Summer is coming...A/C Compressor clutch won't engage with cabin switch...
#1
Summer is coming...A/C Compressor clutch won't engage with cabin switch...
....but if I ground a certain red wire with a yellow stripe, it works. Pic here:
According to my manual, I think it's the pressure cutoff switch connector:
I've checked the relays in the box:
I'm half-tempted to run a toggle to my cab, but I think the thing wouldn't cycle when in use.
Any suggestions?
According to my manual, I think it's the pressure cutoff switch connector:
I've checked the relays in the box:
I'm half-tempted to run a toggle to my cab, but I think the thing wouldn't cycle when in use.
Any suggestions?
#2
RF Veteran
iTrader: (1)
2003 Ranger
Its the high pressure switch(in wiring diagram), Black/white wire is a Ground, red/yellow wire runs to the next pressure switch, low or cycling pressure switch, then a black/yellow wire from that switch runs to the PCM, pin 86
When both pressure switches pass the Ground to PCM then when you turn on AC that Ground is used to close the AC compressor clutch relay.
If clutch doesn't engage at all then that high pressure switch could be bad, if it cycles on and off then could be low on "Freon" or there is a blockage causing too high a pressure in the system
Switch can be changed without "opening" the system
If its a blockage you can "exploded" a line/connection or ruin compressor, if you bypass the switch, i.e. ground it manually
Best would be to get pressure gauges to test system
Its the high pressure switch(in wiring diagram), Black/white wire is a Ground, red/yellow wire runs to the next pressure switch, low or cycling pressure switch, then a black/yellow wire from that switch runs to the PCM, pin 86
When both pressure switches pass the Ground to PCM then when you turn on AC that Ground is used to close the AC compressor clutch relay.
If clutch doesn't engage at all then that high pressure switch could be bad, if it cycles on and off then could be low on "Freon" or there is a blockage causing too high a pressure in the system
Switch can be changed without "opening" the system
If its a blockage you can "exploded" a line/connection or ruin compressor, if you bypass the switch, i.e. ground it manually
Best would be to get pressure gauges to test system
Last edited by RonD; 04-19-2019 at 11:15 AM.
#3
Good info if it's a blockage. Thanks, Ron.
Other mentions...
When it stopped working, it didn't cycle at all.
This has been a chronic problem from just before my meltdown with the timing chain. I went to a mechanic to troubleshoot when it was still running.
I had the guy vacuum test my system. It took three hours, but it was good to go on that. I also had a switch (might have been the HP switch) replaced because that's what he thought, too.
The refrigerant was recharged back then, too. I rechecked it, and the pressure is still good as of last weekend.
I get super cold A/C when I ground the wire because the clutch now turns the compressor.
I'm thinking I should change the LP switch (and old connector, too...corrosion from being exposed for over a year) just for fits and shiggles
Other mentions...
When it stopped working, it didn't cycle at all.
This has been a chronic problem from just before my meltdown with the timing chain. I went to a mechanic to troubleshoot when it was still running.
I had the guy vacuum test my system. It took three hours, but it was good to go on that. I also had a switch (might have been the HP switch) replaced because that's what he thought, too.
The refrigerant was recharged back then, too. I rechecked it, and the pressure is still good as of last weekend.
I get super cold A/C when I ground the wire because the clutch now turns the compressor.
I'm thinking I should change the LP switch (and old connector, too...corrosion from being exposed for over a year) just for fits and shiggles
Last edited by cliffdog2004; 04-19-2019 at 01:32 PM.
#4
#5
RF Veteran
iTrader: (1)
Yes, which is which is confusing on pressure switches, lol
On Rangers the high pressure switch is also cycling switch and is on the passenger side on the drier/receiver
The low pressure should be on the IN line for the compressor, so near compressor
On Rangers the high pressure switch is also cycling switch and is on the passenger side on the drier/receiver
The low pressure should be on the IN line for the compressor, so near compressor
Last edited by RonD; 04-19-2019 at 02:15 PM.
