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Old January 28th, 2006, 09:24 PM   #1
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Default Need Alittle help with heating

Well I have a 2000 Gmc Serria with the 5.3L. The heat went out on it so i put a New thurstate(SP) on and flushed and filled with new dexcol about 3 gallons to fill it.I'm sure all the air is out my temp of the engine is still the same all the time when driving 190-200. The only time the heat kicks out is above 1500 RPM other wise just ideling its cold air.

Also it any one knows a site for GMC owners could you post a link thanks
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Old January 29th, 2006, 11:35 AM   #2
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sounds like air
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Old January 30th, 2006, 02:18 PM   #3
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you could have a clogged heater core, or a vac line came off and the door won't open.
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Old January 30th, 2006, 04:18 PM   #4
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Yup, try checking the temps of the heater hoses first to see if they are hot or not at idle.
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Old January 31st, 2006, 02:40 PM   #5
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Default hi, just a note

from info given it sound like a possible vacuum leak in the heater assembly under the dash. i would definately check the inlet and outlet temps of the heater hoses. if near the same temo as the radiator then it's working fine with no clogs. second would look into vacuum lines if you are saying that you do get some heat at higher rpm's. i would guess that is your culprit. because ater higher rpm's the engine can create higher cfm of vacuum and overcome the possible slow sleak,

just a thought, hope everything turns out OK.
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Old January 31st, 2006, 09:49 PM   #6
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thanks every one for the help. for some reason to day it just started to work at idel kicking out heat like normal but i'm still going to check all the vac lines just to make sure
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