Questions about Air conditioning systems - other Heating and ventilation questions should use 'hvac'

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41
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5answers
148k views

Why does my A/C blow foul smelling air when it first turns on?

Most of the time when I first turn on the A/C in our 2008 Toyota Sienna, the air that blows out has a very distinct chemical - nasty smell. After a while it seems to go away. I'm not sure if I just ...
18
votes
2answers
27k views

Is starting your car with the A/C on bad?

I was always yelled at by my father when I was first starting to drive when I left the A/C on when I turned off the car, and then later turned it back on, with the reasoning that I was ruining / ...
11
votes
2answers
3k views

Why is car A/C typically less reliable than fridges/freezers?

I just had the A/C in my car die on me again; air coming through the vents with the A/C is just as warm with it turned on as off. However, my fridge/freezer is something I've had for over 5 years and ...
10
votes
1answer
322 views

Volkswagen A/C Intermittent

I want to repair my Volkswagen Passat '07 A/C. I've taken it to two shops (dealer and independent) and they both say the entire a/c system needs to be replaced. The strange thing is, that sometimes it ...
9
votes
1answer
11k views

Huge puddle of water under car

I parked my Dodge Viper after driving for about two hours (in July, ~90°F, AC at full blast). Half an hour later I noticed a huge puddle under the engine, on the passenger side. I am pretty sure it ...
9
votes
2answers
228 views

Where can A/C condenser be located other than in front of radiator?

1953 F-100 w/ 428 Cobra Jet FE motor. I want to spare my grill and avoid putting the condenser in front of the radiator. Plus, it's already a beast to cool in hot weather, and I live in hell. (It's ...
8
votes
2answers
5k views

Why might I experience a power falloff after starting my car with the AC On?

I have a 2000 Chrysler Neon which generally runs well. I have noticed that if I start the vehicle, turn the AC on and reverse out of the driveway, the engine seems to struggle/sounds like it is going ...
8
votes
1answer
298 views

How to get items out of the HVAC system from a 2003-2007 Honda Accord

Before I ruin my dashboard/car, I wanted to know if my approach is correct. I don't know much about cars but logically, it seems like a simple enough task to remove vents, reach in and grab items, ...
7
votes
7answers
74k views

How do you detect and deal with a refrigerant leak?

My heat works great, but my AC is nonexistent. Just blows out normal air, which in this weather is quite hot and unpleasant. I had the refrigerant refilled two years ago, but I haven't used the car ...
7
votes
2answers
1k views

What problems can come from AC not running for years?

I have an 81 Chevy C10 that I inherited from my dad. This truck has mostly sat for the last seven years, with me running it enough to keep it in condition. I've been using this truck mainly for the ...
7
votes
2answers
2k views

AC: Fixing or Recharging?

I have Toyota Camry 2000. The problem is AC does not blow any cold air. So, I bought R134a and recharging it myself. It costs me about $12. However, it lasts for about a month. I checked with couple ...
7
votes
1answer
136 views

Shutting off fans at highway speeds

On my vehicle (92 Civic) and most others I've seen, the condenser fan comes on whenever the A/C clutch is engaged. This seems like a waste of electricity (and thus fuel) when cruising at 60-75 mph, ...
7
votes
1answer
284 views

Low-side and high-side pressures lower than expected after AC repair

I just did my first automotive AC repair, after the compressor in my 2004 Lancer 2.0 ate itself, cracked its casing, and blew all the refrigerant out. I think I did the repair & recharge ...
7
votes
3answers
10k views

How to fix leaking air conditioning schrader valve

I have a 98 jeep cheerokee sport. The air conditioning coolant leaks. After doing some diagnostics, I detected audibly a hissing sound coming from the low input port, leading me to believe the ...
6
votes
4answers
12k views

Easiest way to disable the A/C compressor

My A/C system has a leak in it and my compressor is making an awful noise: probably needs replacing. Winter is coming though, and I really don't want to spend any time or money on tracking down leaks ...
6
votes
2answers
16k views

Engine Bogs down with A/C on highway

This started to happen relatively recent. It's 2003 Chevy Trailblazer. What is happening when the engine is idling and I turn the A/C on or the defroster (which also uses the A/C I believe), the ...
6
votes
2answers
43 views

1986 VW Westfalia van A/C

I had my AC refrigerant professionally changed to Red Tek in my van. It worked well for 2 or 3 years but then stopped cooling. I successfully refilled with difficulty and it was fine for a further ...
6
votes
1answer
1k views

Why would turning on the A/C affect my alternator output voltage?

