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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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#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)
#533 of 561 Re: Air in cooling system or head gasket problem? [nthompson1] by imidazol97 Jul 28, 2009 (6:05 am)
Replying to: nthompson1 (Jul 28, 2009 5:31 am) What motor do you have in the TranSport?
#534 of 561 Re: Air in cooling system or head gasket problem? [nthompson1] by Mr_Shiftright HOST Jul 28, 2009 (7:38 am)
Replying to: nthompson1 (Jul 28, 2009 5:31 am) No-- coolant doesn't have to be in the oil for a head gasket failure, although that is most common. But white smoke is a pretty good tip-off. You can also smell the coolant coming out of the exhaust. Best thing is a pressure test. Then you can pull a spark plug while the system is under pressure from the pressure pump, and look for coolant right on the plug. That's a sure way to know.
#535 of 561 Re: Air in cooling system or head gasket problem? [nthompson1] by obyone Jul 28, 2009 (3:09 pm)
Replying to: nthompson1 (Jul 28, 2009 5:31 am) An overheating motor is a sure cause for head gasket failure. Depending of course on how high the temperature peaked at.
#536 of 561 Electric Fan motor not turning off by oldmetal Aug 10, 2009 (11:35 am)
I have a 1999 lexus and the radiator fan motor will not shut off and drains my battery. Any help?? Thanks Replies to this message: kiawah (Aug 10, 2009 1:47 pm)
#537 of 561 Re: Electric Fan motor not turning off [oldmetal] by kiawah Aug 10, 2009 (1:47 pm)
Replying to: oldmetal (Aug 10, 2009 11:35 am) I don't have electrical schematics for your vehicle, but I would suspect the computer has inputs on engine temperature and vehicle speed and air conditioning on/off, and then when it senses it needs the fans on it turns on a fan relay(s).   You could have a defective relay which is burnt relay points, arc welded together. Without having electrical schematics and knowing it's draining the battery down, pull that relay while parked.

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