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Chevy Blazer
Heater Cores and Blower Fans
Chevy Blazer S-10

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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Wiki User
2005-01-25 22:20:40
2005-01-25 22:20:40

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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Most common things are Thermostat or a bad heater core but could also be something blocking the door down by the heater core. I changed my Thermostat and Heater control Valve to find out a pencil fell in the defroster and prevented the door from closing. Hope this helps.

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By overheating which will cause a change in the thermostat materials construction.

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A blocked heater hose could cause a leak. A stopped up heater core could as well. Or the connector in the Windstar could be cracked.


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