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Old 05-15-2000, 10:08 PM
Registered User
Join Date: Jan 2000
Location: ny, ny
Posts: 112
I own 1987 190e 2.3
Fist of all,I must thank the mercedes shop staff, participants and helpful members for such a great forum.
I had a problem with my a/c, i kept getting alot of hot air thru the center vents as well as thw side vents. I meant it was hot and unbearable. None of the pust buttons worked, including the a/c button.
Now its almost summerttime and i dont know about u but when it hit the 90's there is no way to stay comfortable without some cold air or a cool breeze.
Anyway i posed my problem to mercedesshop and got some feedback.
You guy saved me a trip to the dealer, for a diagnostic.
Well let me say this you guy are "the best" sets of techs i have ever met.
A couple of mechanic in my neighborhood had been tryin to diagnose the probems for weeks.
Anyway it was a simple problem, i had a Vacum leak just like Benzmac, Larry, M.B.Doc, Lee, Steve, and others had been saying.
I went to Pepboys and got a small piece of vacum hose and Wahlah, i got cold air, all my push buttons worked and it got so cold i had to turn my a/c off and crack the windows.

Thank you
thank you
thank you

now only if u guys could help me to get a lil more horsepower out of my 190 2.3 1987.
I know about the sensor resistance but benzmac seems to be against that, he said it would interfere with your emmissions.

thanks for getting me back my

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Old 05-19-2000, 04:57 PM
Posts: n/a
I had my 2.3-16 valve converted to R-134 about a year and a half ago. I just had it recharged with 1.8 lbs of 134. In checking the output temp at the center vents, it read 40 degrees F. Before that, I thought it was overcharged and got a temp reading of about 46 degrees F. I cant wait to test it when the temp gets close to 95-99 degrees this summer. Thanks to Benzmac and all the other people on this site....
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Old 05-20-2000, 05:48 AM
spinedoc's Avatar
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Join Date: Nov 1999
Location: North Grafton, MA USA
Posts: 700
Can you post any details as to where this vent leak was? I am having the same problems with my 300E.


1987 300E
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Old 05-22-2000, 02:07 AM
Registered User
Join Date: Jan 2000
Location: ny, ny
Posts: 112
The leak was near the firewall, near the battery and if u look carefully u will see a red vacum hose. check the vacum hoses and any connectors on it to see if its leaking.

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