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2001 Chevrolet Blazer Question: I have no heat

 

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tlemper, Palm Coast, FL, December 10, 2013, 06:48
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The ac works fine and there is no leak in the heater core

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    December 10, 2013, 08:21
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     Master

    Have you ever removed that red 'crap' it came from GM with called Dex-Cool?

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    tlemper, December 10, 2013, 08:25
     Rookie

    Yes I have replaced the Dexcool. I have heard this stuff will settle in the lowest point and solidify.

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    pushrod, December 10, 2013, 08:29
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     Master

    Possible stuck open thermostat, low coolant level, heater controls or restricted heater core. Replace t-stat first thing anytime there is a heating/cooling problem with the engine which also affects hvac systems.

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    tlemper, December 10, 2013, 08:32
     Rookie

    I have done all of the recommended except replacing the core., I am about to use air pressure to blow out any clog.

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    pushrod, December 10, 2013, 08:53
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     Master

    If it is restricted, i have good luck with air and water together with a rig i made up. Try the air, cant hurt.

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    tlemper, December 13, 2013, 07:40
     Rookie

    I ran water through it. It flowed fine in one direction but not the other.
    I was wondering it there is some find of check valve in the system that would
    prevent the flow in one direction?

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    pushrod, December 13, 2013, 07:47
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     Master

    Not that i am aware of. Hook hoses back up, refill rad run until hot and see if both heater hoses get hot. Post results.

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    tlemper, December 13, 2013, 09:16
     Rookie

    I ran the motor to running temp. The big radiator hose was to
    hot to touch but both the heater hoses were barely warm. I had no problem holding
    Them in my hands. I held them close to the firewall.
    addendum : I ran the air pressure up to 100 lbs. It blew out something,
    Because I now have heat. Thanks tor the support.
    Tim

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