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cumminspatrol

overheating issue

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i have a 66 patrol with the 4bt,compounds hx30/hx50 40psi,4"side dump exhaust,3200gsk,minor pump mods,sm 465/np205,dana 60/dana 70 with 3.07 gears.also a aluminum radiator measureing 27"x15"x2.25".intercooler in front of radiator.also have two 7"electric fans and one 10" electric fan.my temp will gradually climb over 200 in amost any extended driving condition.any grade will cause it to overheat quickly.even cruising @50 mph no incline it will keep creeping over 200. all fandsare working and turning the proper direction,the temp gauge is correct,ive replaced the thermostat,ive taken the thermostat out,fluids are all fresh,air pasage ways are unabstructed through radiator.

the radiator was used when i bought it and installed it.the overheating issue has been an issue since day one.im ready to try a new radiator but would like some suggestions before i fork up the money and effort to do so.thanks in advance.andy

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I'd give this a try to make sure that your cooling system is good and flushed. The citric acid cooling system flush is a Mercedes Benz service procedure. I did it on my Benz and it runs noticeably cooler than before. I can't see that it wouldn't do anything but help on ANY cooling system.

Let me know if you need some citric acid, I have enough for another flush.

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Here is another thought... air bubble in the system?? The Mercedes temp gauge shot up right after I flushed it. Freaked me out. Did some research and figured out how to BURP my cooling system.

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have you checked it to see if it's building pressure in the cooling system? aka head gasket failure? just a thought

:cool:Thats a good idea. pressure test the cooling system,,:think:H/G,, you do have twins and i know how hard it is for me to keep my foot out of it sometimes.

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Here is another thought... air bubble in the system?? The Mercedes temp gauge shot up right after I flushed it. Freaked me out. Did some research and figured out how to BURP my cooling system.

Sounds like he has drove it far enough that there should not be a bubble in it. Before I would replace that radiator I would take it to a radiator shop and let them clean it out. And you sure your fans are pulling not pushing right?

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my fans are spinning the correct way,i havnt checked for radiator pressure but i havnt seen any other signs of a blown head gasket.and i dont think the head gasket should have blown at those boost levels.40psi is the highest it has ever seen 2 or 3 times.i have been told my lower radiator hose could be colapsing while driving because there is no spring inside.looking into the radiator it doesnt look corroded or anything.my gauge is working perfectly or i assume my cap wouldnt be spitting fluids above 200.i havnt had the space in the shop to work on it latley but im going to implement some of the ideas suggested here and would like more suggestions to consider as well.thanks for the help

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Well what I would do is this. Pull your thermostat and then see if it heats up if it does then you know it isn't that. Also another thing I don't know if that is the same water pump as a 6bt but I have herd of some people having trouble with the water pump impeller sliding off the shaft. Another thing is are you running the same belt set up that it had before?? I have also seen the belt be changed around and that will spin the water pump back wards.

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My dad had overheating issues on his 97 454 burb for a while, radiator looked like it was new.. .As a last resort he swapped the radiator, no issues since. So that is a thought..

Flush it, if that doesn't work then replace...

Is that the biggest radiator you can fit?

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Well what I would do is this. Pull your thermostat and then see if it heats up if it does then you know it isn't that. Also another thing I don't know if that is the same water pump as a 6bt but I have herd of some people having trouble with the water pump impeller sliding off the shaft. Another thing is are you running the same belt set up that it had before?? I have also seen the belt be changed around and that will spin the water pump back wards.

i have replaced my thermostat,and removed it as my original post stated.i know my pump is turning the right way because i can see coolant circulating through the radiator. i didnt have any issues with overheating when it was in the step van.so i can only assume the problem lies with something i changed. the radiator i have installed is the largest i can fit with my current setup.

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i have replaced my thermostat,and removed it as my original post stated.i know my pump is turning the right way because i can see coolant circulating through the radiator. i didnt have any issues with overheating when it was in the step van.so i can only assume the problem lies with something i changed. the radiator i have installed is the largest i can fit with my current setup.

Same one as in the Van???

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Based on what you said above I would look at your fans if they are s blade fans the blades are reversible and still apear to be correct even though they are not.

the water pump if turning backwards could still give the effect of circulation but not enough if backwards

does the upper hose ever get hot?

have you pulled the pump to verify the impeller is still intact

I have seen impellers completely rusted and or broken in half

I personaly check the pump I know your "sure its good" but Ive had stuff stump me before that didnt make a bit of sense

JACK

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Based on what you said above I would look at your fans if they are s blade fans the blades are reversible and still apear to be correct even though they are not.

the water pump if turning backwards could still give the effect of circulation but not enough if backwards

does the upper hose ever get hot?

have you pulled the pump to verify the impeller is still intact

I have seen impellers completely rusted and or broken in half

I personaly check the pump I know your "sure its good" but Ive had stuff stump me before that didnt make a bit of sense

JACK

fans are working properly.i have phisically put my hand behind them and they are in fact moving air the correct way.is there a way the pump would be turning backward if i havnt messed with the pump since it was working well in the doner vehicle?i havnt pulled the pump or inspected it.it would be very unlikley but not impossible for a pump to go bad in the process of a motor swap.i am not using the original radiator ,but a used alluminum radiator pulled from a v8 jeep in unknown condition.

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how many rows is the radiator it may not be sufficient flow I would pull the radiator and have a reputable radiator shop look at it a good radiator guy should be able to tell you if it is suficient or if it is congested do you have any pics of your radiator setup you can get some pretty good deals on aluminum radiators from jegs in about any configuration with plenty of flow I realy would like to see some pictures of the radiator if you can

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