Question about 2000 Pontiac Grand Prix

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I set the ac at cold but it blowa hot, what is wrong?

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Take the car to a shop that does a/c repairs
Can't guess at vehicle issues without the car to test

Posted on Jul 09, 2013


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Posted on Jan 02, 2017


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1 Answer

When i select cold air, hot air is blown instead. When i select cold air with the AC, it is cold,and AC with hot air it is hot.

The thermostat controls the discharge temperature by using the compressor to cool and mixing hot water from the engine to match the setting. When you select AC, it enables the compressor to run from the thermostat. Else, only outdoor air is available.

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Feont heat works but rear heat just blowa cold air.

There must be a way to control rear heat and its turned down to cold. The vents are tied together but to seperate thermostats.

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Ac won't work

large leak in system, faulty low pressure switch, a/c clutch faulty, a/c compressor faulty, system clogged, fuse blown, wiring faulty. orifice tube clogged, too much air in system. read more here:

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Well Doug in Mesa AZ, sounds like you've got a AC control module malfunction. Tell you what, if you want to troubleshoot it yourself, Go to and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.
If you don't want to fix it yourself, Take your vehicle to an authorized Hyundai dealership and pay the diagnostic fee... they will tell you exactly what the problem is and the cost of parts/labor to fix it... at least this way you'll know what the problem is and what's required to fix it.

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AC blows cold or hot

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2 Answers

Ac blows hot air ac compressor is ice cold but the vents blow hot air when enige is hot. bloows cold air when engine is cold

check your air diverter doors, sounds like the door for heat is open, when a/c is selected the doors should move and close the heater off. the heater will over power the a/c. the door controller is located on the environmental station under the dash neat to the floor. the control is electronic and probably not functioning

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3 Answers

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This works on a chevy.. But try un hooking the battery cable for 30 seconds and re connecting.. Make sure Radio is off B4 disconecting

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