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Old 08-23-2017, 08:26 PM
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Join Date: Aug 2017
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1987 300SDL Evaporator Leak?

My friend's car leaks refrigerant and a mechanic tested it. He said it was leaking from the evaporator. Seeing as that is a bit of a job and someone stole a lot of my tools, I have looked for help online. I saw that some said it could be the expansion valve. Does that also require disassembling the entire dash or is it less work to get to it? Would it just need new rings? Any advice?

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Old 08-23-2017, 09:39 PM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 20,794
The expansion valve is above the accelerator pedal. Not much has to come off to get to it but it's an awkward reach. For the work involved, install a new good quality expansion valve rather than just new seals.

98 E320s sedan and wagon
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Old 08-24-2017, 08:50 AM
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Is it on the left or right side?
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Old 08-24-2017, 10:22 AM
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Location: Texas Hill Country
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The expansion valve is above the accelerator pedal next to the firewall. It is a BEAR to get to. There is a sort of crash "cage" thing in your way to get at some of the fittings, removing the bolts that secure it allow you to move it out of your way. Have some crows-feet ready (17mm, 19mm, 22mm), plenty of swear words at the ready, and be prepared to do some contortions.

The job isn't difficult, it's just the access that's a SERIOUS PAIN! Start to finish, the job should take you about 90 minutes.
'11 Honda Accord EX - "The Daily" 70K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "Diseasel Jr." 173K
'94 BMW 525i - "The Red Car" 180k
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Old 08-24-2017, 11:15 AM
Diesel Preferred
Join Date: Oct 2007
Location: Charleston SC
Posts: 2,735
Ask the mech, they probably used a sniffer to sample the air from the center vents, in which case I'm highly doubtful that the leak is at the expansion valve.

M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC
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