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GMC Forum: 1999 sierra heater
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Old 01-17-2013, 05:27 PM
Cflood Cflood is offline
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Default 1999 sierra heater

My heater wont blow out hot air it blows air just not hot the air gets a tiny but warm but not much how can i get it to blow hotter
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Old 01-17-2013, 06:17 PM
Molson02536 Molson02536 is offline
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Originally Posted by Cflood View Post
My heater wont blow out hot air it blows air just not hot the air gets a tiny but warm but not much how can i get it to blow hotter
Start with the simple and check your radiator fluid, if your fluid is very low. You will not get any heat at all though your heater core and will end up with a blown motor.

Once the level has been checked and is full, check the temperature of your heater hoses. The inlet should be hot and the return slightly colder, if there warm and about the same temperature. Good chance your thermostat is stuck open and your coolant is cycling through your radiator more then your heater core.

The last issue would be your heater actuator, here is a link that hope will help you.

Keep us posted and god luck.

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