Question about 2004 Chevrolet Suburban

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Heat blowing cold air in 2004 chevrolet suburban

Turn the thermostat to 80 and it still won't get warm. Any ideas?.

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With coolant full and engine hot,make sure both heater hoses are hot. If not replace thermostat. If they are, check the blend door for proper operation. Otherwise you may have a bad climate control module. Check both front & rear units.

Posted on Jan 27, 2009

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My 2005 Suburban only blows hot air when accelerating.


does it ever overheat? (waterpump or thermostat)

Possible clog in heater core or pinched heater hose under hood.

If coolant/water is at proper level, and you don't over heat, the later will most likely be the issue.

Heater core is small radiator deep inside under the front passenger dash and is rather hard to access.

If you smell something like coolant inside, this is for sure the issue.

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