Thanx Larry, I've got some LEDs laying round.

I read that thread, Holy Smokes!

Just to make sure we're using the same info, I just did some measurements

I did 5 Start - Restart Cycles and timed everything. Times are + or - maybe 5-10 secs. I first started the timer when I started the engine and then figured out that the compressor starts 5 secs later. But you'll get the general drift.

Ambient temp 88F
Resting Pressures Hi and Low 101#
1st start Engine Cold for 24 hours, all restarts are immediate

1st Start Low= 50 High=225 Compressor Cutoff=110secs No FAN
2nd Start Low=58 High=220 Compressor Cutoff=115secs Fan on
3rd Start Low=55 High=225 Compressor Cutoff=115secs Fan on
4th Start Low=58 High=225 Compressor Cutoff=110secs Fan on
5th Start Low=52 High=210 Compressor Cutoff=115secs Fan 0n

The aux fan usually triggered on at 45-60 seconds.

The compressor sounds a little noisy for the first 45 seconds after it starts then quiets down.

I can measure the air gap, just need to figure out where to take the measurement. I had cleaned the hell out of the motor to get it better to work on so the compressor is pretty clean. I can clean it some more though. The belt tensioner I can't really figure out how to get tensioned properly since I don't really see a pointer. I also don't notice the marks moving when you tighten the tensioner, even though the belt gets tighter.

If the belt is loose, it will feel loose. If it doesn't feel loose, meaning there is no movement of the tensioner arm when you pull on the belt, then consider the belt tight enough and move on.

Your pressure readings are virtually the same every time it trips out.

It would be interesting to have a voltmeter on the low pressure cutout switch and see if the voltage there trips when the clutch quits or if the voltage remains when the clutch trips. This would tell you if the CCU is giving up its signal or if the Klima relay is tripping. If the voltage remains after clutch cutout, then the CCU is still asking for compressor and the Klima relay or circuit is the culprit. If that is the case, an ice cube relay in place of the Klima should fix you up.

If OTOH the voltage at the low pressure switch goes away at clutch cutout, then the problem is in the CCU system, very possibly a temp sensor or temp sensor circuit.

Hmmm, I can pull the belt up and the tensioner moves some.

This is one of those things that's difficult to describe. If the tensioner is in good shape and properly adjusted you might get a very slight amount of movement. The key is feeling tension on the belt such that the belt is wrapped with full contact around all pulleys. If there is not enough tension such that the belt is not pulled down in full contact with the pulleys it is not correct.

Hope this helps

Ice Cube Relay
 

Hello,
I've looked and there's a lot of references to the Ice Cube relay to bypass the klima, but I can't find the specs for how to do it. Anybody have a PDF or anything that describes what it is and how to do it? I did a search on Ebay, and there's a ton of things called Ice Cube relays!

Thanx!

p.s. still workin' the problem here. It ain't grease though.