#6
My problem is a little different, but since Ron D. is on the case i will hijack this post.
My compressor gets power to engage but sticks at anything above 60 degreees outside, If i smack the clutch with a screwdriver handle of something it will engage for awhile but sticks again after a few miles or cycles. i've cleaned up the clutch with brake cleaner and compressed air that helped a little but it still does it.
I have a bid of about 800 to replace the compressor as evidently they don't make a clutch replacement kit.
any other suggestions?
My compressor gets power to engage but sticks at anything above 60 degreees outside, If i smack the clutch with a screwdriver handle of something it will engage for awhile but sticks again after a few miles or cycles. i've cleaned up the clutch with brake cleaner and compressed air that helped a little but it still does it.
I have a bid of about 800 to replace the compressor as evidently they don't make a clutch replacement kit.
any other suggestions?
#7
Re-hijacking my thread
For anyone's info, the part numbers for these switches are YH592 for the canister mount and YH1705 for the compressor mount.
Local parts places have generics for cheaper, but a 90-day warranty is typical.
These stock Motorcraft lasted almost 15 years on my rig. That's for me.
*edit*
YH592 fits:
2001-2003 with 4.0L SOHC
I only noticed this because it was next to my engine...check to make sure it's also for yours
1997-2000 with 4.0L OHV
A lot of the 2.3L and 2.5L
Even the 3.0L. Pretty common over all of Ford.
YH1705 fits:
2001-2011 with 4.0L SOHC
Double check this too for these.
Up to 2011 with 2.3L
A lot of the 2.5L
3.0L too, but double check.
I can only confirm my 2003 4.0L
For anyone's info, the part numbers for these switches are YH592 for the canister mount and YH1705 for the compressor mount.
Local parts places have generics for cheaper, but a 90-day warranty is typical.
These stock Motorcraft lasted almost 15 years on my rig. That's for me.
*edit*
YH592 fits:
2001-2003 with 4.0L SOHC
I only noticed this because it was next to my engine...check to make sure it's also for yours
1997-2000 with 4.0L OHV
A lot of the 2.3L and 2.5L
Even the 3.0L. Pretty common over all of Ford.
YH1705 fits:
2001-2011 with 4.0L SOHC
Double check this too for these.
Up to 2011 with 2.3L
A lot of the 2.5L
3.0L too, but double check.
I can only confirm my 2003 4.0L
Last edited by cliffdog2004; 04-22-2019 at 09:52 AM.
#8
I found my old thread.
Yes. Ron. Blockage.
After I had an AC place evacuate the R134A out of the system, I replaced the orifice tube...this little sucker: https://www.rockauto.com/en/catalog/...fice+tube,6936
...cleaned out (as best I could) where is slips into, and put it all back together.
Went back for vacuum test and recharge...
Cold A/C again
Only took me a year
Yes. Ron. Blockage.
After I had an AC place evacuate the R134A out of the system, I replaced the orifice tube...this little sucker: https://www.rockauto.com/en/catalog/...fice+tube,6936
...cleaned out (as best I could) where is slips into, and put it all back together.
Went back for vacuum test and recharge...
Cold A/C again
Only took me a year
#9
I found my old thread.
Yes. Ron. Blockage.
After I had an AC place evacuate the R134A out of the system, I replaced the orifice tube...this little sucker: https://www.rockauto.com/en/catalog/...fice+tube,6936
...cleaned out (as best I could) where is slips into, and put it all back together.
Went back for vacuum test and recharge...
Cold A/C again
Only took me a year
Yes. Ron. Blockage.
After I had an AC place evacuate the R134A out of the system, I replaced the orifice tube...this little sucker: https://www.rockauto.com/en/catalog/...fice+tube,6936
...cleaned out (as best I could) where is slips into, and put it all back together.
Went back for vacuum test and recharge...
Cold A/C again
Only took me a year
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