Question about 1989 Chevrolet Suburban

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No heat in 93 Suburban

I have a 454 93' Suburban and no heat. I replaced the heater core, have plenty of coolant level, the fan blows good and strong. The thermostate reading is normal. Why is there no heat coming through the heat and defrost system?

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  • terry_fike Dec 17, 2008



    thank you very much. I'll check it out first thing in the morning. Hope that's all it is.

  • Rico  Smith
    Rico Smith Dec 24, 2008

    I have the same problem on a 1999 chevy suburban 5.7. New heater core, water pump, heads, all gaskets, the blend door is working, control valve is working, but no heat. someone please help.

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  • 153 Answers

There is a valve that allows heated water to flow through the heater core when you select heat on your controls. This valve should be located under the hood and one of your heater hoses should run to it. Your valve is stuck or failed for some reason. Check it out.

Posted on Dec 17, 2008

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If you haven't already, try replacing the thermostat located on your engine's intake at the upper radiator hose. If that doesn't work, it may be in the control pannel for your heat on your dashboard, causing the heat switcher in your air box not to switch. Also check the cable on the air box, as sometimes when you do a heater core the cable may not be exactly back in place, or it may have been bent.
Hope this helps
Good luck

Dec 17, 2008 | 1989 Chevrolet Suburban

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