Question about 1998 Chevrolet Blazer

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Air conditioner Everything in system under hood gets cold but cannot get cold air in cabin,only hot air. Has computer climate control.

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You need install freon gas.

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Why does airconditioner sound like its kicking on and off all the time even when its not on but heater and controls work fine

if you have a climate control system then that is what it will do as that system mixes hot air and cold air to keep the desired cabin temp

Mar 25, 2017 | Cars & Trucks

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Is there a place for fresh air entry into the cab of my truck

It passes through the cabin air filter then is either routed over coils to heat / cool / dehumidify the air and then through the duct system that feeds the vents in your car

systems usually consist of
  1. Evaporator
  2. Compressor
  3. Condenser
  4. Receiver/Drier
  5. Expansion device

Feb 11, 2016 | Cars & Trucks

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Why is my heater blowing cold

Most likely it is the heater control valve that shifts air from blowing across your heater core to your air conditioner core.

If your fan works and your car is fairly new..meaning your heater core isn't dirty and full of craap...then it is the climate cotrol valve.
If you are lucky, it might be a thermostat that is bad and blocking hot water from entering your heater core. Bottom line, if hot water doesn't circulate thru that little heater core, you won't get heat.
You might be able to look under the hood and grab the hot water lines that go thru the firewall and feed your heater core. If they feel cold to the touch after engine has warmed up, then you aren't getting circulating water to the heater core. If they feel nice and warm, then the heater core is fine, but your climate control valve has closed off the fan that blows across the core to disperse heat into the cabin

Feb 24, 2015 | Cars & Trucks

1 Answer

The a/c in my 2006 ford f150 lariat wont throw any cold air.The a/c pump kicks in .The line frosts up.The blower is working but it just blows hot air.The climate control seems to be switching everything...

Take a look under the dash at the heater/ac blend door(s) and cycle hot to cold on he dash heat control while asking for AC and the vehicle running.Do the doors move fully?
You may be able to manually help the door move to get cold air.

Feb 17, 2018 | 2006 Ford F-150

1 Answer

Air Conditioner on my 98 DeVille has been a little flacky for a long time. Sometimes would stop blowing throught A/C vents and instead blow through heater and defrost. After a few minutes it's alway gotten...

The paths through your climate system are controlled by blend & diversion doors that are controlled by your settings and actuated by vacuum 'motors.' If you live in a hot climate, you may have cracked vacuum hoses which can cause the kind of random air temp and mix you are having.
If you have never had any maintenance done that involves rubber products, it may be time to do it.

Jun 19, 2010 | 1998 Cadillac DeVille

1 Answer

Air conditioner on driver side blows hot air some times

Check the fuses that control the climate control system. If they are in good shape check the vacuum lines that control the system. GM vehicles usually have a black ball that the vacuum lines go into somewhere under the hood to control the system start there and check al the lines and controllers.

Aug 11, 2009 | 2005 GMC Yukon Xl Denali

1 Answer

Air doesn't come out front vents

look under your hood for any vaccuum leaks. check all rubber hoses under the hood. they should be roughly the size of your pinky.

Aug 08, 2009 | 2005 Ford Crown Victoria

1 Answer

1986 Mercedes 300e The air conditioner vents blow cold out of the center two and hot out of the two sides and the defroster vent. I tried to press the lower vents button and the high setting on the...

All the blend doors and vents are controlled by vauum. If you look in the rear firewall behind the brake master cylinder you will see a vacuum check valve with lines entering the cabin of the vehicle. The yellow colored ones are for your central locking,the green for a/c system, and red for your heater/water valve,clear for your source. Try isolating your vac. systems by unplugging lines and capping them off. Any leak in either system can adversly affect another system. So isolate your leak and then you will have to test your actuaters in the leaky system. If you unplug the red line and cap it off-the water will stop entering your heater core.

Jun 26, 2009 | 1994 Mercedes-Benz E-Class

1 Answer


The computer probably needs to be reset. there is a procedure for it somewhere but the quick easy way is to just disconnect the battery for a few minutes, This usually resets the computer and solves intermittant issues. Also, the air conditioning may be as simple as replacing the cabin air filter. My 2000 Lincontinental had the same issue only it would blow hot air. A local ripoff mechanic charged me 250.00 to look at the a/c after he cut a line into and had to replace it at my cost. he said I needed a new system for $1700.00. I walked away without using his "service" Later I checked the air cabin filter and found it was completely clogged. I replaced it for $30.00 and the air started blowing cold immediately. The cabin air filter is located under the hood. The plastic trim that is under the windshielf wipers has air channels in it. On the left side is where the cabin air filter is located. The best way to do it is to get someone else to change it at one of these quick lube places.

Jun 24, 2009 | 2000 Lincoln Continental

1 Answer

AC runs cold, then hot, then cold

this sounds like a defective air temperature control sensor, it is located behind the glove box, problem is the part is most likely no longer availiable from Ford..

Apr 01, 2009 | 1985 Lincoln Town Car

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