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Old 07-20-2013, 01:21 PM
PerkHouse PerkHouse is offline
Brian Perkins
 
Join Date: Aug 2006
Location: Luanda, Angola
Posts: 135
Question W123 300DT A/C idler pulley?

Hi guys,

Long time... i've been in China for 10 months riding my bicycle and electric scooter (I love that thing!), but I just got home to work on my baby (300D) some more. I completely rebuilt the A/C last summer, but shortly after I left for China, my daughter reported that the A/C quit working. When it got colder outside, she also told me the heat didn't work. Now that I'm back I've discovered that the climate control is completely dead and I suspect the wiring harness to the ignition as the culprit, but that's not the reason for my post.

Out of curiousity, I popped the hood to check the static pressure on the refrigerant to see if there were any leaks and was glad to see it was right where I left it 10 months ago. However, I noticed that the A/C belt is extremely loose (about 3/4" maybe even 1" of play) and the adjuster is maxed out. Confused, I wondered if maybe I missed something last summer when I happened across an advertisement for a replacement A/C idler pulley (MB 116 130 04 60). However, the old A/C system on my car didn't have an idler pulley, but that would certainly explain my loose belt.

Do any of you guys with early-mid 80's 300D's have an idler pulley on your A/C belt???
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