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Sticking thermostat could cause this. If the thermostat is stuck open, it never gives the engine a chance to fully heat the coolant. Follow the top radiator hose to the engine, remove the hose and remove what it hooks to and there's your thermostat.

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โˆ™ 2008-12-08 23:21:49
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Q: Your 1997 SC1 Saturn heater works but does not blow hot enough what could be wrong?
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