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  #13  
Old 05-22-2016, 02:44 PM
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Re: Over heating problem

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Originally Posted by RWW6542 View Post
It did boil a couple of times. Since the radiator swap I have had to add coolant to the radiator, in small amounts. It doesn't seem to be pulling water from the jug...
That brings up another possibility. It may still have air in the system. It may be slowly burping out air and that's why you have to keep adding coolant. Find out how to bleed out the air cause I don't know.

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Old 05-22-2016, 02:49 PM
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Re: Over heating problem

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Originally Posted by hoffmanestates View Post
Yeah
Yeah to both ?
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  #15  
Old 05-22-2016, 07:21 PM
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Re: Over heating problem

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Originally Posted by RWW6542 View Post
Yeah to both ?
It is a NO. There is no relay in the hydraulic fan system. The PCM controls directly the hydraulic control solenoid which is mounted on the hydraulic fan motor. (the relay under the headlight is only for the electrical cooling fan setup until 2003)
Regarding the speeding up of the fan with the AC on, i never heard my fan speeding up when the AC is switched on, even on the hot days we have overhere. But the PCM gets the pressure signal of the AC system and it can speed up the fan, depending on this pressure signal.
But your problem should not be related to the cooling fan, since it runs warmer on the highway, when the fan is not supposed to be working, and cool when at idle.
Oveheating this engine is a NO-NO, it will easily warp heads when overheated.
There is a good change that a head gasket is leaking after the overheat. It would be wise to do a pressure test on the cooling system, to see if there is an internal leak. If there is an internal leak, you mostly see that the cooling system overflow reservoir stays full, but that the level in the radiator is low.
Also when the radiator is full and there is a headgasket leak, you can see air bubbles in the overflow reservoir. You also need to check the engine oil, to see if no coolant is mixed in the oil. (which creates a white foamy substance.)
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  #16  
Old 05-22-2016, 07:38 PM
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Re: Over heating problem

Now in my defense. When a/c runs my fan ramps up to a noticeable tone. Not a 747 take off but maybe a Cessna.
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Old 05-23-2016, 05:41 PM
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Re: Over heating problem

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Originally Posted by Governor View Post
That's the direction I was thinking. Seems like water is now going somewhere with no leaks. But with all these electronics who knows? I'm too old school. Frango100 seems to be up on codes and electronics and tends to follow a logical flow path toward a solution. Interested to find out the cause.
Yea, Frango100 seems to know more about the electronics than I do too haha!
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Old 05-24-2016, 04:47 PM
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Re: Over heating problem

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Originally Posted by hoffmanestates View Post
Now in my defense. When a/c runs my fan ramps up to a noticeable tone. Not a 747 take off but maybe a Cessna.
It's currently 87 in chicago and have a/c running. I definitely feel and hear the engine fan ramped up in speed.
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