Air conditioning help please.

lshobie · 08-14-05, 04:00 PM

Hi Guys/Gals,

Just trying to get my a/c up and running on my 89 BJ74. The system has pressure, the compressor turns, belt is tight, i can hear teh relay click under the dash, teh fuse is good, but the compressor doesnt seem to kick in - low pressure cut in switch?

ANy suggestions or experience with these things?

Thanks

Louis

cruiser_guy · 08-14-05, 04:08 PM

Is the fan on?? The fan must be on (it probably is if the relay is clicking) or the system doesn't work. There is a low pressure switch but it's in the evaporator box on the '60 (not sure on the '74 series) making getting to it a pain in the butt.

The other, more likely, possiblity is a bad fan clutch and/or incorrect spacing on the fan clutch.

Stone · 08-14-05, 06:52 PM

Did your problem just come up suddenly, and didn't worsen over time?

Mine just started blowing warm air one day, and with a little bit of help, found that the problem was the stator coil in my AC compressor. The FSM goes through the diagnostics of this, but basically, there is one lead coming from the compressor (black wire with a plug), and this wire should see a specific number of ohms to ground. Mine was infinity, so the stator coil wasn't engaging the magnetic clutch to turn the compressor. An easy way to see this is to have your engine idle, turn on your AC, and see if the pulley on the compressor starts to turn.

More on this thread:
http://forum.ih8mud.com/diesel-tech-24-volts-systems/41234-13bt-ac-compressor-question.html

lshobie · 08-14-05, 09:37 PM

Excellent info - thanks guys. I'll get at it tomorrow.

I am working on a truck I just brought in, it is a decent rig, but needs some fine tuning.

Regards

lshobie · 08-17-05, 06:27 PM

HI Guys,

I put power to the compressor and the clutch engaged - so it's good and there is no power to teh compressor.. I then looked at the VSV and it had a hose off it and the idle up hose was attached to the wrong pipe, so I fixed those. Then I checked the pressure switch - it is blown from what the multimeter tells me.

So, are pressure switches available at the dealer? anyone have a part number? Any suggestions?

Regards

08-14-05, 04:00 PM	#1
lshobie IH8MUD Lifer Join Date: Feb 2004 Posts: 1,859	Air conditioning help please. Hi Guys/Gals, Just trying to get my a/c up and running on my 89 BJ74. The system has pressure, the compressor turns, belt is tight, i can hear teh relay click under the dash, teh fuse is good, but the compressor doesnt seem to kick in - low pressure cut in switch? ANy suggestions or experience with these things? Thanks Louis __________________ Louis Check out my youtube videos at: www.youtube.com/lshobie Join the True North Toyota Land Cruiser Club in Ottawa http://landcruisers.ca/

08-14-05, 04:08 PM	#2
cruiser_guy IH8MUD Lifer Join Date: Jan 2003 Location: Mixco, Guatemala/Cranbrook & Vancouver, B.C., Canada TLCA# 16387 Posts: 7,362	Is the fan on?? The fan must be on (it probably is if the relay is clicking) or the system doesn't work. There is a low pressure switch but it's in the evaporator box on the '60 (not sure on the '74 series) making getting to it a pain in the butt. The other, more likely, possiblity is a bad fan clutch and/or incorrect spacing on the fan clutch. __________________ '82 BJ60 H55 tranny, AXT turbo 3B diesel, high nickel alloy head, A/C, BDS lift, factory PTO, Aussie rear locker, OEM LSD front, 4:11's, 32's, PERFECT frame! '76 FJ55, 3B turbo, alloy head, H41 tranny, 3 sp. transfer, 33's, A/C, PTO winch, long range tank! '67 FJ45LV shop project c/w 3B turbo diesel transplant & H41 4 speed, 3 speed transfer, PTO! www.wirrell.com

08-14-05, 06:52 PM	#3
Stone IH8MUD Lifer Join Date: May 2004 Location: BC, Canada TLCA# 13772 Posts: 1,992	Did your problem just come up suddenly, and didn't worsen over time? Mine just started blowing warm air one day, and with a little bit of help, found that the problem was the stator coil in my AC compressor. The FSM goes through the diagnostics of this, but basically, there is one lead coming from the compressor (black wire with a plug), and this wire should see a specific number of ohms to ground. Mine was infinity, so the stator coil wasn't engaging the magnetic clutch to turn the compressor. An easy way to see this is to have your engine idle, turn on your AC, and see if the pulley on the compressor starts to turn. More on this thread: http://forum.ih8mud.com/diesel-tech-24-volts-systems/41234-13bt-ac-compressor-question.html __________________ Stone's Land Cruiser & Flyfishing Pics Flyfishing British Columbia: www.flyfishbc.com bcfishingreports.com

08-14-05, 09:37 PM	#4
lshobie IH8MUD Lifer Join Date: Feb 2004 Posts: 1,859	Excellent info - thanks guys. I'll get at it tomorrow. I am working on a truck I just brought in, it is a decent rig, but needs some fine tuning. Regards __________________ Louis Check out my youtube videos at: www.youtube.com/lshobie Join the True North Toyota Land Cruiser Club in Ottawa http://landcruisers.ca/

08-17-05, 06:27 PM	#5
lshobie IH8MUD Lifer Join Date: Feb 2004 Posts: 1,859	HI Guys, I put power to the compressor and the clutch engaged - so it's good and there is no power to teh compressor.. I then looked at the VSV and it had a hose off it and the idle up hose was attached to the wrong pipe, so I fixed those. Then I checked the pressure switch - it is blown from what the multimeter tells me. So, are pressure switches available at the dealer? anyone have a part number? Any suggestions? Regards __________________ Louis Check out my youtube videos at: www.youtube.com/lshobie Join the True North Toyota Land Cruiser Club in Ottawa http://landcruisers.ca/

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