Question about 1999 Chevrolet Prizm

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My a/c doesn't work. Only blows hot air. Also not working unless on high

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  • scottyd_01 Jul 07, 2010

    I have no idea how to fix

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  • Chevrolet Master
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Two fold answer ,firstly no gas in AC secondly the blower ?? needs a new reostat resistor

Posted on Jul 07, 2010

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2 Answers

Car wont blow hot air


Does it blow any air at all?

If it does, then check the operation of the valve, situated on the side of the heater matrix.
The heater matrix is in the centre of the vehicle, under the dash. Roughly behind where most car stereos are situated.
You'll have to remove any black, plastic shrouds to get to it.
Work the hot/cold setting and check the valve for movement.
If it is a motor actuated valve and in the even the valve doesn't move, then also check power to the motor.
If you have no power to the motor, or if the cable operated valve isn't moving then check the switch mechanism or wire/wiring.

Nov 12, 2012 | 2000 Mercury Cougar

1 Answer

What should i do when the hot air doesn't work


does the air not blow when it is turned to hot or does it blow but just not hot? If it blows but not hot you need to replace your thermostat and heater core which looks like a little radiator under your dash.

Jan 21, 2012 | 1998 Oldsmobile Silhouette

1 Answer

My 1999 Chevy Malibu runs hot? It started when it overheated. We changed the thermostat, then water pump, then temp sensor gauge and the temp gauge goes high but only when the heater stops blowing hot...


Air pockets will make the guage do that, and also cause your heat to come and go. Also, a poor radiator, as in rotting, or plugged up, will cause high temperature issues.

Sep 20, 2011 | 1999 Chevrolet Malibu

1 Answer

My a/c was working but hardley blowing so we put some of that free-on in a can that u buy at walmart and then it just started to blow out hot air. now it just doesn't blow out cold at all .


several things can make the a/c blow hot air. if the a/c was working but barely blowing then you may want to check for a clogged cabin air filter(it is behind the glove box in the a/c box). since the a/c is blowing hot all the time now, try releasing the freon out of the system or have it recovered into a recovery machine. you may have OVERCHARGED the system and the high pressure switch is keeping the compressor from working.the best thing to do is have the system pressures checked to see if the low side is 35-45 psi and the high side is175-225 psi with the compressor working. if the pressures are not within these parameters then there is another problem.

Aug 16, 2011 | 2006 Nissan Altima

1 Answer

My heater won't blow out any air unless it is on high with the fan blowing.


Hello let me verify.
1 heater wont blow out warm air unless on high?
possible clogged airfilter.low on coolant or antifreeze.

2 heater wont blow any air unless on high?
Could be a bad switch low ane med do not work.

Jan 14, 2010 | 2005 Jeep Grand Cherokee

2 Answers

Temperature gauge fluctuates and the heater blows cold air


Definitely check your fluid level in your radiator. Top it off all the way. I've seen that happen multiple times on cars that were low on anti-freeze. If that doesn't work try replacing your thermostat. It's cheap and the easiest place to start if topping off the fluid doesn't get you fixed up.

Oct 16, 2009 | 1997 Chevrolet Camaro

2 Answers

Air conditioner blows hot air inadvertantly.


possibl ac compressor clutch problem,cooling fan at rad not working so ac goes into high press mode and turns off(so it doesn,t blow system apart,built in safety)not enough r134 in system(low charge)

Sep 19, 2009 | 1997 Chrysler Concorde

1 Answer

Air conditioning blowing only highest setting but HOT air


Sounds like your freon has leaked out and your heater blower resistor is burned out. Deffinitly take this to the dealer.

May 20, 2009 | 2001 Honda Odyssey

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