dsm482

ok
i jumpered it.. i got a click ..

then i did resistance pin 3 to battery 3.6 ohms..
pin 5 gets 12v to battery .. almost blew my meter .. it actually survived resistance on voltage..

dsm482

so its neither ... wtf... I got freon.. not the relay, i swapped it.. hmmm

thermo protector shoud have resistance between for sure? thats right you said fans come on.... hmm both fans run

ezone

Ok start engine turn AC on
Do fans run?
Does compressor click on and clutch spins?

EDIT put relay back in first

ezone

EDIT put relay back in first


You said you swapped relays a while ago....if you didn't know where it was, did you swap wrong relays?

dsm482

wtf , you know something i dont about this issue..


everything runs, fans and compressor also kicked in.. it works?


no i swapped the right one.. i just got confused with the yellow color

ezone

wait til it quits again.....then get out and beat on the (correct) relay.

dsm482

relay sticking , i swapped it cant remember if i put it back the way it was

dsm482

i am impressed , i would have been chasing this forever.. i still have to isolate one wire for the thermo protector , maybe i can do it without taking it apart.. from above .. afraid it will short out..

ezone

You didn't know where the clutch relay was.
Which relays got swapped if you didn't know where the clutch relay was?

dsm482

i looked at the snowflake sign it was number 2.. look at the pic i send.. two snowflake.. two relays one on the bottoma has snoflake and radiator fan.. so i swapped both.. i might have put it back ..

ezone

Liquid electrical tape

dsm482

so issue is relay sticking ?

ezone

Best guess: Maybe.

You won't know for sure until it can be proven........Wait until it quits, then tap on it and see if that makes the system work again.


If you stuck a bad relay in the hole for one of the radiator fans, you may end up with a fan that doesn't run when it should.

dsm482

it quit..i got out beat it .. nothing.. measure voltage pin 3 13 v, measured resistance thru pin 5 5 ohms.. but i was driving ... swapped relay with headlihts, its not the relay, same relay kicks the headlights on roght away...

then went to the gym since this happen on my way to the gym and i pulled over to see ... after the gym fired car back up, ac working..
driving back home it quit.. restested voltage and resistance same..
i tested the pin 3 resistance to coil while car running also it was bouncing around since its spinning..

it has to be a controller, or the ecu... if its a wiring issue it wont work and go back..

so am thinking do there cars have separate ecu for ac?

ezone

No, it's not.

Your fans were still running when the AC quit cooling, the problem is between the clutch relay and the clutch.



Should have been very steady. The field coil cannot spin. Nothing electrical there spins.

This sounds like it should be your problem. Verify that resistance HOT goes sky high.



Sure it can. The field coil is one really long length of fine wire to make an electromagnet....and is now affected by temperature.

dsm482

well it bounced between 0 and higher resistance i will verify again.. i thought pcm.. u might be right.. i will re-verify when car hot.

by spinning i meant car running it what effects resistance...

i car shut offf, and warm, resistance is steady at 5 ohms.. as it cools down drops to 3.6 ohms.

ezone

How large is the air gap between clutch plate and the pulley face?
How far does the outer plate move inward when it clicks on?

Spec is .5mm, does yours look like about double that or more?

dsm482

i havent measured that yet..

ok i car cooled off, measure resistance at pin 3 , 3.6 ohms..

started car, measured resistance at 55 ohms.. recalibrated my fluke for leads, still 55 ohms with car running.. put the relay in.. BAM AC works and compressor..

pop in the car drove it till it quits, few miles..

came back took relay off car running measured resistance pin 3 , still 55 ohms..

jumpered pin 5 to pin 3 , sending 12 volts to it.. to make it click or run.. nothing.. still offf... shut the car of did the same thing, i hear it click..

whats the measurement for the clutch and where do i measure..? how do you measure it , make it click in or when its out?

and fans run normal all the time

ezone

To actually measure gap, I use a dial indicator....because a used clutch and pulley are not flat and a feeler gauge becomes inaccurate.

8th gen:

dsm482

thats nice i dont have one.. i got everything else,.. and every job i had they had their own dial indicators.

i might have the indicator but not the magnetic set up.. let me dig and find out

ezone

Why feelers are inaccurate when attempting to measure USED parts, worn surfaces are not flat:

ezone

Eyeball the clutch plate outer ring while clicking it on and off.....How far does it look like it moves?

dsm482

am not a lot, kinda hard to tell, if its withing spec.. am gonna go to autozone see if i can rent a dial indicator..

ezone

You could push on the plate with your dingers and see......

If it looks excessive you ciuld pull out one of the adjustment shims

dsm482

ok, i did not get a dial indicato but i had a feeler gauge.. it will fit in even engaged.

thats .514mm gauge .. another thing i noticed i can spin it by hand when engaged..

just as i can spin it when disangaged.. that tells me i got warn clutch..

can i adjust this more in with the shims..? its adjustable?

I measured the outside ring right where the dial is at the edge on outside...

where the shims are on the traingle i also have bigger gap than .5mm

ezone

You mean you can stuff feelers in whie it is powered up, not engaged. If it were engaged there would be zero gap.

Or you arent in the correct area

dsm482

no i can stuff gauges on the outside rim when engaged.. power to it.. buy jumpering pin 3 &5.. clutch pulled in...

i can also spin it by hand then too. yes i realize there should be no gap then...
..

dsm482

i figured it out air gap is too big..

i need to find clutch holding tool for the three holes, and tighten the bolt inward.. whlie measuring air..


I need to know min i max AIR GAP OEM spec... autozone lists min at 0.35mm to max at 0.65mm.


their rental tool couldnt fit in my three holes to hold the clutch down..

dsm482

freaking clutch hold down tool is what i need.

ezone

If you can spin the outer plate by hand, then it is not engaged nor pulled in.

When the electromagnet is energized it pulls on the outer plate, which should then be pulled tight against the belt driven pulley. That's the loud click when the compressor engages.. If it is pulled tight against the pulley, it should be coupled with the belt driven pulley.


Either there is far too much air gap or the electromagnet is not working (or weak)

Power it up (assuming the clutch does not click on) and see if a screwdriver is attracted to it?


No special tools for this one. Adjustment is done using little thin round shims between the clutch hub and compressor shaft.
Remove shim(s) to decrease clearance as needed.