Well First off I'd replace thermostate, while your at it drain and flush radiator. Also if the Heater still continues to blow cold that could mean a bad heater core which can be a pain to replace. An option is to bypass the heater core by taking the two hoses off and coupling them together. I had overheating issues and no heat, did the following and haven't had any issues yet. One downfall is no heater in the winter, being the lazy man I bought a power inverter and space heater to keep my car warm, hey it works
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18 years ago