over heating out of ideas
97 model with only 72000 miles I have replaced water pump, flushed the radiator, new hoses, replaced thremostat, fans operate properly in high and low speed. now i have removed the thermostat altogether. radiator is cool but motor is hot apears not to be circulating water from bottom radiator hose to top radiator hose. but i sprayed water through it and it blows out the top of the resevior. Please help. by the way no water in exhaust or oil. no signs of a blown head gaket. thanks in advance for any advise
|
RE: over heating out of ideas
Hey Rod67: Do you think it would be possible that you rad hose, upper or lower could be collapsing at higher engine rpm?? Deffinately sounds like a circulation problem. Does the rad core seem to be free of debris? ie bugs, fuzz, dirt. The next thing you could check is the timing , just to be sure it's not electrcal related. Hope this helps, Chow for now, Brougham1.
|
RE: over heating out of ideas
thanks hoses don't appear to be collapsing and radiator is free of debris, what is the suggested timing for this motor as i don't have the owners manual.
|
RE: over heating out of ideas
No timing adjustments are available on northstar engines.
Check the head bolts(tighten) to at least 45lb ft of torque. If they move then the threads have pulled in the block. By the symptoms you described that seems to be the most likely failure. |
RE: over heating out of ideas
thanks alot guys i will check that this afternoon
|
RE: over heating out of ideas
tried all these this. ready to run it in the river but to stubborn to quit. does this system have a valve of some sort to control the flow of water? still not circulating. help sorry about thetiming question was frustrated when typing. personally have never been able to get the a coil pack to turn with out breaking lol
|
RE: over heating out of ideas
FYI: flushing a radiator rarely fixes a clogged radiator.
Rodding out or replacing is the only way i know to ensure the core is flowing properly. |
RE: over heating out of ideas
thanks, have the radiator out taking it to get a bath at the local radiator shop. again thanks for any and all info.
|
RE: over heating out of ideas
still no fix. bumfuzzled[8D]
|
RE: over heating out of ideas
i'll bet its the head bolts.
If the radiator is clear through and you've checked the basics this is a somewhat common problem for the 96-99 northstar. |
RE: over heating out of ideas
bottom rad hoses collapse at high flow, air in the system creates pump cavitation, Dex-Cool gels blocks passages, hot exhaust leaking into cooling system boils coolant, stuck thermostats stop flow, backwards thermostats prevent flow, and the best ? water pump impelelrs installed BACKWARDS dont pump well - yes, the assy people do screw up. have you tried block & check? https://www.cadillacforum.com/m_7193/tm.htm ORIGINAL: rod67rsz 97 model with only 72000 miles I have replaced water pump, flushed the radiator, new hoses, replaced thremostat, fans operate properly in high and low speed. now i have removed the thermostat altogether. radiator is cool but motor is hot apears not to be circulating water from bottom radiator hose to top radiator hose. but i sprayed water through it and it blows out the top of the resevior. Please help. by the way no water in exhaust or oil. no signs of a blown head gaket. thanks in advance for any advise |
RE: over heating out of ideas
check your heater core hoses when your car is at operating temp. if one is much hotter than the other one your heater core is plugged. I had 1998 deville 4.6 that no one could solve the overheating problem in after changing water pump, radiator, thermostat, had it flushed it still over heated. everyone said it was more than likely the head gasket, but it wasn't using fluid. as my last resort I unhooked the lower heater core hose and bypassed the heater core to see if it would solve my problem, IT DID ! For some reason if the heater core is plugged it doesn't allow the coolant to circulate properly in the engine, causing it to overheat. You can bypass the heater core by removing both hoses off of the heater core and connecting them together with copper pipe or plastic coupler, it's the easiest way to see if it solves your problem, if it does then replace your heater core.
|
RE: over heating out of ideas
check your heater core hoses when your car is at operating temp. if one is much hotter than the other one your heater core is plugged. I had 1998 deville 4.6 that no one could solve the overheating problem in after changing water pump, radiator, thermostat, had it flushed it still over heated. everyone said it was more than likely the head gasket, but it wasn't using fluid. as my last resort I unhooked the lower heater core hose and bypassed the heater core to see if it would solve my problem, IT DID ! For some reason if the heater core is plugged it doesn't allow the coolant to circulate properly in the engine, causing it to overheat. You can bypass the heater core by removing both hoses off of the heater core and connecting them together with copper pipe or plastic coupler, it's the easiest way to see if it solves your problem, if it does then replace your heater core.
|
Disconnect surge tank purge line at tank and at thermostat housing. Clean both hose fittings and blow out purge rail. If clogged you will see a gloppy liquid come out. That was the problem for my 2000 Deville.
|
All times are GMT -5. The time now is 12:24 PM. |
© 2024 MH Sub I, LLC dba Internet Brands