Question about 1997 Pontiac Grand Prix

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Ac control switich heater

The heater is not working

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Need to replace the actuator.

Posted on Nov 25, 2013

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My heater isn't working..how do i fix it?


Here's a list of possible culprits:

Priority Action Part Type Cause
1 Inspect - Antifreeze Needed - Coolant Level Low.
2 Inspect - Heater Control Valve - Leaking or Faulty Heater Control Valve.
3 Inspect - Thermostat - Thermostat Stuck Open.

First thing to check is your engine coolant level - quick and free.
Since your blower works, my nominee for the offending part would be the Heater Control Valve, which redirects hot coolant into the passenger compartment heater core. Without hot coolant, the blower will just blow cold air, since the heater core isn't getting the needed flow of hot coolant through it.
There may also be a fault in the "Temperature Valve Actuators" (there is a right hand and a left hand version of these - one for each side of the car).
The Right hand Temperature Valve Actuator is AC Delco part #15-72971.
The Left hand Temperature Valve Actuator is AC Delco part #15-72972.
Their pictures are available in the online AC Delco Parts Catalog at:
http://parts-catalog.acdelco.com/catalog/catalog_search.php
Here are your parts search parameters:
Vehicle: 1996 OLDSMOBILE AURORA V8-244ci 4.0L F/I Vin C ID# 17739
Group / Subgroup: Heating/AC / Heater Core and Htr Control Vlv

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My 97 buick lesabre limited heater/ac blower quit, it has the climate control,I checked all fuses.


REMOVE HEATER BLOWER MOTOR HOT WIRE BLOWER MOTOR IT.IF IT WORKS.YOUR AC AND HEATER CONTROL SWITCH IS FAULTY.CHECK HVAC FUSES AND CHECK BLOWER MOTOR RELAY.IF BLOWER MOTOR DONT WORK WHEN HOT WIRE REPLACE IT.IF ALL CHECK OUT GOOD.HAVE DEALERSHIP DO A DIAGNOSTIC TEST ON YOUR CLIMATE CONTROL SYSTEM.

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Heater core and ac working @ same time


they always are on at the same time, the air temperature control blend door controls the outlet temp. It is broken or the electric motor that moves it is boken or both are defective which is the usual case,.

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Ac and heater not working. New Heater core and


You need to but a scanner on the computer and activate the AC. If it does not activate you may have a bad PCM. Also if the pressure in the AC is low it will not run. Also you have a AC relay in the engine fuse box.

Now for the bummer part. I have this same truck. Replaced heater core and I didnt get the blend door quite on track and it jammed. I had to take the dash off again. Also your center heat control may be bad.

I don't think these two problems are related. Even without AC your heat should work. Do you have rear climate control also. See if that works. If it does you may have a jammed door for the dash area

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2000 Dodge Caravan Sport. Heater and AC quit working.


these heater control units were in a bad spot..cup holder right below..coffee spills have been known to get in control unit..can be expensive to replace..try a wrecking yard

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