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Cooling Systems -- Problems & Solutions (Radiator, Fan, etc)

561 messages,  Last post on Nov 12, 2009 at 1:37 PM

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#523 of 561 cooling fan by nelsonv2001 Apr 28, 2009 (4:27 pm)
have a 92 saab 900.. the cooling fan is not operating.. could be a sensor, however the air conditioning fan right next to the cooling fan does work... is this sufficient to cool the radiator until I can resolve the problem with the cooling fan? Replies to this message: kiawah (Apr 28, 2009 5:43 pm) Mr_Shiftright (Apr 28, 2009 5:50 pm)
#524 of 561 Re: cooling fan [nelsonv2001] by kiawah Apr 28, 2009 (5:43 pm)
Replying to: nelsonv2001 (Apr 28, 2009 4:27 pm) probably depends on where you live, the outside temperature, and how much stop and go traffic you do vs....highway driving.
#525 of 561 Re: cooling fan [nelsonv2001] by Mr_Shiftright HOST Apr 28, 2009 (5:50 pm)
Replying to: nelsonv2001 (Apr 28, 2009 4:27 pm) Like kiawah said.....also you might try disconnecting the wire from the AC compressor clutch temporarily so that you don't have the drag of the AC heating up the engine (which is why they allow the AC to bypass the sensors and turn on the fan in the first place). Only thing I don't know is if disconnecting the AC clutch wire would defeat this bypass system or not. Worth a shot---might give the AC cooling fan a better chance of keeping the engine cool.   Whatever you do, don't overheat that Saab engine. Those cylinder heads bend easily. Head gaskets are a big problem on a 900, especially a turbo.
#526 of 561 Re: Coolant "weeping" is normal - more info. [Mr_Shiftright] by laraann May 06, 2009 (8:39 am)
Replying to: Mr_Shiftright (Feb 10, 2008 9:17 am) hi i was just wondering if anyone had ruled out your heater core. i had a cadi and the heater core became clogged and stopped heating after manually flushing the system it worked fine for a while then clogged again this did not affect my cooling of the engine but if yours would be clogged and leaking down in the firewall or in the car under carpet. also another thought is are your fans working if they are not working than you will overheat when driving in heavy traffic at slow speeds or while you are stopped this can evaporate your antifreeze with time .also hoses that are bad can cause circulation problems as well. wish you the best of luck . and a little note change the oil in your car due to the high temperature it will cause the oil to break down faster .
#527 of 561 BMW X-5 3.0 2001 -cracked coolat expansion tank by yobinot May 29, 2009 (10:49 am)
My car overheated and cracked the coolant expansion tank. What causes this tank to cracked and any idea of what i need to replace besides the tank.
#528 of 561 2004 Pontaic Sunfire by partssource Jun 20, 2009 (8:31 am)
Coolent fan not coming on. Cars temp went up to 260 and no fan I belive this should work from a sensor though the on board compurter but not sure of wher the sensor may be radatior intake head Ext nor Am I sure how to test it once I do find it can any one help Replies to this message: kiawah (Jun 20, 2009 11:37 am)
#529 of 561 Re: 2004 Pontaic Sunfire [partssource] by kiawah Jun 20, 2009 (11:37 am)
Replying to: partssource (Jun 20, 2009 8:31 am) I don't have electrical schematics for your vehicle, but you may have a relay that gets turned on, which then powers the fan motor.   You should also check out the fan motor itself.   Disconnect the fan motor from the harness, and check whether there is voltage on the harness with a voltmeter. If no voltage, you problem is 'upstream' of that harness. If there is power at the harness, then likely the fan motor is bad. You should be able to apply 12 volts directly to the fan motor to check it out.
#530 of 561 Question about water pump tests by listerine Jun 28, 2009 (1:16 pm)
If the radiator hoses stiffen after the car is started, can it be assumed that the water pump is working and coolant is being pumped through the system? Or is that simply an indication that the system has pressurized?   While I'm curious about those signs in general, I'm also wondering if they're still valid for the vehicle in question: blown head gasket (and consequently exhaust fumes are bubbling the coolant overflow), no leakage from the water pump, and only the top radiator hose seems to get warm. Replies to this message: kiawah (Jun 28, 2009 2:54 pm)
#531 of 561 Re: Question about water pump tests [listerine] by kiawah Jun 28, 2009 (2:54 pm)
Replying to: listerine (Jun 28, 2009 1:16 pm) The system is pressurized, is no indication of waterpump status. The system would normally pressurize as the temperature warms up. If it pressurizes right away after starting, that's a head gasket problem. That and the bubbling, two telltale symptoms.
#532 of 561 Air in cooling system or head gasket problem? by nthompson1 Jul 28, 2009 (5:31 am)
After having had installed new radiator/cap, thermostat, coolant, etc., engine still overheats. The new radiator cap only turns tight once; the old one said to align arrows with cooling tube(turned twice, one pushed down hard). Any suggestions on correct burping procedure? White smoke comes out the exhaust; mechanic says this means blown head gasket. I thought that with a blown head gasket, the coolant went into the oil(this is not happening). With the new radiator, etc.,, I am not losing any noticable amount from the overflow or radiator. If it was the head gasket, wouldnt I be losing coolant? The manual says to fill radiator to neck of radiator. I am wondering if filling to the top(by myself and mechanics, etc.) is causing air problems. Vehicle is 1997 Pontiac Trans Sport. I definitely got ripped off(cracked plastic radiator end) from seller. But I have met many more wonderful people, including those on this forum. 99% of people are good. Thank you, Replies to this message: imidazol97 (Jul 28, 2009 6:05 am) Mr_Shiftright (Jul 28, 2009 7:38 am) obyone (Jul 28, 2009 3:09 pm)

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