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My 99 Ford Windstar overheats when I press brake? Replaced thermostat, radiator, and sealed head gasket

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  • Cars & Trucks Master
  • 20,706 Answers

My guess is you think the dash guage dont lie?
define overheat.
1: pyro IR gun shoot thermostat house it read 250F?
2: steam rising from hood.
3: green coolant every where.
just a hint, and we can proceed.

define overheats, what made you think that........??????????

Posted on Oct 15, 2013

  • 28 more comments 
  • Kiki K Oct 15, 2013

    The gauge goes to h and fluids bubble out of overflow tank but only when braking i have to put it in park at light and no heat

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    _-__-___-_ Oct 15, 2013

    ok braking does shift the center of gravity and a full side tank(its not supposed be full see full line in center) will spill AF. (in park what?)

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    _-__-___-_ Oct 15, 2013

    the overflow tank , captures normal expansive AF , the fluid expand in the rad the fluid captures, this is not bubbliing, if in fact the rad is sending bubble to the 1/2 filled , overflow tank that is overheating.

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    _-__-___-_ Oct 15, 2013

    so that begs the questions, when? stopped only moving only? both?

  • Kiki K Oct 15, 2013

    Its starts to bubble out while driving

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    _-__-___-_ Oct 15, 2013

    on a cold engine, if you remove the RAD cap, is the rubber gasket still crack free (this is a 1st time item)

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    _-__-___-_ Oct 15, 2013

    the cap that works holds the RAD pressrure near 14psi, raising the boiling point of the AF.

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    _-__-___-_ Oct 15, 2013

    that begs the question is the coolant at 50/50? ratio AF and water, a ratio tester is like $2 at any outo store., and all cars boil over easy with bad cap and water only in the loop.

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    _-__-___-_ Oct 15, 2013

    that is a start as is getting that side tank at 1/2 full no 100%^ full

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    _-__-___-_ Oct 15, 2013

    then when the engine is dead cold , off the cap, is the RAD 100% full,

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    _-__-___-_ Oct 15, 2013

    if not fill it with matching color AF, at 50% ratio. make sure hose it the expansion tank did not fall off or the rad will drop level every day./

  • Kiki K Oct 15, 2013

    The overflow tank is never 100% only to fill line the radiator cap is still the original one could this be the problem

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    _-__-___-_ Oct 15, 2013

    sorry but i can't see all that. there are many ways to overheat. from the $5 cap a $200 RAD or bad head gasket. bad rad fan, etc. does the car overheat moving fast.? or is the impossible to do , due to it overheats before i can hit the road/?

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    _-__-___-_ Oct 15, 2013

    im ignoring the brake thing due to its really overheating. It is possilbe too that the brake lamps overload the speedo cluster causing the temp guage to fail. but im not there to see that. so must assume the engine really does overheat and that the person replacing all those parts, in fact, got all the air out of the system, trapped air in the system is really bad for it. was the water pump inspected during this head job?

  • _-__-___-_
    _-__-___-_ Oct 15, 2013

    was the head gasket put on backwards? is the A/C condensor up front packed full of filth, is the fan working on front of engine? if a non electric the clutch must lock up, but if is electric it must turn on when engine overheats does it?

  • _-__-___-_
    _-__-___-_ Oct 15, 2013

    clutch fan or electric fan which is it. some older cars can be change. or modified

  • Kiki K Oct 15, 2013

    Only when pressing brake is when it overheats and it will go back down once I'm driving I didn't replace head gasket just got a seal about 5 days ago before seal it would overheat when driving over 10 mins I was thinking I should replace my water pump I have done everything except water pump heater core new brakes and radiator cap

  • _-__-___-_
    _-__-___-_ Oct 15, 2013

    press brake, do you mean stopped or slowing from speed.

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    _-__-___-_ Oct 15, 2013

    my guess, is all alone you meant , not moving it overheats. as most do, that do overheat.

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    _-__-___-_ Oct 15, 2013

    you mean the cover seal is new, that is only and oil seal.

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    _-__-___-_ Oct 15, 2013

    so it overheats parked, not moving, so is the fail locking up. ? what fan is there, electric or a clutch fan, it must lockup if clruch fan. do you know how to test the fan? this fan is all ther is for cooling stopped, no forward velocity means no air flow through the RAD.

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    _-__-___-_ Oct 15, 2013

    day one, and electric fan, out of factory 1999 here is the why it works

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    _-__-___-_ Oct 15, 2013

    The PCM determines when fan operation is required by monitoring coolant temperature, vehicle speed and air conditioning status. When operation is required, the PCM signals the Constant Control Relay Module (CCRM) to turn on fans to desired speed.

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    _-__-___-_ Oct 15, 2013

    the ECT shows to hot, (scan tool can see it) and the CPM commands on the fan , if not bingo. most cars it it turns on from 224 to 250F. if not its BUSTED

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    _-__-___-_ Oct 15, 2013

    3.0L or 3.8L ? and it has 2 fans wired in parallel. schematic next

  • _-__-___-_
    _-__-___-_ Oct 15, 2013

    http://www.fixkick.com/look/odds-ends/99...

