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Re: I agree with Jim
Posted by Sjer [Email] (more from Sjer) on Sat, 28 Jul 2001 13:33:38
In Reply to: Re: '91 9000 Cooling Problems, Jim Kane, Sat, 28 Jul 2001 12:46:54
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If you're overheating with the fan running, it could be one of several things:
1) fan is not running fast enough because of resistor fault- not likely the cause because the high speed should kick in and prevent overheating
2) something is wrong with the gauge or coolant sensor- seems unlikely
3) inadequate flow through the block/radiator- probably the problem
4) a radiator that is so badly fouled inside and out that it cannot achieve the required heat removal.. not likely unless it has been abused.
Could be the water pump, MAJOR blockage (only thing I can think of besides the thermostat is a broken radiator flange where the upper hose is clamped on). Another thing that could cause this is if you replaced the OEM heater hoses with larger size hoses, resulting in most of the pump flow going through the heater core.
This sounds crazy, but disconnect the radiator hose and then the heater hose (one at a time) to check for adequate flow. This will be easy to do if you have a flush tee installed in the heater hose- you will know what flow to expect. If the radiator hose flow is the only low flow, then you can't blame the water pump.
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