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02-23-2008, 02:31 AM
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#1 |
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Registered User
Join Date: Dec 2006
Location: Edmonton, Alberta
Posts: 522
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04 Sierra Heating Problem
I have a 2004 GMC Sierra 4.8L 2wd ext cab pickup with 50k miles.
Recently, it has been taking longer and longer to heat up the interior. By the guage, the engine seems to be reaching full operating temp soon that it should be and yet I cannot get any heat out of the vents. Any thoughts? Could it be the thermostat? Anything electronic? Guage? Filter? Thanks in advance. |
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02-23-2008, 04:28 AM
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#2 |
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Registered User
Join Date: Jan 2008
Location: Groves,TX
Posts: 483
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Re: 04 Sierra Heating Problem
i would swap out the thermostat, its only a few dollers.
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02-23-2008, 04:46 AM
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#3 |
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Registered User
Join Date: Mar 2006
Location: Kansas
Posts: 865
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Re: 04 Sierra Heating Problem
If the engine is coming up to temp it won't be a thermostat. It would have to be in the selector between the hot and cold. a heater core plugging up, Or air locked.
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02-23-2008, 05:40 AM
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#4 |
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Registered User
Join Date: Dec 2006
Location: Edmonton, Alberta
Posts: 522
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Re: 04 Sierra Heating Problem
If the heater core is plugged / not circulating coolant, would this reduce/stop coolant from circulating through the engine as well?
That would explain the engine temp rising fast and no heat in the cab. |
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02-23-2008, 07:44 AM
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#5 |
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Registered User
Join Date: Mar 2006
Location: Kansas
Posts: 865
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Re: 04 Sierra Heating Problem
It wouldn't have much effect on the engine. All it could do is leave the heat in the cooling system/ engine instead of heating the air in the cab. Basically it would be like driving with the heater off to the engine.
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02-24-2008, 12:18 AM
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#6 |
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Blazerless
Join Date: Nov 2006
Location: Kelowna, BC, Canada
Posts: 274
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Re: 04 Sierra Heating Problem
Does the fan blow ok? Might be dirty cabin filters.
__________________
72' K5 Blazer 4x4 350TBI/700R4/NP205 3/4 ton diffs. Daily driver. SOLD  69' Beaumont 388/700R4 11.70@116  77' Bronco, Wife's mall cruiser/poser 4x4. Capable but too pretty to go offroad. |
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02-25-2008, 08:42 PM
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#7 |
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chrome makes it go FASTER!
Join Date: Feb 2007
Location: Cleveland Tennessee
Posts: 2,884
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Re: 04 Sierra Heating Problem
are you getting air out of the vents. If not it's the filter.
__________________
She can't cook and she won't clean. But she looks good in a skirt and she brings me beer. She can stay for now. EDIT:: But she left me anyway, So forget her. 1962 GMC Stepside V6 4 speed My rolling resto thread http://67-72chevytrucks.com/vboard/s...d.php?t=324226 My old farm truck http://67-72chevytrucks.com/vboard/s...=1#post3465005 |
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