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walkingtall
Street Queen
Posts:102
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| 10/25/2006 7:19 PM |
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| hello When I was coming home from work i noticed that the heater in my 98 blazer was not working right, it would blow really hot air out for about 10 seconds then it would blow cool air out for about 5 secs it did this the whole way from work about half hour what do you think is wrong with it or do you have any ideas |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 10/25/2006 9:11 PM |
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The most likely cause of your problem is that your window is rolled down.
Just kidding...
Seriously though - it sounds like the air duct baffles are opening and closing. I *think* in '98, they are controlled with an electric motor, but I could be wrong and they are controlled by a vacuum switch. Either way, the fresh air / heated air duct baffle is likely opening and closing, and you should be able to fix it relatively easy.
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
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'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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walkingtall
Street Queen
Posts:102
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| 10/25/2006 9:31 PM |
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| now that i think about it the window was down, no for real can you tell me how you fix it |
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ChevyMan0784
Lift & Lockers
Posts:699
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| 10/25/2006 11:50 PM |
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| Also,the same thing can happen when you are low on antifreeze/coolant. It ends up getting an air pocket thus the cool spots. But the fins opening and closing is a valid point. there may be a short somewhere in the heater/ac wiring harness, or even switch. |
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gimmie fuel gimmie fire gimmie that which I desire-James Hetfield
*Never give an Irish man good cause for revenge.
*Guns dont kill people, but they sure help!!
*98% OF AMERICANS SAY 'OH S**t' BEFORE GOING IN THE DITCH ON A ICEY ROAD.
THE OTHER 2% ARE FROM ALASKA, AND THEY SAY, 'HOLD MY BEER AND WATCH THIS |
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SnoMan
Lift & Lockers
Posts:943
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| 10/26/2006 5:10 PM |
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quote:
Originally posted by ChevyMan0784
Also,the same thing can happen when you are low on antifreeze/coolant. It ends up getting an air pocket thus the cool spots. But the fins opening and closing is a valid point. there may be a short somewhere in the heater/ac wiring harness, or even switch.
This was kinda true with older engines but the way the coolat is routed on the VorTec 350, it is not likely to happen. It would have to be REALLY low on coolant |
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