Question about 1997 Lincoln Mark VIII

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97 lincoln mark 8 is overheating replace the thermostat still overheating. 100,000 miles coolant leak but hoses are fine. Where should I look now.

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  • jbb0166 Apr 09, 2011

    The car sat for 2 years when it overheated the first time it just shut down. The system has pressure cannot collapse the hose, the fan also turns on. Don't see any leaks but had to fill the coolant but not since then.

  • jbb0166 Apr 09, 2011

    The cross over tube is that next to the air filter on the passenger side front? Took cap off looks like a tire valve with coolant on top of it. When I shut the car off could hear gurgling from top hose of radiator



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'coolant leak but hoses are fine'...? If it has a leak, where is it coming from?

your possibilities for overheating are varied on a Mark viii, things to check are the coolant fan-does it come on when you let it idle for a long period of time, NO air conditioning on? If not, your VLCM (variable load control module) is bad, it is located next to the suspension compressor, passenger side fender under the intake filter. Check fuses and relays too, you might luck out and find it is just electrical. That fan takes a lot of juice (60 amps!) so make sure your electrical system is in good shape-even the 130 amp alternator you have is barely marginal, I have a 200 amp in mine, it is a good thing. Water pumps on these are easy to replace, one of the easiest I have ever seen, so consider it. Also a Cobra pump is a better alternative to the stock pump.

there may be air in the system, these cars are prone to this and have to be filled properly after servicing the cooling system-the front of the car should be a little higher than the back, and after filling the surge tank, remove the cap to the crossover tube (1/4" drive rachett) and start the car, let it run and fill at the crossover tube until it dribbles out of the top-screw on the cap, drive it, and if necessary, check it after it has fully cooled down to see that it has no air in it. Your surge cap may be defective, and people HAVE installed the thermostat upsidedown, so you may have to double check that. And, id you have a leak, it needs to be fixed-the system should hold pressure when it reaches operating temp, you can check this by squeezing the top radiator hose, it should be impossible to collapse. there's always the possibility of a blown head gasket, but it would run badly, smoke out the exhaust, you'd find oil in the coolant or coolant in the oil-hope that is not the problem, these are a pain to do since it is a DOHC engine.

Posted on Apr 09, 2011

  • mike mountain Apr 11, 2011

    the crossover tume is metal, just behind the alternator, it has a round cap with a 1/4" square hole in the top-this is where you need to fill it when cold.


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Purge system and check for leaks at the heater core ,maybe water pump is going out same thing happened to me turns out blades inside waterpump rusted away

Posted on Feb 19, 2012


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Overheating 97 Lincon Town car

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Car over heating and hoses springing leaks

Replace the radiator cap first (when it's cool and it's cheap). A coolig system needs pressure.

Next option is the thermostat. It is normally closed and will open at 180degrees (newer cars have higher temps). You can test by removing and then using your house stove and a pot of water see if the spring & valve open up as it gets near boiling. They are not very expensive either so it might be easier just to replace it as well. Make sure you run the heater at full to help get air out of the system.

If you check the oil and it looks high and weird then you could have a blown head gasket. This is much more $$$ to get fixed.

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I have a 1997 lincoln mark 8 replaced radiator water pump hoseses thermostat car still loses about a 1/4 gallon of coolant on a 120 mile trip compression is good no check engine lights no codes in system...

Friend, your only problem is a radiator cap that holds too much pressure and when hot enough will blow some coolant out. You'll never see it because it just dissipates from being hot. Swap out your radiator cap for a lower pressure one. I had to do this myself and the problem stopped.

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sounds to me that the engine thermostat has failed

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I have a 98 lincoln town car executive and I need to know how you change the thermostat

1. drain coolant
2. remove engine cover
3. remove the 2 bolts from water hose connection (upper rad hose connecting to)
4. remove o-ring and thermostat
5. repeat in reverse order

Feb 05, 2010 | 1998 Lincoln Continental

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Car is overheating

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.




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.

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Nov 16, 2009 | 2000 Lincoln LS

4 Answers


there is a coolant cap on the overflow bottle check it for seal
i'd just replace it
also if you put the new thermostat in backward the overheating would be significant

Apr 21, 2009 | 2000 Lincoln LS

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Idling high and running hot

did you change the thermostat? and it sounds like you have a vacuum leak that will make it idle high

Nov 09, 2008 | 2000 Dodge Durango

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58.5K miles - 2004 - car overheated on expy. Coolant Temp gauge went off the scale and motor died. Dealer analysis: valve broke & damaged sparkplug cyl & piston. overheated coolant damaged...


Whatever the reason for the engine siezing, it will be to your advantage to replace the radiator as debris may already be blocking a number of the lines.

As to the overheating, the most likely reason is a failed water pump (most likely), or a thermostat stuck closed (least likely), or a coolant leak (noticeable). Since engine would be replaced, the water pump and thermostat would also be replaced and the leak would be verified upon installation of the new engine.

Incidentally, I was made to understand that Hyundai warranties their drivetrain for 10 years or 100,000 miles. I believe the engine is a part of the overall drivetrain system.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jul 29, 2008 | Hyundai Elantra Cars & Trucks

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