Question about 2003 Chevrolet S-10

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What causes my AC to kick on when I turn the heater or the defroster on?

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The AC does kick on in the defroster postion or half defroster half heater. This is due to the dehumidifying effect of the AC. moisture condenses on the AC coil in the heater box and exits the car through a drain hole. This speeds up the defogging process. This is completely normal.

Posted on Nov 06, 2010

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Why wont my ac or heater come on in my 2003 chevy impala,but the defroster it work on defrost only when i turn it to the heat position, but not on ac mode.


Check the actuator motor on the heater. It moves the arms that directs the doors to switch from heat to ac. and to defrosters.

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I have a 2004 chevy silverado 1500,and when all my switches are all turned off ac heater defroster inside there is hot air still coming out of my vents inside the truck and I have the vents all shut off...


there is a diverter door in the heater box that allows outside air to enter the cab this door can stick open when you change from defrost to ac you should hear this door flip directions

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2007 Suzuki Forenza ac/heater/defrost fan not working


the cab heater fan?, there can be 4 fans on some cars.
front condenser, 2 on rad, and 1 in cab heater box.
the cab fan? does it fail on high too?
it has a switch, (marked fan speed)
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1 Answer

When I turn my heater and defroster on, a bad smell starts and the windows fog up but the air is hot.


This may be due to a bad heater core or dirty core with a plugged water drain, first see if the a/c works. turn it on and see if the air gets cold and if the ac compressor works.

The way the defrost works to keep windows from fogging up is that when the front defroster is tuned on the ac should also be on, on most cars when you go to defrost it will turn ac on automatic. the system then uses hot and cold air to remove the moisture in the air to avoid window fogging. if your a/c is not working then that may cause window to fog, but if you are also getting a smell then the drain that lets out condensation may be plugged and then water builds up and also mold from always being wet and when heat is on you smell that.


i want you to run the defrost and when windows fog up wipe window with hand and see if it is greasy . if it feels oily then you may have a bad heater core, the core leaks coolant out and steam and causing windows to fog up with a flim of grease.

Feb 03, 2013 | 2000 Chevrolet Silverado

1 Answer

No fan operation on867819221 ac


It can be issue with relay or wiring of the fan causing the problem.
Check the help links.Click the link below:---
A/C, heater, defroster fan, not working? http://technoanswers.blogspot.in/2012/02/ac-heater-defroster-fan-not-working.html

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Heater AC or defroster fan not working on KIA? http://technoanswers.blogspot.in/2012/02/heater-ac-or-defroster-fan-not-working.html

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Where is A/C CONDENSER FAN MOTOR RELAY Located? http://repairhelpcenter.blogspot.com/2011/11/where-is-ac-condenser-fan-motor-relay.html

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How to Remove Fan Clutch ?


http://technoanswers.blogspot.in/2012/04/how-to-remove-fan-clutch-on-2005-gmc.html

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This will help.
Thanks.

Jul 17, 2012 | Cars & Trucks

1 Answer

The air only blows out only on defrost on my 91 chevy truck


air blows out only defrost possible cause could be faulty ac and heater mode switch or broken vacuum line to ac and heater vacuum actuator.you have to remove ac and heater control switch to check it out.

Dec 05, 2011 | 1991 Chevrolet C1500

1 Answer

I have a 1999 Grand Voyager. Whenever it rains, the serpentine belt comes off. What's the problem and solution?


Ok..that is a strange one.. I am going to hazard a guess and suggest you look to the AC compressor.

When you run the defroster the ac compressor comes on..typically whenever the outside temp is above 40 degrees.. the ac compressor kicks in to dry out air inside.

Often when it rains.. the windows fog.. you turn on the defrost.. the ac compressor tries to come on.. and.. there ya go.. rather there your serpentine belt goes.

Several things could cause this.. worn belt.. failing belt tension-er... or failing ac compressor..

If the ac compressor is frozen meaing it will not turn..when the electric clutch on the front engages.. it would cause the pulley to stop turning.. and the belt would have a hard time staying on a non rotating part.

Or if the belt tension-er is bad..or the belt is worn.. when the additional load of the compressor kicks in.. it jumps off.

Finally it could be a combination of all three..


Best of luck..

Apr 04, 2011 | 1999 Plymouth Grand Voyager

1 Answer

Water leaking coming down over four wheel drive unit


the condensation from the ac canister there is a little spout that comes out of the fire wall and when you use your ac or defrost the ac compresser will kick in to take out the moister in the air when using the defrost setting, the water or condensation that builds on the inside will drain out of the spout and thats probly what your seeing either that or u have a bad heater core.

Dec 04, 2010 | 1998 Chevrolet Blazer

1 Answer

Hot air blows when system turned to heat, when control is moved to Defraost or combination heat/defrost air temp cools down, what could cause this?


Make sure you have the heat selection set all the way to heat. In Ford and Dodge vehicles, when you select Defrost the AC compressor actually kicks in and if you have the temperature selection set to the cool side it will push cold air to defrost your windshield.

Oct 09, 2010 | 1998 Ford Taurus

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