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Buick Park Avenue Heater Core

Q. Dear Sir, I have a 1991 Buick Park Avenue. I'm having problems with my heater blowing warm air. I changed the thermostat and that didn't help. I was going to back flush the heater core, but a friend said that they have a by pass valve and if the heater core is plugged, it wont do any good to back flush it. Any suggestions?

Thank you, for your time,

Buick Park Avenue Heater Core

A. I don't see any reason for it to not help. Don't recall any bypass valve here. Hey What have you got to loose? Just make sure that you purge all the air out of the cooling system. Any trapped air could restrict flow through the core too.

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