why my heater dosen't work

Asked by Jan 20, 2007 at 05:00 PM about the 1997 Chevrolet Blazer 4 Door LT

Question type: Maintenance & Repair

heater works when first cranked and sitting still then when you drive it becomes cold what is the problem

1 Answer

20,780

Hey JP ... Have you noticed how the temperature of the engine relates? Given the information you've given us here the first place I would look is the thermostat. After that you need to check the hoses leading to the heater core and the core itself. The fact it works at times still leads me to the thermostat however. I would also take a ride the library and see if they have the Chilton's for your model year. There will be a heating troubleshooting guide in it that will guide you towards the problem. Good luck!

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