So yet another chapter unfolds in the A/C gremlin saga of my LS1 Chevy. Backdrop A/C compressor is relatively new (2 years old) One of the belts is squeaking (not sure which one) Recently performed ...
6
votes
1answer
2k views

Heater smells like sulfur

I drive a 2006 Toyota Sienna. When driving with the heater on I often smell sulfur. This is more common when I am driving up a hill, but if I turn the heater off, the smell goes away. What causes this ...
6
votes
2answers
4k views

Air Conditioning Cools Intermittently

I have a 2001 Honda Civic. The A/C works pretty well - it comes on fast and blows cold. However, after 5 - 10 minutes it stops cooling and starts blowing warm air. If I turn the A/C off, after another ...
5
votes
3answers
11k views

How to recharge AC using booster from auto parts store?

The AC on my 2002 Chevy Cavalier stopped blowing cold in the fall and I had planned on getting it checked out and recharged once the AC check specials started. I saw this for $30 and it seems too ...
5
votes
2answers
2k views

Heat only works when engine is revving and at full power

On a 2004 Chrysler Sebring, the air only works when turned up to maximum power. At any of the 3 levels below that, no air comes out. Additionally, when the heat is on, it only blows hot air while the ...
5
votes
2answers
5k views

1998 Dodge Ram AC clutch won't engage

When I call for AC on the dash the clutch on the compressor doesn't engage. I disconnected the clip that connects the wire to the clutch and checked for voltage and there was none. People say that ...
5
votes
3answers
6k views

What is involved to recharge the Air Conditioning System?

What is involved to recharge the Air Conditioning System? I believe you need a machine to do it, so I am guessing you can't do it yourself.
5
votes
1answer
288 views

15 ppm of CO levels inside car

I constantly measure 15 ppm of CO inside my car after a long commute (~1 hour of continuous driving, but the overall trip can take from 1.5 to 2 hours depending on my destinations before heading ...
5
votes
2answers
157 views

Is it difficult to retrofit Air Conditioning?

Car: 2003 Opel Agila 1.2 I would like to retrofit Air Conditioning to my car, as I'm planning to travel to a hot place! My questions: Apart from charging and discharging the system, which I would ...
5
votes
2answers
41 views

How can I determine my HVAC layout?

Answers to Why does my A/C blow foul smelling air when it first turns on? suggest several fixes that depend on knowing where in the car they are located. I can't determine in any of my cars where the ...
5
votes
1answer
104 views

2014 Subaru Forrester AC Compressor clutch noise, slippage

We have a 2014 Subaru Forrester whose AC Compressor clutch operation is unlike other cars I've ever owned. The video linked is from when the car is cold and AC is engaged. It appears that the clutch ...
5
votes
1answer
403 views

What should I use to lubricate the flaps that controls the temperature and which vents the air comes out of?

The control shafts that move the flaps which control the the hot/cold air and which vents the air come out have broken. The car is a 1999 93 Saab so I'm assuming that the hinges (the flap has a peg ...
5
votes
1answer
225 views

Do I have to get another Volvo?

I live in Florida and have mold allergies. Multiple times my 2008 Sienna van has a bad AC smell develop which makes me cough my head off. The dealer has cleaned the evaporator and ducts and the ...
5
votes
1answer
5k views

toyota corolla 2001 air duct smell [duplicate]

My 2001 Toyota Corolla recently started smelling very foul whenever the air system was turned on. According to the research I've done online, there is no cabin air filter to change. The glove box ...
5
votes
1answer
174 views

Air Conditioning not cold on 2011 Honda civic

I have a 2011 Honda Civic LX with about 70k miles on it. As of a few weeks ago the AC really started having cooling problems; however, this all seemed to happen gradually. It seems to get a bit colder ...
5
votes
3answers
307 views

What AC component would likely be the problem with my consistent power loss while driving?

