GerryVetteC4

Hi ... new to the forum appreciate in advance the help ..

Problem: since replacing the heater, i only get heat when automatic thermostat dial is set at max. A/C works fine. Any ideas ?

thanks again ... Gerry .. Boerne, Texas

GerryVetteC4

C4 is a '94 ... forgot that ...

Cliff Harris

Run the HVAC diagnostics and see if anything comes up:

AHaze

Odds are the temp sensor for the HVAC system is bad. I've had the same problem with a few GM trucks.