Question about 2002 Lincoln LS

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Overheating. New thermostat, Fan assembly and water pump and still overheats after driving at higher speeds then slow down to stop and go driving.

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You may still have some air in the system.
You may also check that your radiator fins are not clogged.

Posted on Oct 11, 2010

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Posted on Jan 02, 2017

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I v checked the cooling system, no leaks, new water pump, water pipes solid, changed cyl. head gasket, new radiator cap, checked water level, oil level, fan working, water circulating.


no car make or model mentioned so getting an answer is hit and miss
however what you describe indicates a fan drive problem so if it is electric fan cooled-- check the fans for full blade speed ( weak motor operation) or if viscous fan hub ( fan clutch) replace the viscous hub
it is all about moving air through the radiator when the vehicle speed is slow and the engine rpms are high
if the fan is not doing the job of pulling air through the radiator , the car will overheat
at highway speeds the ram action of the air flow virtually makes a fan useless as there is more than enough air passing through the radiator to cool the water
Im guessing here but I suspect that you have a viscous fan hub

Mar 27, 2017 | Cars & Trucks

1 Answer

2002 mercury cougar overheats at idle and when drove faster ik head gasket isnt blown, thermostat , water pump, relay, its been flushed out till clean idk whats wrong at all.


I suspect that if you do not have electric fan/s then the fan clutch or viscous fan hub has failed
indications are over heating at idle , stop lights , slow traffic, high rpms at slow speed but cools down as soon as there is enough road speed to put air through the radiator.

Sep 02, 2015 | Mercury Cars & Trucks

1 Answer

01 Audi tt quattro starts to overheat while idling but coils down after driving at higher speed, is it a thermostat or the fast relay switch


overheats at idle only are typically the fan system. Cars use the fan to pull air across the radiator for cooling. Any speed over 10 mph there is more than enough natural wind to do this without a fan. If the problem immediately goes away when you start moving, it is probably a malfunction or issue with the fan. I have on more than 1 occaision had a customer tell me they had the fan replaced and car was still overheating, and it ended up thje fan was spinning backwards or not turning on because of a fuse or relay issue.

If it doesnt cool down fully once speed is above 20mph for more than 30 seconds, there may be other issues like plugged radiator or weak water pump impellars. water pump is a fan that moves water instead of the air. if the blades wear, they still kinda work, but at idle they work poorly because the broken blades only move a little air at low speed, rev the engine up, they spin faster and work better. If the fan is functioning OK (Turns on and off by itself) and car still runs warmer at idle than at rev, water pump may be worth investigation.

May 08, 2015 | Audi Cars & Trucks

2 Answers

R reg toyota previa over heats. had new pressure cap n tested the head gasket so both of them are fine. is it likely to be the water pump? as its worse wen Im startin n stopping but seems fine wen Im...


It appears that you have a viscous fan hub driving the fan or should I say failing to drive the fan. The fix is to replace it . If you have electric fans then there is a problem in the temp sensor system and the fans are not cutting in on temperature The problem you state is indicated by the fact that when driving there is sufficient air through the radiator to remove the heat from the radiator ..but when driving slow there is no air flow because the fan is not drawing air through the radiator and the temperature climbs until over heat is reached . Typical indicators of fan speed problem is overheating at stop sign/lights, slow heavy traffic driving, slow up hill driving, and rapid cool down as road speed is increased , the faster the speed the cooler the motor

May 15, 2014 | Cars & Trucks

2 Answers

Filled Coolant reservior and radiator Drove trailblazer at highway speed no cooling problem. When slowed down in traffic temperature increased to about 220 and higher, could hear coolant bubbling in...


If there is bubbles occurring even inside the top part of the radiator (where you have the coolant put in), you may have a leak on your head gasket. You may be loosing coolant through the engine.

Sep 15, 2011 | 2004 Chevrolet TrailBlazer

2 Answers

2005 focus overheating at speeds greater than 45 mph. Does not overheat at idle. Gauge goes back to normal immediately when speed is reduced. Radiator, thermostat, coolant reservoir and sensor have...


Hi

It sounds like there is air in the system, also worth noteing that thermostas can be faulty at any time even when new so might be worth rechecking that, I remoe it and then place the thermostat in a pan of boiling water if you see it open easily then at least you can rule this out. also is the water temp sensor clean, or the part where it sits into the engine is that clean?

Finally the only other thing is air in the system, did you have the system bled through after the new parts where fitted? and the only other thing I can think of is the fan is starting to fail, they can overcharge at higher revs or at higher speeds so then the fan cuts out or slows down thus not creating the correct amount of cool air. you can test this with a amp meter, worth checking all connections also from and to the battery and the fan itself. It is quite common on fords this fan issue.

ohh there is one more thing, there is a heater control module that sits dierctly behind the dash board in the centre, you can see this from the engine bay again in the centre has 2 pipes one in and one out, this is for the cabin heating that feeds to the heater matrix, these alwyas fail and can cause the heated water to stop at the cabin end and return to the engine thus cauing overheating, this is rare that it would do this but it is just another possibility for you.

Hope this helps.
Regards

Dan. p.s I would check the fan first!!!

Dec 27, 2010 | Ford Focus Cars & Trucks

1 Answer

When idling my jeep overheats. The cooling fan is running and it speeds up when temperature goes up. The temperature gets close to 260 degrees and the engine tries to stall. when I start moving it cools...


At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.

Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.

If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?

It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.

Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.

Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..

The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.

Aug 14, 2010 | 2003 Jeep Grand Cherokee

2 Answers

1996 Jetta appears to overheat but no coolent loss


the temp sensor is the trigger for the fans!!
the thermostat may be in upside down??
check new thermostat in a pot of water & heat it up watch that it opens up when it heats up should be at aroun 96 degrees F
otherwise the radiator may need a good clean out or a recore!
there my be a blocked water gallery so engine may need a flush aswell
Cheers Rob

Aug 16, 2009 | 1996 Volkswagen Jetta

3 Answers

2004 kia optima overheating when in town driving. have to run heater for temperature to go back down. Shop told me the only thing wron is the drive belt and they couldn's get it to overheat. Eversince ive...


Classic signs of a bad water pump. When on the freeway, the circulation of coolant through the system is increased due to the speed but once you slow down, it will tend to overheat. Please post back with any other questions or just to rate the solution. Thanks very much!
Greg

Aug 10, 2009 | 2004 Kia Optima

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