Question about 1989 Chevrolet Suburban

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No heat in 93, 454 heater

I have no heat coming from my heater, fan is on good and strong, I replaced the heater core, I have plenty of coolant level, no heat in defrost mode either. What's wrong?

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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

Posted on Dec 17, 2008

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It is likely that the heater core has sprung a leak, or the hoses leading to the heater core have failed. This would cause a loss of coolant that would make the coolant temperature sensor think it wasn't necessary to turn the fan on, and would cause steam to appear to rise out of the back of the engine. If you turn the heater on inside the passenger compartment and get steam through the vents, it's DEFINITELY a heater core breach. Otherwise, check the hoses leading to the heater core and make sure they are still connected and not leaking. Good luck!

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If the heater core is not damaged or leaking ie: if you don't see coolant on the INSIDE of your windshield or coolant on the floor inside the car then chances are you may just need to BLEED the radiator.

remove radiator cap

Fill coolant resovoir to the cold line if the engine is cold from sitting overnight.

Start engine with cap off

Wait till engine gets hot

While waiting you will see a big gurgle of air bubbles come out and the coolant level will drop

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When the fans come on and it stops gurgling air install the radiator cap

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Watch the coolant level for the next few days and top off in the resovoir as needed to keep it filled.

Your heat should be very hot now providing you installed the correct oem thermostat correctly.

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