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Discussion Starter · #1 ·
engine temp gets real hot and then all of a sudden it wll go back to normal, thermostat sticking? also, the coolant was low, but didnt notice anything leaking anywhere, hopefully its not mixing with my oil, any ideas
 

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Discussion Starter · #4 ·

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Discussion Starter · #6 ·
forgot to mention a slightly important item, one of my cats is rattling really bad so maybe an exhaust backup causing overheating? still doesnt explain the lost coolant though
 

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Discussion Starter · #8 ·

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Discussion Starter · #10 ·

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I had a similar problem it turned out to be the heater quick connect fitting on the intake, had a slow leak in it until it snapped off. Possible intake gasket???
 

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Discussion Starter · #12 ·
fanstatic
 

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Well I guess it depends on how much work you have done before. I say they are a bitch just because it can be time consuming.
 

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Discussion Starter · #15 ·
well, went out and looked at it closer, cant find any external leaks at all, the radiator was much lower than i thought, maybe a third of the way full. the inside of my oil filler neck was coated with some disgusting red slimy stuff. ive never seen what oil and coolant look like mixed but if i had to guess, that would have been it.

filled it up with coolant, im gonna drive it for a little while and see if more coolant decides to dissappear. if it does, i might just have someone do an engine rebuild for me, ive been battling noisey lifters and it has 215000 miles on it anyway.

edit: also, when i took off the oil filler cap, there was a little bit of smoke coming out of there, dont know what that means, coolant burning?
 

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The red slimy stuff in the oil filler tube is one of the indicators that you have leaking gaskets.
 

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Discussion Starter · #17 ·
The red slimy stuff in the oil filler tube is one of the indicators that you have leaking gaskets.
yea, thats what i figured :nono:
 

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Discussion Starter · #18 ·
just looked at it again and it seems like i have coolant playing hide and seek with me, i also found some nasty, yellow, sludge stuff on the inside of the oil filler neck, smelled like shit.

but when i check my oil with the dipstick, it doesnt seem milky to me, maybe because im looking at such a small amount?
 

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hey man I had the exact same problem with my 97 GMC vortec.. that red stuff in mine ended up being mud, I replaced my radiator, then thermastat, then engine tep. sensor, then intake gasket (looks like a cone or somethin like that), engine still ran hot.. finally I found out my water pump was shot.. I think if the coolant is smoking that you have mud clogged up in your radiator if you do any of that.. could be mixin with the oil too but my guess would be the radiator clogged...
 

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Do you do alot of short distance driving? I have actually found with mine that even after the intake gasket replacement if i am doing alot of short little jaunts not getting the oil up to operating temperature i will get some of that rust colored build-up on the inside of the oil fill cap. But then if i have been driving like 5 or more miles there will be nothing on the cap. I think it may just be water condensing in the tube from the oil not getting up to temperature before shutting the truck off.
 
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