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Bad Thermostat?

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Old 03-09-2008, 11:07 AM
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Bad Thermostat?

Ok, so last night my 89' stopped making heat. Basically, the temp gauge goes about 1/3-1/2 way up like usual, but the heater doesn't blow any heat. Is my thermostat shot and just staying open?
Old 03-09-2008, 11:18 AM
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the blower motor is blowing cold air?

Have you checked your heater core? possible blockage?
Old 03-09-2008, 11:29 AM
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Temp would'nt build as high with the tstat hung open usually anyhow. Could be the valve on the firewall not moving for one reason or another, colapsed hose,plugged core as stated before. Good luck Jim
Old 03-09-2008, 02:41 PM
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What's the best way to check for clogs in the heater core?

Oh, and yes, the blower motor blows cold air, sometimes luke warm.
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