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the-big-e
04-05-2005, 03:51 PM
I have replaced the fan, IRCM, and ECT......

The original fan would not come on at all even after swapping the IRCM and changing the ECT......

I unplugged the ECT and the hi speed fan comes on all the time, as well as the CEL.......

I changed out the fan this morning and now the hi speed fan comes on as the temperature gets past the M in NORM then shuts off as the temperature decreases.........I have yet to see low speed.....

When the ECT is unplugged, the temperature stays dead on the O in NORM no matter how hard I drive the car.......... :confused:

I bought the ECT from NAPA and I think it is listed as a universal part.......

Would it be better to just buy this part from the stealership?????? :mad:

David Neibert
04-05-2005, 04:13 PM
When the ECT is unplugged, the temperature stays dead on the O in NORM no matter how hard I drive the car..........

Probably because the high speed fan stays on and the fuel mixture is richer.

I would try cutting wire #14 on the ICRM and if it still doesn't come on, there may be a problem with the fusable link. I'm not really sure if high and low speed use the same fuse, if not I would look there.

David

PS: Does the low speed fan come on if you turn on the AC or defrosters ? It should so long as your under 40 mph.

the-big-e
04-06-2005, 03:50 PM
According to page 56 in my electrical trouble shooting manual, there is only one fuseable link......I think it sits under the washer tank......

What happens when the #14 wire is cut?

David Neibert
04-06-2005, 06:10 PM
According to page 56 in my electrical trouble shooting manual, there is only one fuseable link......I think it sits under the washer tank......

What happens when the #14 wire is cut?

Several people around here have wired a switch into wire #14 to have manual control over the low speed fan function. When #14 is cut it signals the ICRM to turn on the low speed fan. It will stay on (when ignition is on) no matter what the coolant temp is.

This is only a problem if coolant temps get high enough that the high speed fan is turned on by the EEC. With both the high and low speed circuts engauged the fan will turn slower and pull more amps that it would if the low speed was turned off whenever high speed is turned on.

David

matteo
04-06-2005, 07:40 PM
Can you scan the AC system schematic out of your electrical troubleshooting manual for me please? I live in AZ and the temp will be 115 before long, and my AC does not work. Please email it to [email protected] if you can scan it. Thanks a lot.

TbirdSCFan
04-06-2005, 10:30 PM
Can you scan the AC system schematic out of your electrical troubleshooting manual for me please? I live in AZ and the temp will be 115 before long, and my AC does not work. Please email it to [email protected] if you can scan it. Thanks a lot.What sort of problems are you having with the A/C? By that, what is it doing and what is it not doing? A bit more detail and I might be able to help you out... I'm sort of the resident A/C guru.... really.. ;)

matteo
04-07-2005, 03:07 AM
I'm sort of the resident A/C guru.... really.. ;)
Awesome. Well, the face of the unit was reading e2 and e7, so I replaced it. Now the computer seems to work, but no air-conditioned air is coming out. Not even hot air from the motor, just plain old fan. My buddy (master technician ac specialist at ford) said the compressor didnt come on when he was playing with it and hes pretty sure its an electrical problem.

This guy can definitely fix the problem, but I feel bad always making him work on my car with me, so I figured if I got as much information from here as possible it will go real smooth when we work on it. Id definitely appreciate your help, let me know what else you need to know, or if you want me to try anything. ([email protected] is the best way to get me). Thanks a lot.

the-big-e
04-07-2005, 09:11 AM
Can you scan the AC system schematic out of your electrical troubleshooting manual for me please? I live in AZ and the temp will be 115 before long, and my AC does not work. Please email it to [email protected] if you can scan it. Thanks a lot.
I don't have a scanner..... :(

PM me a fax number and I'll get the info to you..... :)

TbirdSCFan
04-07-2005, 10:49 AM
Awesome. Well, the face of the unit was reading e2 and e7, so I replaced it. Now the computer seems to work, but no air-conditioned air is coming out. Not even hot air from the motor, just plain old fan. My buddy (master technician ac specialist at ford) said the compressor didnt come on when he was playing with it and hes pretty sure its an electrical problem.

This guy can definitely fix the problem, but I feel bad always making him work on my car with me, so I figured if I got as much information from here as possible it will go real smooth when we work on it. Id definitely appreciate your help, let me know what else you need to know, or if you want me to try anything. ([email protected] is the best way to get me). Thanks a lot.
:eek: I'll have to confess I know a fair amount about the earlier vaccuum mechanical operated A/C, but I'm not going to be a lot of help with the digital controls and wiring. I at my guru limits. :rolleyes:

But I'm fairly certain that you can at least check for compressor operation by turning on the A/C, running the engine and briefly jumpering (a few seconds) the pressure switch connector on top of the accumulator. If it runs, next test is to check the running pressures. A lot of the time, refrigerant will leak and the pressure gets too low to trip the switch and hence run the compressor. If it is a leak, you'll need to locate it and fix it.. there are U/V dye kits that can help. Better yet are freon and r134 sniffers, but they cost $$. You might see if your friend can do this for you if he has a guage set. :)

the-big-e
04-07-2005, 03:41 PM
Several people around here have wired a switch into wire #14 to have manual control over the low speed fan function. When #14 is cut it signals the ICRM to turn on the low speed fan. It will stay on (when ignition is on) no matter what the coolant temp is.

This is only a problem if coolant temps get high enough that the high speed fan is turned on by the EEC. With both the high and low speed circuts engauged the fan will turn slower and pull more amps that it would if the low speed was turned off whenever high speed is turned on.

David
So let me see if I got this straight......

If I cut the #14 wire, the fan comes on just like disconnecting the ECT only the fan runs at low speed instead of high speed and the CEL stays off and the EEC will not compensate for it.....

I then install a manual switch into the #14 line......

This will give me high speed fan when switched off and engine temps are high..... :confused:

ThunderDave
04-07-2005, 04:54 PM
Eddie, the info I have says the wire should be brown with a dull red stripe, but mostly brown. Make sure it's #14 though, before cutting.

the-big-e
04-08-2005, 09:37 AM
That is the correct wire.....

I pulled the IRCM clips off to get to the wire bundle just so I could be sure......

All of the wires were the same color........ ;)

Lots of dust and road grim down there......

I put a paper clip on it so I'll know which wire to cut......

David Neibert
04-08-2005, 01:29 PM
So let me see if I got this straight......

If I cut the #14 wire, the fan comes on just like disconnecting the ECT only the fan runs at low speed instead of high speed and the CEL stays off and the EEC will not compensate for it.....

I then install a manual switch into the #14 line......

This will give me high speed fan when switched off and engine temps are high..... :confused:

All correct except the last sentence. The high speed fan will come on when and if it reaches the designated temp no matter what position the switch on wire #14 is in.

The EEC would normally turn off the low speed power the same time high speed power was turned on. If your manually keeping the low speed fan on by breaking the circut on wire #14, both the high and low speed windings of the fan motor will be getting power. It's not really a big deal because I ran my car that way for more than a year without a problem. But it will cause the fan to operate a little slower in high speed mode, because the low speed function is dragging it down.

Here is a diagram David Dalke drew of how to wire it for controlling both the low and high speed functions and still retain EEC control of the fans if you screw up and make the settings too high or if one of the added componets were to fail. I had my car wired like this for about a year and it worked perfect.

http://members.tccoa.com/dneibert/fan%20relays.jpg

David