Question about 1994 Ford Explorer Limited

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My 1994 Ford Explorer continiously overheats. I have changed thermostat 2 times, replaced hoses, flushed radiator, replaced fan & fan clutch. Still overheating immediately within minutes of driving. All of these different many solutions Ive tried, none have yet to help resolve the overheating.

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I agree with the first response.
Head gaskets can fail several different ways and yours has failed between the water jacket and a cylinder. This allows the hot gases produced during the firing cycle to enter the cooling jacket heating the coolant far more than normal.
If you DIY or have it done, be sure to have the head checked for warp and milled if out of tolerance otherwise the new gasket won't last very long either. If the warp is serious and milling the head would cost too much headroom, the head may have to be scrapped.
Blocks warp only rarely but it would be wise to check the block as well at the mating surface with the head.

Posted on Aug 27, 2010

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Have you checked out the converter? If it is 16 years old and partially blocked,that would restrict exhaust flow and not help get rid of heat.
Is the fan running, if not, a bad switch,not bringing it on, often enough.
Is the thermostat in the correct way, or upside down?
The water pump impeller may have corroded away, and be spinning,instead of pumping.

Posted on Aug 27, 2010

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  • Expert
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Could be a blown head gasket. or a crack in the head

Posted on Aug 27, 2010

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1 Answer

2004 explorer 4.0 coolant reservoir boils over when stabolized at normal level, no heat when level drops temp indicator normal


go to autozone rent the free tool called a block tester buy the fluid for it (about $8.00 us)drive the car make sure the resivour is about 3 inches down so you dont suck any fluid into block tester. pour blue fluid into block tester put it in antifreeze resavour. squeeze bulb sucking air from resouivour for up to 2 minutes if fluid turns yellow your head gaskets are leaking. I think you may find this to be your problem

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1990 Crown Vic over heating


engine thermostat is not mention the parts you changed, replace it.
consider the head cylinder gasket, it causes overheats.
a/c is another system, not a part of the system of first.

Sep 22, 2012 | 1990 Ford LTD Crown Victoria

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My 98 ford f150 overheats constantly. I have changed the thermostat, fan, fan clutch, gave it a flush and still overheating. A mechanic checked it and said the water pump is good cause water is...


does the heater work good, like real HOT when the truck is HOT? if not, flush the heater core with a water hose, both directions. Now when the truck is HOT open the hood and feel the air coming thorough the radiator, it should be HOT. if its not, the radiator may be plugged. If the mechanic has a Temp Gun, have him check the radiator temp, it should be uniformly HOT if you find cold spots (like if the radiator is 200f and there are places that are 150f) the radiator is plugged and "flushing" will do nothing.

Aug 30, 2011 | Ford F-150 Cars & Trucks

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I have a 1994 ford F-150 , 5- speed, 6 cylinder, Engine size 300. I have to pull over to the side of the road and turn the engine off because its overheating in stop and go traffic


If it only is overheating when going slow, then one of three problems exist; One, there is not enough coolant in the engine. Check the level of anti-freeze in the truck, and top off as neccessary.
Two,
the coolant is not circulating through the radiator and engine properly. Check the Thermostat, and replace as neccessary. The Thermostat should be changed every couple of years or so, anyway.
Three,
the air flow over the radiator is impeded somehow. Does this truck have a elcrtic Radiator fan? Or is it mechanical, being ran off the motor with a belt? If it is electric, then check the fans RELAY to see that it is working properly, and check the fan motor too. Check that there is no debris in the radiator fins.

Hope this helps.

Jun 11, 2011 | Ford F-150 Cars & Trucks

2 Answers

No visible leaks in cooling system but engine overheats. 2004 Ford Explorer 4.0L V6. Fan working fine. Any suggestions.


#1.airlock in system....undo a heater hose clip to bleed.#2 thermostat jammed..replace.#3..water pump shot..replace.#4..radiator clogged..backward flush the system..

Oct 15, 2010 | 2004 Ford Explorer

1 Answer

2000 EXPEDITION OVERHEATING 4 MILE AFTER LEAVING HOME NEW RADIATOR, FLUSH, AND NEW THERMOSTAT I DON'T KNOW WHAT THE PROBLEM IS


Here are a few things to try. Check your Radiator cap pressure as a weak cap will boil over more quickly. Replace your Temperature sending unit. There may be 2, one is for the dash gauge and the other is for engine control. Unless you have other signs of overheating you may not be overheating at all, just a bad sender.

Next, the cooling fan clutch is what the fan blade is mounted on. This is checked by using a Timing light with a RPM tach made into it. The fan clutch "locks" at a variable temperature. In cold weather it slips internally. In hot weather it engages or "locks". A mechanic measures the RPM of the blade to the RPM of the engine. This tells if the fan clutch is slipping too much internally.

Before considering a new water pump try a free scan at Autozone or Oreillys. If your Catalytic converters are plugged the engine will overheat. You should have a Code for this problem in the onboard computer. About all you can try after this is to remove the Thermostat completely and see if the engine still overheats.

You will have to replace the New Thermostat again because the other engine controls will not work right without it. But without the thermostat you can test for collapsed Radiator hoses at say 2500RPM or above. Thats about all I can think of, the water pump would cost the most. The cap, sensor-sender, fan clutch, and hoses are not that expensive.

Aug 12, 2010 | 2000 Ford Expedition

2 Answers

1994 Honda Civic LX\overheating within 2 mile drive


Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.

Aug 23, 2009 | 1998 Honda Civic

1 Answer

Bublling in the thermostat housing and very hot upper radiator hose


I recommend flushing the radiator thoroughly if not done recently. there seems to be some sort of blockage in the radiator at this time. if you get lots of metal fragments that are flushed out during this flush, i will then recommend a rebuild on the radiator or replacement of the radiator. make sure the cooling fans are cycling on time as well.

May 21, 2009 | 2002 Ford Explorer

2 Answers

High mileage 1996 Ford Explorer v8 overheats at 75-80 mph


if your mechanic seen no leaks from hoses or thermostat housing its sounds that either your fan clutch or your thermostat is bad. if its heats will driving streets and not highway its your fan clutch and needs to be replaced. if it overheats in streets and highway its your thermostat and needs to be replaced,you will need a thermostat and gasket with some silicone. Drain, follow the radiator hose to the housing and take 3 bolt off, clean housing well,CAREFULLY install the t-stat exactly the way is was taken out (pic), gasket,sillicone, bolt. ecc3d0c.jpg   its an easy job. Good luck!

Apr 27, 2009 | 1996 Ford Explorer

2 Answers

Fluxuating temp guage


its sounds your fan clutch

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