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#1
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A/C is not working
Hey guys can anyone tell me what can be wrong whit my A/C on my 84 300sd,all I know is that the system is not licking,what can be wrong?
any comments and inputs are very welcome. Thanks
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my hot rod http://www.youtube.com/watch?v=uiJ2YYIBxVs one more http://www.youtube.com/watch?v=79r9hn9aTuA and one more http://www.youtube.com/watch?v=1dKo1E-69f0 Sorry for my broken English! 1984 300sd 301000 MILE |
#2
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Quote:
Dave We really need more information than what you have posted.
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car |
#3
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Mercedes specializes in bad a/c's
If your a/c is not working, then all is well with your Mercedes. That's just the way they're made. Could be the regulator or the fan, or a myriad of other items.
On my W124, I can test the fan by replacing the regulator. If the fan works, then the original regulator was bad. If the fan doesn't work, then it could be the fan itself doesn't work, or other things causing it to not work. If you put power directly to the fan modules, circumventing everything else, then if the fan doesn't work, it's definitely the fan that's messed up. Get a new fan, repeat the process to see if the original regulator is working or not. Good luck, jeff 1991 300d, 105k |
#4
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Aux fan When does it come on?
When does the aux fan come on ? When the AC is switched on? When the radiator reaches a certain temp.? Where is the sensor located? Thanks in advance>
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'83 240D 264k on 100% biodiesel/ 31mpg 83 300D 217K the $800 gem '82 300D 267K the new WVO project car finished and driving for free International tractor B275 on B100 Ford 555 backhoe on B100 Sargent 25 ton Rough Terrain crane on B50 |
#5
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The fan kicks on by the temp sensor on the receiver/dryer. It should also be turned on by the coolant temp sensor.
Like was stated before try jumping power directly to the fan and see if it works. This however doesn't answer your original question. What are your high and low side pressures? Vacuum Diagrams danny
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1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
#6
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High and low side pressure? I thought all one had to do was go to Auto Zone and purchase the 134A parking lot install kit and let 'er rip. Who cares about pressure, exploding hoses and other casualties of hacking the AC system.
Maybe the belt is missing, maybe the compressor locked up and broke the belt, maybe there is a leak, maybe the fuse is blown, maybe the switches on the drier are bad, maybe you should take it to an indy who is capable to repairing MB AC systems. |
#7
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Might be the gold chain around the license plate. Oh wait... that's on your Mustang. That thing makes more noise than a nailing 617.
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#8
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Thanks for the replays guys,can anyone teal me what is the most coming problems whit A/C on this cars?
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my hot rod http://www.youtube.com/watch?v=uiJ2YYIBxVs one more http://www.youtube.com/watch?v=79r9hn9aTuA and one more http://www.youtube.com/watch?v=1dKo1E-69f0 Sorry for my broken English! 1984 300sd 301000 MILE |
#9
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The whole thing is bad
The whole a/c system is bad on a Mercedes. Bad fans, bad regulators, bad components, bad flappers, bad freon lines, etc. I think the lines on a Mercedes are metal, when the japs went with the better choice of aluminum. Jap a/c's will basically throw ice cubes at you, very good for here in the south. Mercedes, even when working well, just don't cool that well. Barely adequate.
MB should have offered a cheap fix for their poor design, but they never did. jeff |
#10
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Yea, At best mine Licks around 41-42 F out the vents.
Some suck more than lick. |
#11
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Quote:
The climate control system in my 91 300D will maintain the cabin temperature +/- 1 degree from the temperature setting on the dial. On a hot summer day it will also bring down the interior temperature from 125F to a comfortable level in 5-6 minutes. I don't see how you could expect much more, from a performance perspective, than this. Are the Japanese or American systems any better? If your system is not capable of this kind of performance I suspect something is wrong - no real surprise there eh? |
#12
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can anyone teal me where is the fan regulator located?
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my hot rod http://www.youtube.com/watch?v=uiJ2YYIBxVs one more http://www.youtube.com/watch?v=79r9hn9aTuA and one more http://www.youtube.com/watch?v=1dKo1E-69f0 Sorry for my broken English! 1984 300sd 301000 MILE |
#13
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Im the last guy to be giving AC advice but here are some simple first steps before you go buying gear and spending time reading up on fixing.
Step one. Check the fuses. Even if they are not blown wiggle any relevant fuses in their place because they corode and make poor contact sometimes. Next. Start the car and pop the hood. Have a helper sit in the driver seat and switch back and forth between the a/c button and the economy button on the climate control. If its hot out and engine is warm you should hear an audible difference in sound up front within a few moments of pushing the ac button on the dash. The noise will be the compressor turning on. Compressor is on one of the belts up front. Probably on the driver side down low. You can probably visually see if the front part in front of the pully is spinning and not spinning when you switch back and forth from vent and ac switches on the dash. If it appears that it is not turning on and all fuses are fine the next step is to crawl under (engine off) and look closely at the wires coming into the bottom. The plug there takes a lot of abuse and can come out or wires rip. I found mine to have a bad connection there on more than one occasion.
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84 300SD 274K 38K miles on flatplate heat exchanger and various diesel/veg blends. prior to that 4K miles on unheated veggie blends with kero and DinoD. |
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