GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

heat issues...

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Old Jan 22, 2012 | 12:40 AM
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Thumbs down heat issues...

hey guys ive been havin some heat issues and with the weather lately here in illinois its been pretty brutal...a while back i swapped a 160 t-stat in the truck...drove it all throughout summer then when winter came around heat sucked...drained the dexcool and flushed the whole system and reallty flushed the heater core which was clogged...now heats great but the issue is with my fan speed...its like it doesnt push hard, 1 and 2 barely work and even on 5 with recirculated it still doesnt push like it should, just feels extremely weak. am i looking at a blower motor problem? resistor or switch? blower motor is quiet, no noises or clicking...just weak fan speed. any help would be greatley appreciated

thanks

tj
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Old Jan 22, 2012 | 01:15 AM
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Originally Posted by lukn4trbl355
hey guys ive been havin some heat issues and with the weather lately here in illinois its been pretty brutal...a while back i swapped a 160 t-stat in the truck...drove it all throughout summer then when winter came around heat sucked...drained the dexcool and flushed the whole system and reallty flushed the heater core which was clogged...now heats great but the issue is with my fan speed...its like it doesnt push hard, 1 and 2 barely work and even on 5 with recirculated it still doesnt push like it should, just feels extremely weak. am i looking at a blower motor problem? resistor or switch? blower motor is quiet, no noises or clicking...just weak fan speed. any help would be greatley appreciated

thanks

tj
I have all of your exact issues, except I havent flushed my heater core so I hardly have any heat either most of the time. Sometimes it blows warm.
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Old Jan 22, 2012 | 01:38 AM
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Check your cabin air filter. (unless your truck is non-a/c)
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Old Jan 22, 2012 | 01:53 AM
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Originally Posted by AKlowriderZ71
Check your cabin air filter. (unless your truck is non-a/c)
You think a cabin air filter would be so dirty as to make level 5 fan speed feel like 1?
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Old Jan 22, 2012 | 02:22 AM
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I've seen some pretty ugly ones. Pretty sure the recommended service interval is every 15000 miles.
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Old Jan 22, 2012 | 08:28 AM
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Yup definitly could happen. Also, I know the heater boxes are quite different but I had a dodge the other day that the fan output was horrible on. Pulled the blower and the recirc door was broken and blocking the incoming air to the fan.
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Old Jan 22, 2012 | 12:47 PM
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a low dime, definitley try flushin it man...helped me a lot, occasionally id get heat just like you said...not i always have heat,now that i do the truck wants to be a turd and not push it. as for the cabin air filter, ill definitley check that out. dumb question but is that located behind the glovebox like most cars? or in a different place?
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Old Jan 22, 2012 | 12:54 PM
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You've got to removed the bottom trim cover to get to it. It comes out the bottom.
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Old Jan 22, 2012 | 01:00 PM
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alright thanks alot man, 01 is a 2pc filter also right? and livefast i really hope that didnt happen lol...otherwise looks like my heat might have to stay this way for a while, i got a really limited amount of dough i can spend at the moment lol
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Old Jan 22, 2012 | 01:25 PM
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Just changed mine, made quite a difference in power. $16 after taxes. Now I need to fix my heat. Top radiator hose is hot, lower is luke warm at best. Heater hose on passenger side was barely luke warm, the hose closest to drivers side was hot to touch.
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