With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If they are both hot, the heat in that vehicle is controlled by a blend door that regulates heated air flow.
The door is controlled by a cable and may not be closing all the way.
There is a TSB on the issue but it is too large to post here. It may be available online.
BULLETIN NO: 53-12-04
DATE: May, 1995
SUBJECT:
HVAC System will not Heat Up or Cool Down Sufficiently (Adjust Temperature Control Cable)
MODELS:
1993-95 Chevrolet Camaro
1993-95 Pontiac Firebird
CONDITION
HVAC system may not heat up or cool down sufficiently.
CAUSE
The temperature control door may not be closing completely because the temperature control cable assembly may require replacement or adjustment.
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Sunday, December 7th, 2014 AT 8:13 AM
