DIY Fix for A/C not working or intermittent, windows fogging up (caused by bad SAM) - Page 5 - Mercedes Benz SLK Forum

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#81 Old 03-18-2019
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Good on ya. Same as mine, the old caps looked new but since the upgrades with the new caps I've never looked back and it's probably been 15k or more since then!
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#82 Old 4 Weeks Ago
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Hi all.

I'd like to thank everyone that has contributed to this thread, as I repaired my a/c following your instructions, but I'd like to add some info that can also be helpful to others:

I bought the car without noticing any fail on the a/c as it was cold the day I test drove it, but noticed it very soon. I was so pissed off until I read this thread. I have some basic mechanical and electronics skills, so I ordered the capacitors (around 4 Euro) and as soon as I received them on Monday, I removed the front SAM and got hands-on. Replaced the capacitors. Found one of the 22 uF that was completely damaged (measured more than 200 u. I felt so happy thinking I got it fixed. It was around 10 at night I got back to the can and reinstalled the SAM. But nothing changed: Hot air blowing.

Yesterday I took the car to my friend's who has a multi-brand diagnosis tool. We scanned the car and found some faults. One of them was the well known "9000 component or the signal line to the component a9 (ac compressor) has open circuit or short to ground". I felt so happy again! It was going to work after clearing the codes.

Fail: I drove back home (25 Km = 15 miles) with hot air blowing... and very pissed off.

Today, after lunch, I drove her to work (25 Km = 15 miles), hot air blowing... windows down and sweating... and after I finished some paperwork I decided to visit an A/C specialized workshop. I started the car and opened the roof, because it was sitting at the sun and was very hot inside. I headed the highway and suddenly I realized that VERY COLD air was blowing...

It was the first time I opened the roof. Still went to the workshop to grab their opinion. They say this car has some kind of temperature compensation when the roof is opened... but they don't know if can be related. We closed the roof, started the car: cold air. Stopped the car, started it again... And it still blowed cold air.

I drove back home another 25 Km with freezing air blowing!!

Does this make any sense? Not to me, but I'd appreciate your opinions.

Again, thank you all contributors. I think I finally did it, and I have that nice feeling when you solve this kind of issues yourself...
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#83 Old 4 Weeks Ago
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You need to post up all the codes the car had. I would suggest clearing them all, letting them come back and then post them up. Given that the A/C does actually work my guess is it's a control issue or a switch issue - something like that.

Hopefully it will set a code that will help narrow it down.
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