Mustang GT Overheating (long)
08-01-2006, 02:39 AM
#21
1st Gear Member
Join Date: Jul 2006
Location: CA
Posts: 87
RE: Mustang GT Overheating (long)
OK, I checked the circuit diagrams and there is a control box for the fan called the 'Constant Control Relay Module' which gets a temperature reading from the powertrain control module.
It's a two speed fan controlled by the part of the Constant Control Relay Module called the EDF relay (Electric Drive Fan). This works out which speed to use with the temperature reading.
From your description it sounds like the relay for the low speed fan control is working but the relay for the high speed fan control of the fan is broken and not keeping the fan on.
I am fairly confident that your problem is with the Constant Control Relay Module.
If your car is a 96 or later model this is a black box in the right fenderwell under the plastic inner fender shield.
On a 95-95 car it is to the right of he fan shroud.
The manual says that your Ford dealer can check the controll module with a special tool.
Good luck.
It's a two speed fan controlled by the part of the Constant Control Relay Module called the EDF relay (Electric Drive Fan). This works out which speed to use with the temperature reading.
From your description it sounds like the relay for the low speed fan control is working but the relay for the high speed fan control of the fan is broken and not keeping the fan on.
I am fairly confident that your problem is with the Constant Control Relay Module.
If your car is a 96 or later model this is a black box in the right fenderwell under the plastic inner fender shield.
On a 95-95 car it is to the right of he fan shroud.
The manual says that your Ford dealer can check the controll module with a special tool.
Good luck.
08-01-2006, 04:53 AM
#22
4th Gear Member
Thread Starter
Join Date: May 2003
Location: Chi-town!!!
Posts: 1,205
RE: Mustang GT Overheating (long)
ORIGINAL: gjscott
OK, I checked the circuit diagrams and there is a control box for the fan called the 'Constant Control Relay Module' which gets a temperature reading from the powertrain control module.
It's a two speed fan controlled by the part of the Constant Control Relay Module called the EDF relay (Electric Drive Fan). This works out which speed to use with the temperature reading.
From your description it sounds like the relay for the low speed fan control is working but the relay for the high speed fan control of the fan is broken and not keeping the fan on.
I am fairly confident that your problem is with the Constant Control Relay Module.
If your car is a 96 or later model this is a black box in the right fenderwell under the plastic inner fender shield.
On a 95-95 car it is to the right of he fan shroud.
The manual says that your Ford dealer can check the controll module with a special tool.
Good luck.
OK, I checked the circuit diagrams and there is a control box for the fan called the 'Constant Control Relay Module' which gets a temperature reading from the powertrain control module.
It's a two speed fan controlled by the part of the Constant Control Relay Module called the EDF relay (Electric Drive Fan). This works out which speed to use with the temperature reading.
From your description it sounds like the relay for the low speed fan control is working but the relay for the high speed fan control of the fan is broken and not keeping the fan on.
I am fairly confident that your problem is with the Constant Control Relay Module.
If your car is a 96 or later model this is a black box in the right fenderwell under the plastic inner fender shield.
On a 95-95 car it is to the right of he fan shroud.
The manual says that your Ford dealer can check the controll module with a special tool.
Good luck.
08-01-2006, 02:38 PM
#23
4th Gear Member
Thread Starter
Join Date: May 2003
Location: Chi-town!!!
Posts: 1,205
RE: Mustang GT Overheating (long)
I took it to Sutton this morning, and they are going to get back to me in the next couple of days. It might be my constant control relay module like mentioned above. It sure sounds like it may be the culprit. Whatever the problem is, it'll be fixed. I have the extended service plan, so they said that part would be covered under it if it proves to be the cause. My concern is what caused it to go bad in the first place.
08-03-2006, 03:49 AM
#25
4th Gear Member
Thread Starter
Join Date: May 2003
Location: Chi-town!!!
Posts: 1,205
RE: Mustang GT Overheating (long)
Alright everybody, I got a call from Sutton today. The problem 'is' a falty C.C.R.M.! They are replacing it under warranty, so I should be good to go Friday
! Thanks for all the help
! P.S., do you all think I should go ahead and get that electric water pump?
! Thanks for all the help! P.S., do you all think I should go ahead and get that electric water pump?
08-03-2006, 03:10 PM
#27
4th Gear Member
Thread Starter
Join Date: May 2003
Location: Chi-town!!!
Posts: 1,205
RE: Mustang GT Overheating (long)
ORIGINAL: gjscott
Get the CCRM replaced first and then wait to see if you need the water pump. I suspect that you won't need it.
Do I get a gold star for my diagnosis ?
Get the CCRM replaced first and then wait to see if you need the water pump. I suspect that you won't need it.
Do I get a gold star for my diagnosis ?
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