My 1988 190E is fitted with the three-rotary-knob setup below the blower and A/C switches on the centre console. I had a blown globe issue so I dismantled the console to sort the globe. That was easily sorted, but I discovered that the plastic square peg that joins the RH heat knob metal shaft to the heater box has sheared, meaning that temp on that side of the car cannot be selected even though the knob still turns through it's temp settings.
The plastic peg is a long black rectangular part with two articulated plastic joints at the heater box end which join to the heater box control with two round discs. The back of the rotary knob is inserted into this hollow square plastic peg via a corresponding square section metal shaft in a ball joint setup allowing for rotary movement.
Does anyone know if this plastic peg is serviced as a spare by MB and how is it removed from the heater box? Cannot find any info online only info on the climate control switch pack which mine doesn't have. Nothing in manuals either...
I may have to come up with a fix of my own...
Cheers...

I'd try a junkyard or ebay for a donor module. Otherwise, when plastic parts break at stress points like that, I've had good luck reinforcing with steel wire and then copious amounts of CA glue. Post a pic!

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition

A pic will definitely help, are there any part numbers for the items that you're looking for? If so, please provide them and we can follow up with you if there's a match.

To the best of my knowledge the parts behind the knobs are all on one whole piece that is "meant to be" replaced as a whole.

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!