Question about 1999 Oldsmobile Alero

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Heater not working

1996bsuburban front ,rear heater frot works great back blows cold air
what is wrong?

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The back is usually for air conditioning only i have a 94 and thats the way its made with air control in back heat up front.you might look more closely and see if this isnt the case

Posted on Jan 14, 2009

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Posted on Jan 02, 2017

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Buy used parts at car-part.com. Look on page with * to find the cheapest part. Coud be your temp blend door (#2) may not be moving back and forth. Or, you are not getting hot water to the rear heater core.

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You may have to crawl under the truck and feel the heater hoses to see if they are hot. You will find a group of 4 lines, 2 for heater and 2 for a/c. If hot, you know hot water is getting back to the heater core. If not, there may be a hot water vave that's not working. Not sure if EXP. has a water valve for rear.

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