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My lincoln ls V8 sport overheats when the heater is off but works fine when the heater is on. My lincoln with the heat off while on the highway will not overheat but soon as I get off the highway on to town streets the fan will kick on high and the car will not overheat all the way but it would. Be over the flag until I turn the heat on low............. help

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  • Cars & Trucks Master
  • 2,002 Answers

This means your cooling system is not working properly. First check your coolant level, this is the most common cause of overheating. Top it up if necessary and watch it for the next few days, refilling when necessary.Take a water hose or air hose and clean out the cooling fins on your radiator, paying close attention to the lower rad. Quite often they get plugged with debris and will imair your cooling ability. Blow out from the engine side, this way you are going against the flow and it should clean easier. Next, let it heat up and watch to see if the cooling fans come on. There are a set of temp sensors to turn them on and off so this problem will likely need to be sorted out by a mechanic. It could also be that your cooling system is partially blocked, which would suggest that a flushing is in order.

Posted on Oct 20, 2013

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: 2000 lincoln ls heater not working...thermostat?

- If temp guage reads normal, the lack of heat may be due to the Heater Control Valve. Located in front of the radiator. Lower passenger side. A real bugger to replace.
- The plastic cap just over the thermostat is key in re-filling the anti freeze and bleeding air.

Posted on Dec 25, 2008

oldfishead
  • 155 Answers

SOURCE: Why is it overheating?

Sorry but its common for this year to have a hyd cooling fan motor to go bad along with the coolant degas tank breaking...you'll need ford pn# XW4Z-8K621-AA motor and a # 388898S washer to replace, along with the degas tank..don't forget p/s fluid to refill the system...BESURE you totally PURGE the cooling or it will O/Heat in 2 blocks ....hope this helps you...GL

Posted on Jul 08, 2009

  • 641 Answers

SOURCE: 2002 Lincoln LS, V6 overheats

Did you purge the air out of the syst.? Also you replaced the fan but are they coming on? have you checked the fuses and relays? if all this is ok then is the computer comanding it on? Is the computer getting correct info from Eng coolant temp. snsr (ECT)

Posted on Aug 02, 2009

Mustgo
  • 2359 Answers

SOURCE: my lincoln ls 2001 overheat

Check for air pocket in coolant system.

===
When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!


Posted on Dec 05, 2009

Kravcar
  • 192 Answers

SOURCE: 98 deville 32 valve North Star OVERHEATS after 33

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.
If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.
The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

Posted on Jul 17, 2010

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- The plastic cap just over the thermostat is key in re-filling the anti freeze and bleeding air.

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