A mity-vac will be very useful for figuring out things vacuum related. Does this car have the evil Chrysler servo ACC system? If yes, then the Unwired tools solution may be a good choice, if you have the $$. Pressing the defrost button on the control is supposed to cause four things to happen: Fan on high, heat on full, AC compressor on, and resulting heated/de-humidified air directed to the windshield.
-Max -----Original Message----- From: mercedes-boun...@okiebenz.com [mailto:mercedes-boun...@okiebenz.com] On Behalf Of Chris N John Sent: Wednesday, January 05, 2011 1:04 PM To: mercedes@okiebenz.com Subject: [MBZ] 1980 300 SD vac lines again! Well, I'm ashamed that after all the help you guys offered to try and resolve our vac issues that we are once again heating our car with the defroster fan this winter---- We tried various changes on the lines coming out of the firewall into the engine compartment. You may or may not recall, when we bought our car, it had several vac lines to the right of the brake unit just dangling and connected to NOTHING. We just don't know what all was changed or bypassed and why! Still would like to see pics of correct connections. I know there is an issue with the holding vac on the door locks. They lock fine but bleed off at various rates. Sometimes they won't all lock, but can be pushed down and will hold for awhile. Anyone out there still have a car like ours? I study the diagrams and seem to get more confused. Think we need a mighty-vac from the sound of things, also? Is it best to just change to new check valves or is there a way to test and see if they are good. They may even be installed backwards for all we know---- Guess it will be spring someday and then we will be worried about the AC that also doesn't work. And even though it hasn't started for 10 days cause its toooooo cold, we Love our car!!!!! Still not sure if that block heater is there, but we are going to check it out soon. We have a great old 72 ford bronco that gets us where we want to go in this weather! Thanks again everyone, Chris in NW Wyoming Found some perfect match vinyl and working on new upholstery, when I can fight off the urge to hibernate! _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
