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Old 05-01-2011, 12:35 AM   #11
Focus7081
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Quote:
Originally Posted by sokratz View Post
Actually found the procedure on focushacks. Any idea what temp the fans should kick in on?

Thanks!
Here...110C* on and of @ 102C* This is the engine temp not the coolant temp.
http://www.focusfanatics.com/forum/showthread.php?t=255079
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Old 07-21-2013, 07:07 PM   #12
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I am the same problem with my 2003 2 .3 li. the fanscome when on the AC is on, but they don't come on when the car gets hot. is it possible to jumper the resistor and run the fans and high speed all the time
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Old 07-22-2013, 12:54 PM   #13
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Resistor not the issue there, it's working or fans wouldn't come on in a/c.

Last edited by amc49; 07-23-2013 at 12:57 PM.
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Old 07-24-2013, 08:20 PM   #14
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True. I have bench tested fans and works fine. I jumpered the low speed relay, and fans come on. I jumpered high speed relay and fans come on. I have replaced the cyl head temp sensor ( I replaced when i dod the head gasket). So from the way i see it, the PCM is not telling the fan relay to turn on when teperature is reached. So I am at a loss for where to go from here, other than taking it in to a shop $$$$
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Old 07-24-2013, 08:28 PM   #15
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Quote:
Originally Posted by Focus7081 View Post
Here...110C* on and of @ 102C* This is the engine temp not the coolant temp.
http://www.focusfanatics.com/forum/showthread.php?t=255079
At 97c the coolant backs up to the expansion tank and overflows. I have new tank and cap.
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Old 07-26-2013, 04:33 PM   #16
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That could just be a leak, assuming coolant and not straight water. With proper pressure retention you should have no boil there at that temp at all. You're boiling there, should not happen until cap popped. Maybe leak somewhere else.

Normal system should be able to shut down and five minutes later come back and pop cap loose and get some good hiss doing so. If it won't at all, especially even after a
minute only you have a pressure leak somewhere.

Sure the head job went right? Many often run into unforeseen troubles once one back together, simply changing gasket alone often doesn't get it by itself. Overheat affects other parts as much as the gasket. Warped head or block deck can re-leak even with a new gasket.

The PCM is NEVER going to tell low fan to come on at what it considers to be too cold.
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Old 07-27-2013, 06:07 PM   #17
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I had the head resurfaced and valve job and pressure tested. Initially I filled with 50/50 antifreeze/water. AI drove around block and it overheated. Then replaced thermostat which was corroded. (had trouble finding it, had to remove ps pump and a/c compressor to get to it). Replenished with 1 quart wayer. . At what temp should fans come on?
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Old 07-28-2013, 07:46 AM   #18
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Low fan around 225F, high at around 235F. Don't hold to exact number, it can vary a couple of degrees.
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Old 07-28-2013, 02:13 PM   #19
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That being the case, since I depleted coolant from the fozen themostat, I will drain and replenish with 50/50 antifreeze and try to get the car to that temp. I will post the outcome.
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