My car heater stopped working

Asked by Lmiranda2017 Oct 14, 2019 at 11:08 PM about the 2005 Buick Rendezvous

Question type: Maintenance & Repair

Recently my check engine light came on so we ran the
codes and it was for an o2 sensor bank 1 sensor one,well
around the same time we noticed the heat stopped working
in the car. The o2 has been fighting ed and I am told the
heat issue could be 1 of 3 things but how do you know if it's
the heater blower ,thermostat or resistor?

1 Answer

89,515

You find out by doing diagnostics. 1. If the blower isn't working, could be motor itself, or a blown fuse/relay, dead resistor, faulty switch..... 2. If the blower works and you have no heat, check radiator coolant level. Really low coolant can prevent it from heating the core properly; a failed thermostat will act similarly. An air bubble in a heater line can block fluid passage..... 3. If these are OK, the ductwork has blend doors that move to get the temperature to the vent where you want it. Could be that the blend door that throttles between hot/cold is sticking because the door actuator is defective. You may have noticed a tapping sound under the dash from a defective actuator.

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