No fan when engine hot - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 8 Old 06-10-2009, 08:42 PM Thread Starter
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No fan when engine hot

I posted this a couple days ago over in the modular forums but never got a response... I thought I'd try again over here:

+++++++++++++++++++++

Greettings,

I ran a couple of lapping days in my 97 GT last weekend and had an over heating situation occur that puzzled me. At the end of a 20 minute session of hard running the temp gauge had finally climbed to the far side of the "L" in NORMAL. I did my normal cool off lap and and was expecting the temp to start to drop a little. It actually went up a bit more. When I pulled into the paddock the car started puking coolant out of the radiator cap. I left the car running to keep coolant cycling thru the radiator when I realized that the fan was NOT running. We had just put a new CCRM in the car a month or so before and everything had been working fine. I then tried to see if the fan would kick on when I turned the A/C on which should trigger the high speed fan. Still no fan. The temps started to drop a little (I had put the nose of the car into the wind to try to help the situation) and I shut it off and let the car cool off on it's own.

I came back to it after 30 minutes and started the car to see what was what. I turned the A/C and the fan kicked right on like normal. I let the car sit and idle and it came up to its normal temp and the fan cycled like it should. I washed the spilled coolant off the engine bay and refilled the overflow with straight water (it took a couple of times as it re-entered the system)

I went back out for my next session and I was really watching the temp gauge. I didn't let it get quite as warm this time and came in early. I didn't hear the fan running from inside the car when I came into the paddock so I immediately went out the gate and drove around on the public roads to get air to the radiator until the gauge got back to the cool side of the "A" in NORMAL. When I got back to the paddock the fan was finally on.

So, here's my question: Any reason why a fan would act like this? Not running when the car is pretty darn hot but runs fine in normal operation?

The car is a 97 GT with no engine mods. I turn the heat on in the car to try to help keep things cool in the engine. I am planning on doing the fan switch mod after what happened this weekend. I'm also thinking of going to a 03-04 Cobra radiator or a Mishimoto.


Jan G.
97 Mustang GT, 92 Civic Si, 93 Escort LX (the "Escargot"), 01 Ram 1500 4x4
2007 SCCA RallyX RPF National Champion! 95 Neon ACR (totalled 2/5/08)
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post #2 of 8 Old 06-10-2009, 09:36 PM
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There are two fans settings, low speed and high speed. Is it possible that the low speed fan is operating fine, but the high speed setting has a wiring or relay problem?

Is there an advantage to the 03/04 radiator? I thought it might be AL. The weight is the same as the GT radiator so I guess if it is AL, it must be larger or have more material and area.


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post #3 of 8 Old 06-10-2009, 11:18 PM
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I believe the fan is locked out at speeds 40+mph..........is your VSS working properly?

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post #4 of 8 Old 06-10-2009, 11:32 PM Thread Starter
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I knew I would get better responses over here!

Quote:
Originally Posted by BULLITT1992 View Post
There are two fans settings, low speed and high speed. Is it possible that the low speed fan is operating fine, but the high speed setting has a wiring or relay problem?

Is there an advantage to the 03/04 radiator? I thought it might be AL. The weight is the same as the GT radiator so I guess if it is AL, it must be larger or have more material and area.
That could be an issue. The car has 130k on it and the fan could be on it's last legs. We did have a problem with no high speed fan that we thought we traced to the CCRM (the box that hides in the fender that controls the fan) so we replaced it and the high speed fan seemed to then work fine. Maybe it's the fan that's taking a crap on us?

I think the 03/04 radiator is an alumium 2 row unit that should drop right into my 97 GT.

Quote:
Originally Posted by indy2000 View Post
I believe the fan is locked out at speeds 40+mph..........is your VSS working properly?
Locked out... meaning it doesn't opperate if the vehicle is traveling over 40mph? Interesting. I'll definately look at doing the fan mod so I can turn it on independently with a switch.

Ok, you got me on that one. What's a VSS? I'm guessing Vehicle Speed Sensor?

Jan G.
97 Mustang GT, 92 Civic Si, 93 Escort LX (the "Escargot"), 01 Ram 1500 4x4
2007 SCCA RallyX RPF National Champion! 95 Neon ACR (totalled 2/5/08)
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post #5 of 8 Old 06-11-2009, 12:14 AM
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Heat kills electronics. IMHO, the fan seems like its on its last leg. When your motor gets hot, the malfunction is showing itself?

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post #6 of 8 Old 06-11-2009, 12:31 AM Thread Starter
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Quote:
Originally Posted by onefastsvt View Post
Heat kills electronics. IMHO, the fan seems like its on its last leg. When your motor gets hot, the malfunction is showing itself?
I think so. I've only had this car since Nov 07 and it's only been on the track a couple of times now. I also think that the radiator is probably in need of replacement after 130k as well. I have been slowly getting the car up for more track use as well as getting used to RWD. Since this spring I finally got rid of the 2.73's and I just installed some brake ducts for the wimpy 97 GT brakes. I'm putting on some Cobra size brakes (C4 'vette actually) as soon as I source some SS lines and the correct caliper/banjo bolt.

Jan G.
97 Mustang GT, 92 Civic Si, 93 Escort LX (the "Escargot"), 01 Ram 1500 4x4
2007 SCCA RallyX RPF National Champion! 95 Neon ACR (totalled 2/5/08)
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post #7 of 8 Old 06-11-2009, 07:16 PM
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You can trouble shoot the system and I highly recommend that you fix it properly according to factory procedures.

....

Or, you can quickly wire in a high speed fan override switch. The override switch will allow you to run the fan as long as you wish whenever you wish.

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post #8 of 8 Old 06-16-2009, 01:25 PM
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check the harness. my ground wire got burned up and was making intermittent continuity. Ford sells a replacement harness kit so I'm guessing it's a commong problem.

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