Heater core problem?
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Mountain Pass
Joined: Jan 2005
Posts: 109
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Heater core problem?
We got our first taste of fall weather in Houston this weekend, and with it I've discovered a new problem with my truck. After the engine was up to temp, I noticed that the heater would blow cold air any time I sat at idle. If you rev up the rpm's to 1500-2000, you can feel the air start to get warm again. I'm guessing this means my heater core needs to be backflushed, but wanted to see if anyone on here has other ideas.
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Mountain Pass
Joined: Jan 2005
Posts: 109
Likes: 3
Well, I'm embarrassed to admit it - the coolant tank didn't even have a level in it. I added what seems like a couple gallons of water, now the heater is blowing hot even at idle. To be honest, I cannot remember ever taking the cap off that tank, and I've had the truck 9 years. Obviously, I need to be paying better attention to the details. Will monitor it to see if I'm losing water or that was just depletion of the factory fill... 
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Mountain Pass
Joined: Jan 2005
Posts: 109
Likes: 3
Losing coolant due to head gasket leak
If anyone comes across this thread, just learn from my mistake - water doesn't normally get depleted from the system unless something is broken.
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