Mazda Repair Questions? Ask Mechanics for Answers ASAP
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1991 Mazda what?
How is the thermostat?
I see, thanks. Do both of the heater hoses feel hot after running for a while?
Sometimes it hard to tell if the temp door actuator is working. Does it seem to change any when going from hot to cold? (like get colder)
That could just be a bad actuator for the temp door but you may want to try flushing the heater core with a garden hose and blow some shop air through it first. It's more common for the heater core to become plugged up after the system has been opened up.
The actuator is on top center of the heater box, about 3 hours book time. There is a test for it but you have to get at it to test, thanks.