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Discussion Starter · #1 ·
ok, I've got an 89 burban, a crane cam in the 350, new radiator, and new 195 thermostat, and radiator cap. when I put the jeep on the trailer and take a hill the thing gets hot, and drops fairly fast after hitting the top, it only gets this hot when towing this kind of a load, I can run all day long with the air on and a hot day with no problem, just when pulling and hills, the thing has sufficient power to do the hills but the heat just keeps rising, so I'm thinking its either a water pump issue, but not sure, or the stock big ass catilitic converter, but on that line, it is a 3" exhaust, so even a restricted one would flow better than a 2.5 one maybe?
 

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Have you thought about using an electric fan as a pusher for more airflow on the hills? Sounds like you have everything else covered. <IMG SRC="smilies/biggrin.gif" border="0">
 

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Discussion Starter · #3 ·
well, I took out the manual fan and put in an electric fan out of a 5.0 t-bird or something, its a 19" electric fan and does well with the cooling end of things, better than the manual fan did, but they bolth suck when towing hills.

I could be wrong, but the cat is original with 200k+ miles on it, and dosen't look all that sound, so I think I'll replace it tonight, and we'll see how it does then.
 

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200k+ on a cat!!!! that thing is definatly dead. That might help some but don't think it would be a huge issue but you will definatly see a good deal of new power if you upgrade to an aftermarket 3" converter.
 

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the cat might be plugged-up from debris from
itself. But I'm not sure this would be a part
of your overheat issue, but rather a loss of
power issue. The 195 thermostat sounds inline, but maybe try a 165 unit instead.
free-flowing exhaust is good. (sidenote):
a freind of mine with a brand new Chevy
Astrovan 4.3 motor pulled the stock exhaust
off and installed a new flowmaster unit.
He instantly lost like 3-4 mpg.... He thinks
the increased exhaust flow is not allowing the cat to burn off the spent exhaust and
the O2 sensor is screwing up the computer.

is your burb an auto-trans? you might be
just needing to downshift a little bit to
help it out...

I dunno, I'm rambling cause it monday....

Sherpa
 

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Discussion Starter · #6 ·
the o2 sensor is before the converter, so that woulden't affect the mileage, but a plugged converter will affect mileage, and possibly heating up, the tranny has just been rebuilt, and is working great, and the new HD torque converter seems great to, and I'm not hearing any pinging on the timing side of things and its set where it should be, I diden't have this problem before the cam but I was only flat towing the jeep then and it diden't have the nards to pull the hills then either, another thing may be to much antifreeze, maybe I'll drain some and add water and some redline water wetter, I don't know.
 
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