Question about 2001 Chevrolet Blazer

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No heat How can I tell if my water pump is working? No heat in the car.I checked the water in hose going to the heater core and it was empty and I just replaced the thermostat.

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  • bass_guy01 Mar 09, 2009

    I have some heat but it's not kicking out as much as it should. I have the fan turned up full blast and hardly any heat is coming out.

  • blueextc3221
    blueextc3221 May 11, 2010

    if your water pump is not working, your car will overheat.

    That is the simplest method.

    Another method is to check the return line hose after it reaches operating temp.

    A cold return hose means the engine is not circulating coolant.

    Before blaming the water pump - have the system flushed 2-3 times to remove any sediment taht may be stopping it from spinning, and/or clogging up the heater core.



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If the engine is not running hot then the pump is working. If the hose going to the heater core is not hot whenever the engine is at normal operating temp then the more likely solution is an obstruction. The best way to clear this is to dissconnect both the hoses going to the core at the firewall, then take a waterhose with nozzle attached and apply the pressure to one hose then the other. This should fix it.

Posted on Mar 03, 2009


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