This is great.:thumbsup:

 

good show!

With any troubleshooting procedure, start with the basics, then move forward. As you correctly point out, insure all the physical elements are nominal (vacuum, blower, heating). Each of these are the subject of future troubleshooting guides.

On the two-function pressure switch, I was under the impression there was a schrader valve underneath which would allow for the sensor (switch) to be removed without loss of refrigerant. Seems like I researched this many moons ago during trouble-shooting my system, but I could easily be mistaken. I have replaced a pressure switche on a Ford Ranger, and it did have a schrader valve underneath. Screwed out the old, screwed in the new without loss.

I am trying to get together some of my notes to augment this trouble-shooting thread. I had a procedure for testing the push button unit, but can't find it (been looking ever since this subject came up). If/when I find it, I'll gladly post.

Thanks for your article. It is part of my collection now...

 

On the two-function pressure switch, I was under the impression there was a schrader valve underneath which would allow for the sensor (switch) to be removed without loss of refrigerant.

Thanks, for the feedback, Ears. I wish you were right about those switches on the receiver-drier, sure would save a lot of trouble if a system was operating correctly except for a faulty freon pressure or temperature switch.

To check, I pulled out a new, spare receiver-drier I have. I believe it just has plain, female, threaded holes where those switches go. There are factory-installed plugs in them right now, and I don't want to pull them out lest the desiccant start to absorb humidity, but I can't see any sign of a Schrader valve, which are male. But I won't know for sure until I install it.

Sure you weren't thinking of the service ports? Those are the only Schrader valves I've come across on automotive AC applications; but then I've only worked on European cars' AC systems.

Have a look and see if this appears the way you remember. Thanks again, bud.

Good road,

 

Any climate control thread would not normally interest me........however, your tutorials are ALWAYS worth reading.

Good Job Mr Good Road.

 

Fine job as usual, GA.
You are a professional writer?

 

Thanks, dugald. I'm really not a professional technical writer. But I pretend to be one at work!

Good road,

 

Great job Ga. How about somebody make everything Ga writes up a thread its that good.:thumbsup:

 

I've completed the final version of this tutorial and replaced the draft version with it at the first post. This final version corrects a few minor typos and adds one additional diagnostic test.

Thanks for the suggestions and comments. And best of luck with your repairs!

Good road,

 

I've got a 1978 450slc.... do you think I could use this to help diagnose my problems with my automatic climate a/c?

 

Sorry, bud, the two systems are miles apart on design, and I've never used, let alone worked on, the Chrysler-designed system your SL employs.

That said, the R107 knowledge and experience pool here is deeper than just about anyplace I've ever seen, and I'm sure if you describe the climate control issue your car's having someone will have an answer.

A good place to familiarize yourself with troubleshooting your Automatic Climate Control (I? II?) system is here.

Good road,

 

Any suggestions as how/where to get a Klima relay without spending $100?

 

Here's a used one on e-bay for less than half that. The part number, 002 545 18 05, is the one needed to build the diagnostic harness.

Good road,

 

No Relay

I have a 1986 560Sl brought by in the spring. The ac system is electrically dead, no power at any switch, so I followed you great post on checking the relay. After removing the glove box, to my surprise, no relay to be found. Is it possible that the relay may be somewhere else on the 86. I checked the passenger side footwell and around the fusebox but no joy. I did not find a place where a relay may even be plugged in. Help would be welcome. It was 104 yesterday.

 

Same place.
http://www.benzworld.org/forums/r-c107-sl-slc-class/1460113-components-locations-acronyms-pics.html

 

Found it. Thanks for the help. Now to continue on.

 

Klima II Tech Help

Wow , this is a GREAT Tech article .

I'm having basic no worky issues with the Klima II in my '84 W-123 , is there a file on that too please ? .

Just post the hyperlink and I'll do the rest .

THANX ! .