Question about 1999 GMC Suburban

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Replace my blower still I have no heat - 1999 GMC Suburban

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You may have a clogged heater core or a broken blend door motor. With the engine up to temp compare the temperature on both hoses coming out of the heater core in the engine compartment. The hoses should be about the same temp if coolant is flowing properly. If not then you may want to back flush the heater core. Otherwise you can suspect the blend door or its motor. see link below.

http://www.automotivehelper.com/topic574779.htm

I hope this is what you meant by "no heat". Or did you mean to say no blower operation?

Hope this helps

Posted on Dec 29, 2010

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This may seem silly, but it may possibly be the problem. Check your coolant levels. If there is not enough water in your cooling system, the heat won't be enough to warm you up. Be careful not to remove the radiator cap unless the engine is cooled down.
Other factors can be vacuum leaks in the doors that open and direct air flow to your climate control system. Can be the heater valve to the core is stuck closed. Hope this helps,
Best, Mark

Posted on Dec 29, 2010

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