h diagnosed it as a ...
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AC starts cold, then becomes warm

2006 Ford Mustang - Ok so I've replaced the compressor clutch and accumulator. Every time the ac starts to blow cold the cooling fans turn on at the radiator and I can hear a click and the cooling ...
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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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2017 Kia Sorento Dual Climate - how is it suppose to work

When I start my AC on low for both sides, air is blowing cold as expected. When I turn driver side up to say 72 degrees, it seems like the passenger side gets a little warmer but I don't think 72 ...
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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 ...
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Abnormal Fan Switch Voltages?!? '99 Wrangler SE/TJ fan issues

So I've managed to get the blower motor out of my jeep, and while I'm gonna try to salvage the seemingly spent motor (more about this in a different question), the voltage being sent to the motor ...
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My Ac starts fine everyday runs cold for 40mins then goes into intermittent mode

Hi I have a 2012 VW Passat that has a faulty Ac it will run perfect first time you start the vehicle Ac will run cold for 40mins then suddenly it goes warm will come back on for a few mins then warm ...
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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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Vehicle AC works initially, but after driving for a while (hour+), the airflow drops to the point being ineffective

I have a 2004 Ford Excursion with the 6.0 powerstroke. Most the time, the AC works fine, but after a long drive in hot weather, the front AC barely blows out of the vents. The rear works fine, in fact,...
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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 ...
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Clicking sound on left side of dash possibly related to AC

So I got a new car some weeks ago. It's a Renault/Dacia Duster 2021. During the past week I took it on a long trip and reached the first 1000 km. During that trip I started noticing a clicking sound ...
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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 ...
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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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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 ...
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A/C: Why does the LOW-side pressure *increase* when the compressor runs?

My heater badly needed replacement (leaking a fine mist of coolant inside the cabin), the A/C hadn't held a charge for years, and they're both in the same box that's a pain to get to and you have to ...
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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.
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What happens if the AC evaporator ices over?

I am thinking of replacing the air conditioning evaporator temperature sensor in my 2011 ford fusion with a resistor, since the dash must be removed to replace the sensor. The warning that goes with ...
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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 ...
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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 ...
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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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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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4 votes
3 answers
993 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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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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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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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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2 answers
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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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1 vote
1 answer
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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 answer
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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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2 answers
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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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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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2 votes
1 answer
32 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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1 vote
1 answer
110 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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1 vote
1 answer
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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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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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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 votes
1 answer
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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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0 votes
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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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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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1 vote
1 answer
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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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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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0 votes
1 answer
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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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1 vote
1 answer
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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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2 answers
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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
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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
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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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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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2 votes
0 answers
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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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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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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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