I have looked through the questions to find an answer to my question and none of the questions seem to similar enough to this. I have recently purchased a 2002 Subaru Impreza Rs and the car is doing ...
5
votes
0answers
511 views

What causes more gas consumption - Idling with AC or Heat? [duplicate]

So I have begun doing some research on the effects of idling. So my question is, does idling with the AC or heater on affect how much gas is given off? If possible, please give the percent of extra ...
4
votes
3answers
64k views

Why am I smelling exhaust inside the cabin of my car?

When I drive my car the first few miles, I smell exhaust inside the car with the windows rolled up. It happens when I have either the AC or the heat/air on... What's going on?
4
votes
4answers
1k views

RPM bouncing when in idle, especially when AC in switched on

I have a diesel common-rail 1.5l engined car. Lately I am facing an issue where the RPM needle is bouncing in the tachometer when the car is idling. The normal idling RPM is around 820. When idling, I ...
4
votes
4answers
13k views

What do I risk if I don't fix my leaking evaporator core on my 2004 Jeep GC?

The shop just tested my non-working AC, and recharged the freon - so, for now, it's working. Cost $118 all in. However, they tell me I have a leak in my evaporator core, and that it will take 16 ...
4
votes
3answers
322 views

Is it dangerous not having air conditioning cabin filter?

I'v got a Hyundai Accent 2005, recently I removed the ac filter because it was too dirty and the air didn't feell well but I couldn't buy it because of work, I have 6 days without the ac filter and I ...
4
votes
1answer
5k views

When I set the air flow to Defrost, it turns on the A/C?

On a 2001 Honda Civic. Having the temp dial to HOT. When I turn the air flow dial from FRONT to Defrost (windshield), it turns on the A/C button and the A/C motor kicks in also. It just started doing ...
4
votes
2answers
10k views

Honda Civic easily overheats with air conditioning on high?

I have a 2005 Honda Civic DX. I drove my car for about 10 minutes, with the air conditioning on the highest/coolest level. I then parked my car in direct sunlight for another 10 minutes, and kept the ...
4
votes
2answers
3k views

My vents randomly switch between face / windshield… how do I fix this?

I have a 1998 Ford Windstar (more details on demand if necessary.) I rarely use any vent setting besides "face", and I try to avoid using AC because my gas mileage is already lousy. About two months ...
4
votes
2answers
2k views

What's wrong with my intermittent air conditioner?

When the weather first starting getting warm last month, I turned on my A/C and it didn't work. The air coming out of the vents was warm and humid. A few days later it started working just fine and ...
4
votes
1answer
46 views

Mist coming out vent and water leaking under dash

When I turn on ac after a while a mist starts coming out and I have a leak under dash 💨 for about a month now. What can it be? Please help
4
votes
2answers
249 views

AC clutch engages but still no cold air

I've been reading for a week or so about how AC systems work and problems they could have. One consistent thing I've read is to check how the compressor clutch reacts when you turn on AC - if it ...
4
votes
2answers
2k views

Is it possible to charge car battery through cigar lighter socket?

I plan to modify my SUV into a camping car. Can I charge my car battery through cigar lighter socket with a 13.6 voltage when my engine is off? Also, can I power the air conditioning compressor and ...
4
votes
1answer
2k views

A/C Does Not Continuously Blow Cold

I have an '06 Chevrolet Silverado with a 5.3L L33 engine and 146k miles. I have been having issues with the A/C not continuously blowing cold air. It seems to cycle between cold and luke-warm. I have ...
4
votes
2answers
10k views

How do I convert a R12 to R134A for my AC system?

I have an older vehicle that has AC, but it needs a recharge. It uses the older R12 refrigerant and it is very expensive and can be difficult to locate as it is not made in the US anymore. How do I ...
4
votes
4answers
634 views

A/C does not cool when speeding more than 100kmph

I drive a 1.3 liter 2001 Mitsubishi Lancer. I have this weird problem with the a/c where it stops cooling when I try going above 100kmph. The a/c cools just fine under 100kmph. But when I go over ...
4
votes
3answers
3k views

Engine idles badly and loudly when I switch on the A/C

The engine of my 1984 Toyota Carina AA60 works great when idling without the air conditioner running, but immediately after switching it on, it idles very badly, and a big noise starts up. If I move ...
4
votes
1answer
270 views

1998 GMC Suburban Air Conditioner

I am a part time auto mechanic, and for the life of me cannot figure out this problem. No matter how many times I fix it, two weeks later it comes back. I cannot fix the air conditioner. I have ...