I had problems with my ac last summer and dont want to go through that again. The ac worked sometimes and sometimes it did not. When it was 80 or 85 it worked good, but any hotter out it was bad. Also when I first got in the car and started to drive it worked good then if I had to stop at a stop light it would stop working. The car was switched to 134, so where would be a good place for me to start? Any ideas would be great. Thanks.

A good place to start would be the diagnostics contained in the factory shop manual.

It's a complex system with many possibilities.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles

[quote=JimFreeh;2110548]A good place to start would be the diagnostics contained in the factory shop manual.

It's a complex system with many possibilities.

Jim[/

Where would I get the shop manual from?

I'd start by switching it back to R12.

Then I'd be sure the comp was still engaged after the cooling stopped. Then I'd look at the pressures if it stayed engaged.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

When I switch it back to R12 should I clean all the lines out first?

How do you tell if the compressor is still engaged when cooling stops?