[Vwdiesel] 2000 TDI a/c question - and a brief description of

Bryan Belman dieselwesty at yahoo.com
Mon Jun 7 07:17:26 PDT 2010

With all the great e-mails these past few days, I need to do something about the AC in my 92 Eco Jetta.  I have a can of 134a and I know where to put it in thanks to Nick showing me when I stopped to see him on our way back up the coast from FL.

But, to learn more about the system, I want to do the measurments of PSI on the high side and low side before and after.
I do not think this gauge needed would be anything special for Automotive AC, so as long as I can get my diesel compression tester to properly connect to the high side nipple, that should work, yes.

For the lost side, I can use my normal gas engine psi tester, the one I use for beetle motors and stuff.

My Questions.
Do I take the PSI readings with the car cold or warmed up and running?

How much do I rev. the motor when putting in the 134a, about 2K

How will I know the can is empty, will there be condinsation on the outside to show or something like a propane bottle?


 Bryan Belman, Pt. Pleasant, NJ
04 Jetta Wagon TDI PD, 100hp, 5sp -- running :)
92 Jetta 1.6 Eco-Turbo Diesel -- running :}
82 Diesel Westy 1.9NA -- running :)
70 Type 1 stock Beetle -- Not running :( 

From: Val Christian <val at mongo.mongobird.com>
To: vwdiesel at vwfans.com
Sent: Mon, June 7, 2010 9:33:43 AM
Subject: Re: [Vwdiesel] 2000 TDI a/c question - and a brief description of

Don't measure AC performance by how far people move away from you when you arrive.

Put a thermometer in the air stream, on MAX AC, recirculating air.  After things stabilize, the air coming out should be below 40F.  On my 2003, it is usually 34F or 33F.  

If it's 50F or 55F, and the outside air is less than 90F, you definitely have a performance problem.

If it's running 35F and you're just getting very little air, then you may have a diverter not positioning itself, or a vacuum motor type problem.


> That's why VW Diesel owners are smarter:  not only can they fix the 
> system, they can give great, well-written descriptions of the system.  
> As far as being better looking as well, that's just a point of fact.
> I appreciate the explanations from all.  Combined with my rough 
> knowledge of the system and some half-remembered chemistry class 
> knowledge (I ran a supercritical fluid extractor in grad. school--forgot 
> about that), I think I have it.  Took me a few days to assimilate it 
> all, though.
> I always do worry about the big, catastrophically expensive parts like 
> compressors in a car with 267,000 miles, but I'll hope for the best.  
> Hope is cheaper.
> What seems to happen is that the airflow through the vents is reduced.  
> I normally run the system on fan speeds 1-2.  When the problem really 
> hit, I'd been driving almost an hour on recirculate and when I cranked 
> the fan to speed 4, all I got was a lot of noise and very little (but 
> cold) airflow.  Turning off the recirculate helped.  That was before the 
> added can of 134a, and I've not had to drive a lot since.  Tomorrow, 
> however, I'll have to make the same trip in even hotter weather.  I'll 
> let y'all know.  I'll also put on an extra layer of anti-perspirant, 
> just in case.
> -Shalyn
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