Heater blows likewarm air at idle, When i accelerate the air gets hotter back to idle it gets cooler

2002 CHEVROLET SUBURBAN
145,000 MILES
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MICXIE
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Checked the heater hoses [Both are hot]
fan does not go into high speed
Temperture gage takes a while to go to operating Temp. Falls down a little at idle.
Feb 11, 2012 at 6:11 PM
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RASMATAZ
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Check the air blend door/actuator-could also be the water pump impeller
Feb 11, 2012 at 6:14 PM
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MICXIE
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Thanks for the comeback Rasmataz, If it was the water pump impeller would'nt it overheat at idle? How do i check the air blend door/actuator? It dose'nt overheat at idle. Could it be the thermestat? Im only guessing.
Feb 11, 2012 at 7:28 PM
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RASMATAZ
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Start by checking the thermostat
Feb 11, 2012 at 10:49 PM
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MICXIE
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Thanks again Rasmataz Soon as the weather warms a bit Ill change the thermostat.
Feb 12, 2012 at 9:35 AM