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Old 09-02-2012, 01:54 AM   #1
kenified06
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2002 Focus Overheating.. Running out of Ideas

Hey guys.. I have a 2002 2.0 ztech.. After a few minutes of driving temperature goes to the red and stays there until I pull over and let it cool off.. there is water boiling and steaming out of the reservoir.. Engine performance Is fine.. No white smoke.. No oil and water mixing.. Took the thermostat off the car and realized someone had gutted it.. replaced that. Even replaced the housing. Then went to the water pump.. It was fine but replaced it anyways. Then flushed out the radiator with a garden hose. Got alot of orange sludge out of it.. A whole lot.. Water runs through clear now.. Bled the air out. Then went ahead and tore it down and replaced the head gasket. Head is not warped or cracked. Heat is working fine so I don't wanna go under the dash and mess with the heater core.. Fans seem to be working proper..What in the heck could be wrong with this thing???


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Old 09-02-2012, 02:06 AM   #2
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checked your reservoir cap or coolant bottle? I've seen the bottle not allow the cap to seal properly and both will cause it to overheat. Does it overheat at idle?
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Old 09-02-2012, 02:13 AM   #3
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Yeah it actually seems to overheat even faster when at idle or when I'm off the gas
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Old 09-02-2012, 06:54 AM   #4
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Quote:
Originally Posted by kenified06 View Post
Yeah it actually seems to overheat even faster when at idle or when I'm off the gas
That usually is the fan cooling resistor. Your fans have 2 speeds. If the low speed is not working, the engine will overheat at idle. It will not overheat with the AC on because the fans run at high speed with the AC on.

You can check the temperature at which the fans come on by using the electronic odometer trick to monitor temps. Key off, press and hold the odometer reset button. Turn key on, hold odo reset button until the odometer reads [test]. Now you're in test mode, and you will remain in test mode until you turn the key off, and each time you press and release the odo reset button it will scroll through one of 30 test functions. The one you're looking for looks like this [30 C] or whatever your ambient temp is on a cold engine in C. Now this might sound goofy, but the fans come on at very high temperatures. Low speed is around 115C, and high speed is 118C. This engine is designed to run as close to overheating as possible.

Usually the low speed causes the sort of overheating you're experiencing, but since the high speed comes on- people think the fans are working correctly.

As far as the heater core goes, you can check it by removing it's hoses from the engine, and then flushing it out. I doubt that the heater core is the problem in this case, and wouldn't change one until it leaks inside the car.
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Old 09-02-2012, 02:46 PM   #5
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Gonna take all the hoses off and check them good.. Also going to test the fan and then flush the radiator out again..
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Old 09-02-2012, 05:30 PM   #6
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Flush radiator with hot and cold water and feel for the areas to make sure all the channels are clear to.. But the fan does sound to me like the #1 reason
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Old 09-02-2012, 11:04 PM   #7
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First thing we did today was go into test mode and checked the temperature until the fans was supposed to cut on and both did... Next we flushed the radiator from bottom to top. We got a bunch more of that orange rust out of it.. Later we checked the hoses and one of the small 2 small hoses on the reservoir (the one that goes to the top of the radiator) was completely clogged up with debris.. Flushed that out.. Now there is no more over heating issue.. Also a ton of orange stuff came out of the radiator once we got it running again.. Guessing we worked it loose enough to finally come free. Gonna wait till morning and flush it back out again.. Running fine now though other than a little bit of bubbling still in the reservoir... guessing from air or all that sludge that just went everywhere.. water temp steady just below halfway
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Old 09-03-2012, 01:51 AM   #8
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FYI, the fans are on LOW speed all the time with a/c on until highside pressure gets to 250 psi+, THEN high fan kicks in.
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Old 09-03-2012, 02:56 PM   #9
kenified06
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The a/c on the car isn't working.. so we couldn't test that way. We just held the odometer button until It went into test mode and checked if they kicked on at the proper temperature
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Old 09-03-2012, 02:59 PM   #10
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I would use a flush chemical... and refill with distilled water and gold antifreeze
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