I have a Mazda 626 year 2001 my car overheats with the heat on but it runs at normal temp with the air on?

Asked by Jul 07, 2015 at 07:30 AM about the 2001 Mazda 626 ES

Question type: Maintenance & Repair

1 Answer

65,315

If it runs normal temperature with the A/C on, this tells me the electric engine cooling fan is operating properly in A/C mode. The overheating in heater mode makes me think there is a problem with a temperature sender or fan control unit. When the engine gets to a certain temperature in heat mode the electric fan should come on. When you are in the A/C mode the fan will run all of the time.

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