I will have to check that out. Vacuum seems just fine to me. Probalby a sensor. As for the 134, when I had it going before the last leak, it cooled just fine with 134 even in a 90+ day. I did change out the expansion valve etc also.
Tyler Backman wrote: > Have you checked all of the pins on your climate control with a > multimeter per the instructions on > http://userweb.windwireless.net/~jimc/mamerepairs.html? > Some of the instructions are wrong for later model 190Ds, but for > anything pre-87 I think they should be correct. > > Since your heater vale closes unless the dial is all the way to "min" > I would suspect one of the temperature sensors telling the control > unit it is colder than it actually is. Putting it all the way on "min" > overrides the temp sensor input, and shuts the heater off no matter > what. > > Have you checked the vacuum at the heater valve? My 190D was running > the heater valve open while running the AC because of a vacuum leak > which prevented it from closing all the way (full vacuum to the valve > shuts it off). I tested all of the electronics with a multimeter, and > they were all functioning correctly. Since I live near LA where I > basically never need heat, I ran a permanent vacuum line from the pump > to the heater valve, and now the AC works perfectly. If for some > reason it did get cold (which it won't- ever) I could just put it back > the way it was in 10 seconds. I'll probably fix it *properly* before I > drive up to visit family in the colder(er) pacific northwest. > > Why are you using R134a instead of R12? The stock AC systems on 190Ds > are weak enough as it is with R12, I doubt they would ever work well > with R134a, especially in hot/humid climates. My AC system works > really hard to keep the car cool with R12.... I had to wire the dual > electric fans to run constantly on the condenser, and I shut off the > AC system when I am stopped in traffic because it stops blowing cold, > and the motor starts warming up. > > Sincerely, > Tyler William H Backman > 1987 190D Turbo Biodiesel > > On Sep 25, 2008, at 4:44 PM, Kaleb C. Striplin wrote: > >> Well, the AC saga continues. I had to have the manifold hoses >> rebuilt, >> installed them yesterday. Pulled a vacuum for 2 hours, then let it it >> sit all night and day till this evening, still holding vacuum at same >> level. Put a little 134 in it, sniffer did not see any leaks. Fully >> charged and it worked of course. Will see how long it holds. >> Before it >> leaked out overnight. That was when I found the leak in the front >> compressor seal. Or so I though. Replaced the compressor, same leak. >> Thats when I found the pinhole in the hose, right by the compressor. >> The other compressor probably was not leaking at all. >> >> I also noticed that after a while of running, the heater valve opens >> back up unless you have the dial all the way to min. Anybody know >> anything about these 201 climate controls? Wonder if its a sensor >> somewhere or the control unit. I also dont seem to get much air out >> of >> the side vents but do out the center just fine. >> -- >> Kaleb C. Striplin/Claremore, OK >> 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 89 560SEL, >> 87 300SDL x2, 86 300E, 85 380SE 5.0 Euro, 85 190D, >> 84 190D, 84 300D euro manny, 81 240D, 80 240D, 76 240D, >> 76 300D, 72 250C, 69 250, 66 220SEb >> http://www.okiebenz.com >> > > > _______________________________________ > http://www.okiebenz.com > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > ------------------------------------------------------------------------ > > > No virus found in this incoming message. > Checked by AVG - http://www.avg.com > Version: 8.0.169 / Virus Database: 270.7.3/1693 - Release Date: 9/26/2008 > 7:35 AM > -- Kaleb C. Striplin/Claremore, OK 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 89 560SEL, 87 300SDL x2, 86 300E, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro manny, 81 240D, 80 240D, 76 240D, 76 300D, 72 250C, 69 250, 66 220SEb http://www.okiebenz.com _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
