Posted: Fri Jan 12, 2018 12:00 pm Post subject: 2003 heater/ blower issue
I have a 2003 Impala and I'm having problems with the heater/fan. When i put it on defrost, the front window is (eventually) defrosted but the air is not very warm (i can feel the air though). when i turn the controls to the heat setting i get no heat or even air flow. I can hear the fan, though, regardless of whether i run it at low or high. There is no change to engine temperature.
It seems i should do as follows (in this order) to troubleshoot the problem: 1. check the coolant levels. 2. replace the thermostat. 3. replace the blower motor resistor. 4. replace the blower motor.
Sounds like you are getting air flow. So if you start the car, let it warm up to operating temp. Check the coolant gauge, should be next to the spedo. With the car running open the hood and step over to the driver side. There should be a coolant hose kind of near the driver headlight. Grap it to feel how hot it is. This should be a reference for you. Next, there will be 2 hoses near the firewall about say 3/4 of an inch wide, that go into the fire wall. Grab both of those hoses, they should both be nearly as hot or warm as the coolant hose you just touched near the drivers light. If one is cold you have a restricted heater core. If they are both hot, then you most likely have a blend door or temp door actuator that is not working.
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