  • _-__-___-_
    _-__-___-_ Oct 15, 2013

    the slow speed mode is A/C on, the fast turns both fans on full blast for SURE at overheat, if not its MALFUNCTIONING

  • _-__-___-_
    _-__-___-_ Oct 15, 2013

    im i getting close yet

  • _-__-___-_
    _-__-___-_ Oct 15, 2013

    correlataion is not causation, there are many ways to overeheat.

  • _-__-___-_
    _-__-___-_ Oct 15, 2013

    one more, see that schematic, i can only hope all fuses there are good.

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SOURCE: ford ranger truck overheating

I have had this happen with my ranger. Changed everything I could to try to fix the over heating. It turned out that I had a small leak in my head gasket and it was allowing exsaust gas to go into the cooling system witch was over pressurizing it. Also the air from the exsaust will heat up much faster than liquid making your thermostat to read hot and will not be able to blow hot air in the cab because there is no liquid going to the heater core. This happened to me when my blet came off and I tryed to make it home. If you had it over heat for a long peirod of time it may have ripped the head gasket.

Posted on Feb 21, 2009

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SOURCE: Hi, my 99 vw beetle

Head gasket for sure would cause it to smoke and get hot. May seem like a stupid question, but did they check the thermostat? If head gaskets are good now and radiator was replaced, look for the obvious. Thermostat or air bound engine. An air pocket in the engine could also cause this. Need to bleed the air out of the cooling system. Some cars have a bleed screw to do this.

Posted on May 21, 2009

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SOURCE: my 99 cavalier is overheating i have changed head,

During the summer, you can run without a thermostat without any significant problems. In cold weather however, having no thermostat will prevent your car from warming up to normal operating temperature in a reasonable period of time, which will put additional stress on the engine and reduce your gas mileage substantially. You will also get virtually no heat to the passenger compartment. Two things you should check in regards to overheating: Is your water pump working and does your radiator fan switch on when the temperature rises above @190 degrees? If the vehicle has over 100,000 miles on it, you might as well replace the pump now. Don't use a rebuilt pump. They are ****. Get a new pump and a good quality thermostat. If the fan doesn't come on when it should, you probably need an new fan switch/sensor. These are inexpensive and easy to replace. Also check for signs of damage to the wiring leading to this sensor, and check the fan fuse and relay. Finally, make sure that your antifreeze mix is no more than 70% antifreeze to water for winter weather, or 70% water to antifreeze in summer. 50/50 is a good bet for year-round reliability, but a higher % water will tend to cool the engine more efficiently. Having said all that, I suspect your water pump is the main problem. If you notice a slow drip of coolant near the pump, you can be almost certain it has failed.

Posted on Dec 19, 2009

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SOURCE: Head gasket is damaged. 2005 Nissan Sentra, 1.8

i have a 2005 1.8 nissan sentra.i rplaced the radiator becuause it was leaking.so when i did i took it for a test drive and the needle went to hot then back down to middle ways between the C & H BACK IN FORTH.so i replaced the thermostat. now as far as i can tell it is staying in the middle of C & H. i can't feel no water though cerulating through the top or bottom hose of the radiator. so now that i told you what i done so far my question is???? ( my heater is not working in the car it is blowing out cold air & i left the car runnng for about 45 min. even took it up and down the road.still cold air.what do you think i need to do?????????? )

Posted on Jan 07, 2010

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SOURCE: 1997 ford contour 4 cyl manual- overheating after only 5 mins

first check and see if the fan is comming on when it gets hot if it does and you dont see any white smoke i would replace the radiator.

Posted on Feb 09, 2010

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1 Answer

My heater on my 95 ford windstar blows cold air not hot what is it


Thermostat and change your radiator cap, if your adding antifreeze alot than it may be a blow head gasket. I was loosing antifreeze out my tail pipe, tried fiberlock http://www.autozone.com/autozone/accessories/K-W-Products-32-oz-FiberLock-head-gasket-and-block-repair/_/N-255s?itemIdentifier=249495 and it worked. Make sure your upper and lower hoses are good and not squishy. I did the thermostat the radiator cap and hoese and I got my car working. I have 224,000. on my windstar and still going strong. And windstars are not know to live lone because of there head gaskets. Good luck.

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I have a 1999 ford windstar it over heats


Has the radiator been checked for rust? bet it is red with rust right now from a leaking engine cylinder head gasket, very common in this van. Remove the radiator and have it professionally cleaned and replace the thermostat and flush the engine block and put a can of head gasket sealer in the system on refill with clean new coolant mixed 50/50 with low alkaline water like drinking water from the store..

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Where Does The Overflow Tank Hose Connect


to weaker mixture will cause vehicle to overheat ,but i think that the radiator cap rubber has perished causing the coolant to throw out or the head gasket ,get the cooling system pressure tested ,and then run engine with gauge attached to check for excessive pressure build up ,(head gasket test) ,another trick is to fit a bottle to end of the overflow pipe so what goes out gets sucked back in when engine cools .Check the rubber seal in teh rad cap and check the seating that it pushes and closes onto.As for the sliding doors use your judgement and you will not go far wrong

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Finding the thermostat is easy. Just follow the top radiator hose back to the engine.
The question I have is how to get to the bottom screw of the thermostat housing.

Any Sugustions anyone?

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