When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
My daughter has a 2001 ford expedition with a 5.4 gas burner.
She had ac problems no one at the shops including the ford place at her hometown and they could not fix her problem.
She was losing freon. I found the leak it was on the compressor where the pump is put together. I put another compressor on it and now I cannot get current to the low sensor. I have checked all the fuses and relays.
I was reading on an article that the wot if it went bad would cause the ac to not have voltage.
My problem I cannot find where the wot relay is located.
Does anyone know where this thing is?
She was also having problems at certain rpms the motor would seem like it is missing for a sec or two.
The article I read said a bad wot relay would cause this.
Well, if there's no power at the low pressure cycling switch, there will never be any at the compressor clutch since the cycling switch, in addition to other components, must pass power to the PCM as it is one of the PCM's required inputs to enable the compressor clutch.
Start by checking the VT wire at the HIGH pressure switch with the A/C system controls turned on. Power has to go through that switch to get to the low pressure switch and then to the PCM. Follow the circuit, one step at a time....
Got fire to the low pressure switch the 40 amp fuse was bad.
But now I do not have power to the ac clutch. I can run a hot wire to the ac compressor and it engages but it quits when I take the wire off.
Does the wire from the low pressure switch go to the ac clutch? When I changed the compressor the plug had been broken and the wires were just connected. I put a pig tail on it but am not sure if it matters how the hot wire is connected. Does any one out there have any idea which way the wires should go?
Got fire to the low pressure switch the 40 amp fuse was bad.
What was the fuse number? The only "40 amp fuse" in the EATC system is the one that runs the blower motor, it would have nothing to do with getting power to the pressure switch circuit.
Does the wire from the low pressure switch go to the ac clutch?
No. Refer to the diagram in post #4. It's an input to the PCM.
When the PCM is happy with all its inputs, there is a valid request from the EATC module, and there are no inhibiting faults, the PCM will energize the A/C clutch (WOT) relay in the underhood fusebox by grounding relay pin 1 which is supposed to route power to the compressor clutch.
I believe it was 105 the one that also controls the air flow system on the panel. It only blew air through the defroster it would not change to any other setting.
I have it coming on now but I have to keep the rpms up. When it idles down the clutch cuts out then when you depress the fuel it comes back on.
F105 only supplies power to the blower motor (with the return through the BSC module) when the blower relay is energized. It does not supply power to anything else.
When it idles down the clutch cuts out then when you depress the fuel it comes back on.
That can be "working as designed" but additional data is needed. You have to understand how the system works, what the inputs and outputs are, and use test equipment as needed. Other than that, it's a guessing game.
