2004 Chevy Silverado Heating Issue

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Old 11-29-06, 09:42 AM
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2004 Chevy Silverado Heating Issue

I have a 2004 Chevy Silverado Ext cab truck with the Larger V8, and automatic transmission. When the vehicle is idling the heater blows cold (cool) air, when driving or revving the engine the air heats up. I have 125k miles already. Any suggestions??
 
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Old 11-29-06, 04:12 PM
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That is a lot of miles, but not a lot of time. Too soon to have cracked vacuum lines, I would think. Has the system been flushed in that time. Not sure about '04, but my '00 did not have replaceable thermostat, came with the water pump. I understand newer models can be replaced. May be worth checking the actual operating temp.
 
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Old 11-30-06, 08:17 AM
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Flush

Yes I had the system flushed at about 100k miles. After searching the internet yesterday I Put some coolant in it and it is working better, but not the way it should. Now I quess I need to find out why I am loosing fluid?
 
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Old 11-30-06, 08:56 AM
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Check all your hoses, radiator cap, water pump, heater core for leaks. If nothing, check your oil. There should obviously be no coolant in there. I highly doubt you have a bad headgasket already. Did you try replacing the thermostat like Just Bill said? Alot of times the thermostat will not close or open correctly creating the condition you have, no heat.
 
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Old 11-30-06, 04:26 PM
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Has the water pump ever been replaced. they are prone to leak(mine went at 70K) in the same spot they did 50 yrs ago, at the shaft seal. There is a hole under the pump bearing/seal, it will leak there and run down the front of the block. May not be noticed with all the miles you rack up, since you never park.
 
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Old 12-05-06, 04:17 PM
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Thanks

Yes I have a (slow) leak in the water pump. The guys that change my oil said they noticed it months ago and thought I knew... So will have to replace and yes I have never noticed and leaking under car. So I quess they were right (oil change guys) about it being a slow leak. I always thought they would leak a very noticable amount like my 79 chevy did..lol anyway thanks for all the advice.
 
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