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1. there is an air bubble in the line. 2. the heater core it self is really dirty inside or it is blocked up. feel the hoses going to the heater core. one should be real hot the other just slitely cooler. if this is true then the core is good. the problem may be in the on/off controls. depending on the vechele, a control switch may be in the heater hose or in the heater core. the input hose is hot, the output hose cool. the switch may be stuck so it is blocking the water getting to the core. have some one watch the switch under the hood while some one is in the vechele working the switch on and off.

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โˆ™ 2005-01-25 22:20:40
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Q: What could cause the heater not to heat if you have changed the thermostat and it seems like there is no water getting to the core?
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