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Cooling fan wiring repair
I just thought that I would share my cooling fan repair experience. This information may or may not have been disseminated before but I do know that it took a significant amount of research and a little luck to figure it out.
For those of you who don't know this, your fan controller connector is overheating if you haven't upgraded to the higher capacity connector supplied by Ford. It is just a matter of time before the connection fails and your fan stops working. For those of you that have jumpered your fan to run constantly, it will happen sooner.
First, the correct part number for a new controller is E4ZZ-8B658-B (Motorcraft P/N RR-10). This is an obsolete part but some are available from various Ford dealerships around the country. There is another post somewhere that shows this part as containing the new wiring upgrade kit. MINE DID NOT HAVE IT!! In fact, the part number of the controller was different than the one on the box but according to the engineering revision information it is interchangeable with the orginal. Before you order a fan controller conduct the following:
Locate the controller. It is underneath the steering column just a little towards the door. You will have to shoehorn yourself into the footwell to see it. It is a black box about 3 inches wide with a silver bracket bolting it to one of the dash supports. It will have a beige/gray 8-pin connector with 6 wires going into it. Pull the connector off and look at the connections to see if one is melted. Mine was, 2nd from the right. The connections as viewed from left to right(clip down) are 12VDC (Ignition), Blank, AC (maybe), Fan supply,I have no idea, Blank, 12VDC (Battery) and Temp switch. The battery connection is the common failure point. If it is melted you will need the wiring kit from Ford. It is part number E4FZ-8C290-A. This is applicable to the 83-89 Mustang. Once again it is obsolete but about a dozen are still available from the Ford parts network which is accessible from any Ford parts department. This kit costs about 50 bucks and contains two connectors and 5 new connectors. I don't know why it only has 5 of them. The priority connector to replace are the 12 VDC connections. The connectors are crimp on, just cut off the old connector and put the new one on.
Test your fan and controller. Find the temp control switch. It is located on the bottom of the lower intake manifold right in the center towards the engine. It has a single wire going onto a threaded post. Take the connector off and ground it with the ignition on. Your fan should start. If not, then you need to check the continuity of the wiring. I used jumpers to the ground of the battery and a meter at the plug under the dash. For example, ground one wire of the fan and check the fan supply pin on the connector to ground, be sure to check it grounded then immediately ungrounded to ensure that the ground goes away and comes back consistently. If the wiring looks good then you probably need a controller, which also costs about 50 bucks.
I hope that this is of some help to those of you with fan problems. Just for your information, I was unable to find a wiring diagram for this system. There may be one in the detailed drawings available online but I just poked around until I figured it out. Good luck!
For those of you who don't know this, your fan controller connector is overheating if you haven't upgraded to the higher capacity connector supplied by Ford. It is just a matter of time before the connection fails and your fan stops working. For those of you that have jumpered your fan to run constantly, it will happen sooner.
First, the correct part number for a new controller is E4ZZ-8B658-B (Motorcraft P/N RR-10). This is an obsolete part but some are available from various Ford dealerships around the country. There is another post somewhere that shows this part as containing the new wiring upgrade kit. MINE DID NOT HAVE IT!! In fact, the part number of the controller was different than the one on the box but according to the engineering revision information it is interchangeable with the orginal. Before you order a fan controller conduct the following:
Locate the controller. It is underneath the steering column just a little towards the door. You will have to shoehorn yourself into the footwell to see it. It is a black box about 3 inches wide with a silver bracket bolting it to one of the dash supports. It will have a beige/gray 8-pin connector with 6 wires going into it. Pull the connector off and look at the connections to see if one is melted. Mine was, 2nd from the right. The connections as viewed from left to right(clip down) are 12VDC (Ignition), Blank, AC (maybe), Fan supply,I have no idea, Blank, 12VDC (Battery) and Temp switch. The battery connection is the common failure point. If it is melted you will need the wiring kit from Ford. It is part number E4FZ-8C290-A. This is applicable to the 83-89 Mustang. Once again it is obsolete but about a dozen are still available from the Ford parts network which is accessible from any Ford parts department. This kit costs about 50 bucks and contains two connectors and 5 new connectors. I don't know why it only has 5 of them. The priority connector to replace are the 12 VDC connections. The connectors are crimp on, just cut off the old connector and put the new one on.
Test your fan and controller. Find the temp control switch. It is located on the bottom of the lower intake manifold right in the center towards the engine. It has a single wire going onto a threaded post. Take the connector off and ground it with the ignition on. Your fan should start. If not, then you need to check the continuity of the wiring. I used jumpers to the ground of the battery and a meter at the plug under the dash. For example, ground one wire of the fan and check the fan supply pin on the connector to ground, be sure to check it grounded then immediately ungrounded to ensure that the ground goes away and comes back consistently. If the wiring looks good then you probably need a controller, which also costs about 50 bucks.
I hope that this is of some help to those of you with fan problems. Just for your information, I was unable to find a wiring diagram for this system. There may be one in the detailed drawings available online but I just poked around until I figured it out. Good luck!
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