why does it keep overheating????
Moderator
Joined: Dec 2007
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From: Boise, Idaho
That's one way to do it. The other is to find the steepest incline you can and get the front end as high as you can get it, and then run the engine with the radiator cap off. That allows bubbles that are in high places to be lower, making them want to surface.
Lead Driver
Joined: Jul 2009
Posts: 6,477
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From: Sheffield, AL
Trying to think beyond the already given suggestions... do you still have your catalytic converter? You mentioned being down on power. Could it have been damaged when the engine overheated?
Are your v-belts properly adjusted? Have you recently replaced the fan? You mentioned having replaced the H2O pump, so I wondered if an incorrect one had been sold to you? The later model [fuel injected] pumps run "backwards" when compared to the carbureted engine ones. I would lean toward that except you indicated it was okay for a few weeks until you went mudding.
The brakes aren't dragging are they?
Oh well, food for thought!
Are your v-belts properly adjusted? Have you recently replaced the fan? You mentioned having replaced the H2O pump, so I wondered if an incorrect one had been sold to you? The later model [fuel injected] pumps run "backwards" when compared to the carbureted engine ones. I would lean toward that except you indicated it was okay for a few weeks until you went mudding.
The brakes aren't dragging are they?
Oh well, food for thought!
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Posting Guru
Joined: Jun 2009
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thanks.
the brakes are definately not dragging. Yes, it was okay for a while before I went mudding. this truck has seen quite a bit of mud and has not done this before. the belts are fine. the fan is engaging properly from what I can tell. I have no cat. I am wondering now, because the heater doesn't seem to get as hot as it should. bad heater core? do I need to flush some crud out of the cooling system? do these symptoms sound like a cracked head or block? I am kind of wondering about cracks because it doesn't seem to be a problem until after it's been running for about ten minutes. maybe a crack opening and/or closing as the engine heats up? how likely is it that I cracked something???
the brakes are definately not dragging. Yes, it was okay for a while before I went mudding. this truck has seen quite a bit of mud and has not done this before. the belts are fine. the fan is engaging properly from what I can tell. I have no cat. I am wondering now, because the heater doesn't seem to get as hot as it should. bad heater core? do I need to flush some crud out of the cooling system? do these symptoms sound like a cracked head or block? I am kind of wondering about cracks because it doesn't seem to be a problem until after it's been running for about ten minutes. maybe a crack opening and/or closing as the engine heats up? how likely is it that I cracked something???
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Posting Guru
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btw I did the thing with the open rad cap with the truck on a hill, so hopefully I got any and all air out of the system. it still got a bit hot when I drove it after that, not that hot, but I also didn't drive it that long. it did the heat sink thing again after the last drive where it got hotter after being shut off, but I also remember now that my truck used to do that back when it ran normal.
but yes I'm still worried.
somebody please tell me that at least my block/bottom end are all okay and the least I might possibly have to do is throw a head on the sucker. I hope these things really are as strong as they say they are. 
but yes I'm still worried.
somebody please tell me that at least my block/bottom end are all okay and the least I might possibly have to do is throw a head on the sucker. I hope these things really are as strong as they say they are.
Post Fiend
Joined: Dec 2007
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From: Lost
Sorry, I missed your last post....
Yes, the block is *usually* able to withstand getting a bit hot. The head is prone to cracking, if it gets too hot, and a head gasket can also fail from getting hot. The cracking is somewhat common, and the gasket failure is a bit less common.
Look for air bubbles in the coolant with the engine running at full warm temp.
Yes, the block is *usually* able to withstand getting a bit hot. The head is prone to cracking, if it gets too hot, and a head gasket can also fail from getting hot. The cracking is somewhat common, and the gasket failure is a bit less common.
Look for air bubbles in the coolant with the engine running at full warm temp.
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