Hi there

take a look at the wireing pic below

as you can see there is a fuse in the interior fuse panel that runs through the a/c switch on the dash , and then goes to the low side switch ,, so start at the low side switch and see if there is power there with the key on and a/c om,,,if not then check that fuse in the car ----if there is power at the low side cycling switch ,,then jump the two wires together and move to the high side switch for the a/c ,,this switch should have power going into it and out of it ,,,if it does not then the high side switch is bad.. tell me what you find ,we can go back and forth on this page

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Chris

ok power runs through the low side switch and then through the high side switch ,,and then to the relay ,,,

also if you remove the relay for the a/c and look on the bottom of it ,,there is numbers next to each pin on the relay ,,, pin 30 and pin 86 ,ware they go into the fuse box should have power on both of them , with engine on and a/c on,,,see if both do or not , with the relay removed see if these two pins ware the relay goes have power

ok, did you remove the relay ,, turn the a/c on and car on ,,and see if you have power at pin 30 and 86 in the fuse box ware the relay went ,,,, with all switches back in place

ok,, that pin 30 ,, comes from the high side switch ,,and should have power with car on and a/c on ,,,so its back to the low side switch and high side switch as the problem,,, you said that there is power at the low side switch ,,,, and I think you said the high side switch had power going into it and out of it ,,,,,then this mean there is a open from the high side switch to the relay on the dark green/ orange wire,, so,,,if this wire has power at the high side switch ,with car on and a/c on,,, and there is no power at pin 30 at the relay ,,,then there is a open on that wire,,,, you can run a new wire from the high side switch to the relay or try to find the open ..

below is a pic o the low side switch mounted to the accumilator ,number 4

and below is a pic on the high side switch ,called the cut off switch

very odd,, you have 12 volts one of the wires at the high side switch ,,,then you jump the two wires together at the high side switch and there is still no power at pin 30 at the relay ,,, but you also checked resistance across the high side switch wire dark green/orange wire to the pin 30 ,,and had no resistance... ?????????????,, that means all is ok ,,,,, very odd,,, now I know you know how to test for power on a cercut,,, but dont take this wrong,,, how are you doing a resistance test on this wire from the high side switch to pin 30 ... ??,, just making sure , dont take this wrong , lol

ok, then I would run a new wire from the conector on the high side switch , green/orange wire , to pin 30 of the relay ,, you can just do a temp wire run not permiment just to see if this repairses the system ,, if you have about 5 feet of wire around , tap into that wire at the high side switch and then rap the other end of the wire on the pin 30 of the rely and plug it in ans see if it works

good luck

hay ,,,thats a good test you are doing to find ware the problem , is ,, now move to the low side switch and try the hot wire there and run it to pin 87 ,,, if thats ok ,,, plug the low side switch in ,,, then tap into the other wire of the low side switch , key on , a/c on ,, and run it to pin 86 ,,see if it turn the compressor on ,,,, this will help narrow down ware the problem is

ok

very odd indeed,, it could be a case of high resistance in that power feed ,, but we have to find ware it is -- now we have to go back further --look at the wireing diagram ,, power comes from that fuse 5 in the interior fuse panel then into the a/c switch and out to the low side switch ,, so lets start at that fuse 5 ,,, it may be loose or corroded, ,,run the wire from fuse 5 to the relay pin 87A and see if you can make the compressor work ,, then you have to move to the switch ...

well got nothing better to do , I broke my collar bone at work two weeks ago,, and cant do much but type

ok, you have to access the a/c control switches ,,the back of them ,,, power from that fuse 5 comes on the p/o wire to the back of the a/c controls ,,,do your test from this wire to the pin 87a,,,, if that ok,, then jump that p/o wire to the p wire , basically your by-passing the a/c switch ,,, and see if the a/c compressor turns on ,,,if it does then the a/c switch had high resistance causing the system not to work

the panel around the a/c switches pops off,,, then there is four 7 mm bolts that hold the control head in place

ok.................

ok,, just ti make sure ,,, you used a jumper wire from the back of the a/c head p/o wire to the relay and the compressor engages,,, so this means the power input to the a/c control head is ok,,,,,,,,,,,,,,then you jumped the p/o wire to the p wire on the back of the control head conector,,,,,and made sure all switches and relays ware in place , plunged in ,,,and the a/c compressor did not work .......correct ??????

ok, now run a jumper wire from the back of the a/c control head on the p wire ,,, plug everything back into place and run the other end of the jumper wire to the p wire on the low side switch ,,, you are basically running a new p wire from the control head to the low side switch ,,,,then with all plugged in place, relay in , switches in place , see if the a/c comes on

plugged in

lets go back a little again ,, unplug the control head ,, jump the p/o to the p on the control head conector ,,,,, then go to the low side switch p wire and jump that to 87a in the relay fuse box for the a/c relay ,,,, does the compressor engauge ??????

well,,its worth a try to take the control head apart and try to repaire it ,,,never tried it before,,, but what do you have to loose,,, this car did not change much over the years so ford should still make the part .... good luck

ok, sounds good

ok, never has this problem on any other unit like this ,,

good luck

Chris