Question about 1993 Lincoln Mark VIII

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Temp guage runs in the red! 93 mark VIII 135K miles

I have replaced all in the cooling system. rad, thermo, pump, send unit. The water temp is good/normal. However the guage says its hot... When the needle gets in the danger zone the computer sends messages to check system & will open up the heater as a safety back up canceling the air conditioner. Not good on a hot day.... The only thing left is a bad guage. I have doubts. when its cold/winter the temp guage runs a little above normal although not in the extreme. Now that the outside temp is in the 70 the guage reads in the red after about 20 minutes of steady driving.

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Has the water pump been changed recently? The water pump on a 4.6L 2v and 4.6L 4v look the same but are different

Posted on Apr 21, 2009

  • Anthony Peterson Jul 22, 2014

    Antifreeze overflow or air vacuum will cause other problems....may b too late for valves, lifters and cam shaft. Ususally goes first from excess heat.

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1995 Lincoln Mark VIII OVERHEATING after 2 thermostat s in a week.?


You need to find an honest Joe!! My first thought is get the rad checked. Any good mech would know how. It should be hot at the top half and cooler below, but even spread across the whole rad. You don't say if its forcing water from the header tank? If it is then its possible a head gasket has gone. If its been maintained but the coolant hasn't been flushed and replaced every 2 years then its likely the main rad is partially blocked. There is no ready cure for this despite a lot of additives and theories, the only sure way is to replace the rad. Is there no good DIY neighbour who could help? I understand your fears about some dealers but if in doubt take your DIY neighbour with you so they will behave.

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Temp guage climbs to high nml then a minute later it drops back to low nml


air lock in the cooling system get a plastic bottle cut the bottom off turn upside down put on radiator filler and run engine cut full off water wait until all air bubbles stop then remove and put cap on see how that goes

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I have a 2000 Saturn sl 1.9L sohc. My cooling fan is not coming on. I replaced the temperature sending, which did read a temperature on my instrument cluster, before and after replacement. If I have the...


first, is/was the temp guage showing over heating? If so you should have checked/ replaced the fan temperature switch on the radiator ( or follow the fan wiring to it's location) depending on air temp, and driving conditions, the motor may not need the fan. If it's not, cover the rad with something{paper,plastic} until the guage begins to show overheat condition, then the fan should start. # DO NOT LET IT GET INTO THE RED ZONE! If you keep the reservoir closed, the radiator will **** up the coolant after warming/running, and a cool down.

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it's overheating, for sure,
is coolant levels dropping? cold checked at rad cap?
"pulled over and found a hose to cool the radiator and hose near the thermostat,"
i can not understand this statement"above"
if it overheat only parked, check fan for full ops.
if overheats moving too, wont stay cool moving fast
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bad thermostat , they have 7 year life says STANT. (and why)
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water pump impellers rust 1/2 gone?

all this assumes no coolant loss, if you have loss, tell where.,
where it leans
ground
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1 Answer

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depending on how fast, this happens, could be an air lock in cooling syste, or a bad head gasket, or head. does the gauge ever go too high? can you hear gurgling in the rad, and does it ever push out coolant?

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2 Answers

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2 Answers

93 Lincoln Mark VIII


you cylinder head is cracked, or your head gasket is gone. there is a test a shop can do on the cooling sytem to see if this is so

May 26, 2009 | 1993 Lincoln Mark VIII

2 Answers

Temp guage keeps pegging out to high side.....


LOL, dont add to the environmental mess just yet!

have you replaced the sending unit for the gauge? its located usually in the intake manifold somewhere, or on one of the cylinder heads.

If thats not the problem, you may have a wire grounding out behind the dash.

my best advice is to try an aftermarket monitoring gauge with fresh wiring to the sending unit or sensor to check for this problem... hope this helps!

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2 Answers

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it sounds like an air pocket... try squeezing the rad hoses a few times and keeping an eye on the level in the rad... this is probably best done with the rad cap off... of course make sure it is cold before you remove the radiator cap.

Robert

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How is the problem with your mark? Has it been resolved? Is it physically overheating or does it just look like its hot? Have you swapped the sending unit for the coolant temp gauge?

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