Fans problem - please help diagnose

[PranK]

OK, so I reconnected my pressure switch, turned ignition on and A/C to LO and Auto.

No movement on the compressor.

Unplugged the coil and crammed my multimeter in it, no response at all. I even unscrewed the connector mount so I could look in and make sure the mm was making contact. Nada, Zip, Nothing.

So, I'm assuming a new coil is in order?

How do I remove the clutch plate? Manual says I need a special spanner (like an angle grinder spanner) - is there anything I can fab at home?

[JustCruisn]

You will need a pulley puller to get get it off the shaft.

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[JustCruisn]

The test with multimeter is for resistance you wanna see how many ohms it has. If is shows O.L or O.C indicating open circuit then you know it is dead.
Also test there is voltage at the connector to the coil just to be sure that it is being asked to operate.

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[PranK]

Ok I'll test both. Power supply to the coil and also resistance. Thanks

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[PranK]

Ok so power supply was 5.5v with ignition on but no engine on.

The resistance remained unchanged when i connected the probes. Tried several ohm settings and all stayed unchanged.

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[PranK]

Heres a question; I'm generally ok with buying replacement parts from HK but I usually get genuine parts locally. The car has entered a 'maintain' stage and with 240k's on it, its probably not worth spending top dollar on genuine when an HK version will still see me some 10's of thousands of kays.

Reckon the HK replacement is ok? (AIR A C Compressor Clutch Coil FOR Audi TT Quatro VW Jetta Golf SD7V16 CC 205BA | eBay)

[JustCruisn]

Holy **** that is cheap. If it fits and works then that is a plus, at least you can test is electrically without too much work.
There must be a reason it is so cheap, it is your risk however. If you are not too worried about the time to do the install again if it fails then go for it.
I have had mixed results with parts from China. A window switch with green back light instead of red, and fan controller that went up in smoke and was about 1/2 the weight of the original. And some other bits that were just fine engine mount some suspensions bits another window switch.
I don't know the dimensions of the part, you could take some rough measurements.

Way back in 2011 when mine failed VW wanted $757 for coil or $917 Compressor
Coil part number 1J0 820 811M

I got the coil from ebay/UK. allforauto on eBay $178.50
but it included the housing/pulley and clutch plate etc.

About 4 years later my compressor died and I sourced a new one locally for $350, including the coil. I was planning to remove the coil but forgot and it went out in the trash. You could of had that for free, sorry.

BTW 2-4 ohms is what you want to see on the coil. 5.5v is the correct voltage to engage the coil.

[PranK]

There's a couple of local used compressors for 1-2 hundred on eBay. I just don't know if you can trust it... Especially for something like the could which I'm assuming you'd get no "Telltale signs" from before failure.

I might just go for one from UK. I just don't want to do this again.


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[PranK]

God int'l shipping is a killer.

That eBay user has the same kit that I suspect you bought; VW Jetta AC Compressor Clutch Repair KIT 2001 2002 2003 2004 A C City Bora | eBay

Looks pretty good, and still $160ish delivered. It's from the states.

I just confirmed I have the Sanden SD7V16 1233 which I'm sure you knew already.

I'm really appreciative of your help, thanks again.

[PranK]

So I ended up going with the Chinese one to give it a go. WHen it arrived I checked the resistance and it was spot on.

Unfortunately when I fit it, there is no difference in the fans or a/c. The centre of the compressor does not spin and the fans do not come on.

Interestingly, when I checked error codes, those for the pressure switch were gone. SO maybe I fixed something, but not the exact issue.