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Old 06-22-2016, 12:09 AM   #1
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Overheating sometimes

I have a 2004 focus 2.3l. I have installed a new motor and tranny last year only has 16,000 miles... I have notice it overheats when it has to put in work... I flush the coolant, replace the thermostat and check the head... I have no leaks and my fans kick on when they are supposed to do... I don't know what to look for now. I'm thinking about buying fluid from AutoZone to cool the engine down but I don't know if it works... Any suggestions would be helpful.


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Old 06-22-2016, 02:07 AM   #2
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Moved to General Tech Chat

First question is obligatory on the fans - have you seen TWO speeds and when does the first & second level kick on.
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Old 06-22-2016, 04:28 AM   #3
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Sure that's not one with THREE fan speeds?
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Old 06-22-2016, 07:23 AM   #4
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Don't recall seeing two speeds. The first kicks on about 1/2 way and the second runs around kicks on 3/4.. but if I just turn the heat up to one it goes back to normal temperature..
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Old 06-22-2016, 12:56 PM   #5
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Quote:
Originally Posted by amc49 View Post
Sure that's not one with THREE fan speeds?
I think the OP should have the 3-speed system. The 3-speed systems were apparently put on '03 and '04 models with Zetec and SPI. If it has the 3-speed system, then the battery junction box will have 4 fan relays...R9, R10, R15, and R16.
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Old 06-22-2016, 01:36 PM   #6
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I only have a relay for R-16. I have the 2.3 DOHC
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Old 06-22-2016, 02:47 PM   #7
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Duh... I should have read your first post better. You said you had a 2.3L.

But if you have R16, then I think you should have R15 as well. One relay for low speed, and one relay for high speed.
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Old 06-22-2016, 03:38 PM   #8
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When I got the car I never seen a relay in that spot and that was two years ago .... There is a place to put one I always thought it was a dud though ... But if that's the problem wouldn't I noticed it sooner for overheating...?
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Old 06-22-2016, 06:25 PM   #9
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Quote:
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When I got the car I never seen a relay in that spot and that was two years ago .... There is a place to put one I always thought it was a dud though ... But if that's the problem wouldn't I noticed it sooner for overheating...?
Not likely. If the cooling system is operating as it should be, the temps would only rise high enough to cause a fan to kick in when you have been driving hard, or at highway speeds and then stop. My fans rarely ever come on- unless the AC is on.

Remember, fans only cool off the engine when the car is moving slowly. I don't know what speed the fans cut off at, but they do not stay on while the car is moving- it's pointless, the blades will be turning due to the force of air through the grille while the vehicle is moving.
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Old 06-22-2016, 06:54 PM   #10
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R16 only in my '04 2.3, no contacts in the R15 slots.
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