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Re: Lack of heat (should be unrelated to blower motor)
The thermostat is in the line going into the heater core. If the heater core is plugged up you aren't going to get a flow of coolant through the stat. There are 2 rubber hoses running into the heater core. Take the hoses loose from the heater core at the firewall. Take a garden hose and flush the heater core both ways. I think this will solve the lukewarm heater and the low heat register on the temp. gauge.
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