Check part 7-4502 at autozone. I guess I should have stated it is an aftermarket part.



Looks PF to me.

Attached Thumbnails

 

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

When I Google search parallel flow that looks like the same serpentine condensers that are stock.

I found a used vacuum changeover unit for $21 since a new one is $160!

Should be here this weekend so maybe that will help.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Did you test your original change over unit? How would you know if it's bad or not? I have an extra one, but my original seemed to be ok so I never put it on. Please post the results after you get everything back together to see if it helped.

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1990 190E 3.0L

Well the defrost vents stay open during A/C so I get a ton of airflow straight onto the windshield.

I checked all the vacuum pods with a Mityvac and they all hold vacuum (which they should since they are only a few years old). So if the vac pods are good, it has to be the vacuum bypass/control unit, OR the climate control unit. BUT in the winter my vacuum bypass/control unit it emits a high pitch frequent click that goes incessantly so I suspect its related.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

The pic is parallel. .. The item may not be...

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!