Question about 1996 Dodge Caravan

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Air conditioning - a/c fans don't come on, compressor makes squeals, air is not cold.

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The Air-conditioning needs to be re-gassed. Take the car to an Auto Mechanic to get the Air-Conditioning re-gassed. They might also need to check it for leaks to make sure the gas stays in.

Posted on Jul 26, 2009

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How can I figure out what's squealing? Where can I find belt diagrams?


I had something similar with two seperate vehicles after replacing everything I could think of it turned out to be a bad bearing in my alternator on both vehicles.

Aug 04, 2014 | 2005 Hyundai Elantra GLS

3 Answers

Air Conditioning


you don`t say how you checked the level, as you need an a/c gauge to check pressures. you could still be low on Freon. you could have an expansion valve problem, poor air flow over the condenser or even a a/c compressor problem.

Jun 10, 2014 | 1995 Mitsubishi Mirage

1 Answer

My 2004 pontiac vibeblows only hot air when i turn on the air conditioning its like the heat is o n really hot air like you got the heat on


check and make sure the a/c compressor is turning on when the a/c is turned on. if it is then make sure the cooling fan comes on, if the compressor is not working then you may have a faulty low pressure switch, you can unplug the electrical connector and test the harness side of the connector by jumping the 2 terminals using a paper clip to see if the compressor turns on. if the cooling fan is not turning on it will cause the a/c system to not operate to reduce the chance of the vehicle overheating when the a/c is turned on. hope this helps

Sep 08, 2012 | 2004 Pontiac Vibe

1 Answer

My ac is only cold when I am driving, my heat is only hot when I am driving, not getting cold air or hot air in idle position?


So many mechanics, so little consensus. Sounds pretty common.
I can't say as to why hot and cold only when moving, but it sounds like a weak performing system.
As for the squealing, I would suggest removing one belt at a time, and see if one eliminates the squeal. That would be the problem belt or pulley or component. Also, if you have any idler pulleys (a stand-alone pulley) on the belt system, be sure and check them as well. Spin them without the belt on, and see if they make any noise.
It would seem you need a mechanic who is willing to spend some time with you on this to find the problem. When you find a good one, you will know it by his output, and make yourself a regular customer. Good luck.

Mar 24, 2012 | 2005 Hyundai Elantra

2 Answers

The AC on my 2002 chevy S 10 just suddenly stopped blowing cold air. The freon is full and the compressor is coming on. Any advice would be helpful in this Texas heat. Thanks


If the freon is full and the compressor clutch is working,is the blower working, need more details, if it is, you could have a blocked orifice filter. or a bad high pressure switch located at the rear of the compressor.if the high pressure switch loses voltage or goes out, your cool air will come to a dead halt. check the high pressure switch for voltage. good luck!

Aug 08, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

Air conditioning not too cold ??


Hello,
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Let me explain in layman's terms how the air conditioning (AC) system works and what could be happening to your car.

Like your body, the air conditioning compressor is the heart of the AC system, and Freon is the blood. The compressor pumps Freon throughout the AC system, either the older type R12 which costs as much as gold it seems these days, or the new environmentally-friendly R134A Freon. This Freon is a gas and liquid combination that is compressed and circulated throughout the air conditioning system. The compressed Freon is pushed through the system under pressure and is passed through different sized metal and rubber hoses and a special valve called an expansion valve that cause the gas to expand and contract.

This expansion and contraction makes the Freon gas very cold. This cold gas makes its way via metal lines into the dash area of your vehicle to the evaporator core. This evaporator core is like a small radiator, except it has cold Freon circulating inside and not hot antifreeze. A small fan (the AC blower fan which you control from the control panel on the dash) sits in front of the evaporator core and blows air across this cold evaporator and then through the vents inside your vehicle.

The other objective of the air conditioning system is to remove the heat from inside the cab of the vehicle. This heat is removed by the Freon with the help of the AC condenser located at the front of the car (usually in front of the radiator). The Freon coming back from the evaporator carries the heat from the cab to the condenser via rubber and metal hoses. Just like your radiator, the condenser is lightweight aluminum with many internal winding coils.
The Freon travels through these coils, and in between these coils are small slits or fins that the Freon is forced through. The condenser will have an electric cooling fan mounted in front or behind it to push or pull air through these fins to remove the heat from the Freon. Some vehicles still use the old fashioned fan blade driven by the engine to pull air across the radiator and the condenser.
Now I know that is just a tidbit of information on how the air conditioning system works, and it is very general, but I wanted you to know what to look for to give you insight as to what might be happening with your vehicle.
A few causes of low cooling efficiency or no cooling at all at idle are:

Lack of air flow across the condenser. Make sure the electric cooling fan motor near the condenser is coming on, or in models that are equipped with a fan blade make sure this fan is turning and is turning very fast.

Low Freon levels. Freon level and pressure should be checked by your certified air conditioning mechanic.

Overheating. If the engine is running hot or overheating, it can have a noticeable negative affect on the air conditioning system. Some cars have two electric cooling fans, one for the air conditioning condenser and the other for the radiator. Make sure they are both working properly. Usually at idle on a hot day with the AC on both fans will be on.

When the vehicle is traveling at freeway speeds, the compressor is pumping the Freon throughout the system much faster and harder than at idle. There is a dramatic increase in air flow across the condenser due to 55 mph winds, and the engine is usually operating at a cooler, more efficient temperature as well, thus allowing the air conditioning system to operate efficiently.
Note: An air conditioning system that is somewhat low on Freon can still feel comfortable at freeway speeds due to the added air flow across the condenser which can overcome the ill effects of slightly low Freon. Periodic air conditioning performance checks by your mechanic are the best way to keep the system in great shape.

Hope this helps.

Goodluck

Oct 08, 2010 | 1998 Cadillac DeVille

1 Answer

2009 toyota sienna, a/c doesn't work. i have lready replaced the compressor,clutch,relay, expansion valve and drier....still not working....even the toyota dealership her in las vegas is puzzled why it...


does the fan blow air in the cab i know its not cold but it is air? does the air lines compressor sweat? it may be the air conditioning button in the car where turn ac on off is not sending signal to compressor to turn on compressor and check the air ducts make sure they routing the air correctly to the cab check to make sure a ac system is not over charged if it is over charged will not send out cold air use a tire gauge should be around 40 psi i believe but check with dealer make sure my psi is correct hope this helps if dont fix repost and think somemore ideas

Sep 15, 2010 | 2004 Toyota Sienna

3 Answers

When I start my car it squeals really loud and smells like a vaccuum belt is burning. it also overheats while sitting still unless the air conditioner is on and now won't pass emissions. what could be...


Your squeal sounds like you have a pulley frozen, or sticking, that the belt can't turn, and it will burn. You need to determine which pulley or idler pulley it is.
The cooling problem may be related (water pump) , or just a failing fan switch, or fan. See if you have two, as some vehicles have one, and a second for air conditioning.

Dec 09, 2009 | 2000 Mitsubishi Eclipse

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