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#16
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Jump it without the engine running and see if it latches in. I have never done it that way but I guess it is possible.
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Jim |
#17
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IF you jump it and hear a click you can pretty much figure the actual clutch is working..
that does not mean that the clutch is also able to turn the compressor... thus why Jim has never tried it without the engine running... sorta doing half a test and will still need to do the rest... make wires and clips so you can stand outside the car to jump it....
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#18
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You can jump it by removing the Kilma relay ( behind the battery in the 190D ). Look for pin 5 and 7 in the socket. They are marked on the socket. Jump 5 and 7. There are a lot of posts on this.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#19
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Ok, finally did jump pin 5 and 7 and compressor did nothing. What next? |
#20
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I do not have an AC manual for your car...
but my next move would be to run direct jumpers to the ac clutch wire and the body of the compressor from the battery.. that isolates the clutch in terms of a test... then go from there.. right now you have other variables in the system which could be giving you a false negative. My car does not have a Klima.. for which I am grateful.....
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#21
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Sorry, my mistake. The compressor is turning on when I jump it, that is good news. But I dont know where to go from here.
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#22
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Ok.. remind me if I forgot something you have posted already... .
but you have AC gauges to attach to both sides ? Observe color coding.. Goggle to wear when working on AC stuff ? purge the AC lines and hook them up... for a very very short time jump the compressor and see if you get any movement of the gauges... write down what both started at.... and what they go to at 30 seconds of running.... Be sure your fins are clean on radiator and condensor... very important...and you really need a fan blowing into the intake ... as squirrel cage type is best... open the windows... do this outside due to carbon monoxide inside a garage... and turn system on HIGH BLOWER...and the car at HIGH idle.. then report back as to everything you observe.... The Test of an AC system MB says it a ' functionality test ' ... So we are just trying to isolate down to the problem/s and then address them one at a time...
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#23
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So do you mean the clutch is activating.. or the engine is running AND when activated the clutch is causing the center of that unit to turn ?
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#24
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I would forget all pressure gauge for now. All measurements are futile unless you can get the compressor to run when you call for A/C. If you jump pin 5 and 7 and compressor runs then it is 'good' news, at least the compressor is OK and the electric connection to the same is intact. My experience with the 190D is that if you remove the Kilma relay then the tach will not run. Why MBZ designed-in the kilma relay with the tach circuit I would never know.
You can do a test by first jumping the low and high pressure switches on the receiver driver then turn on the A/C button in the car. Depress the de-frost button on the left-most side will turn on A/C and blower at full speed. You can try it for a few seconds and see whether the compressor turns on or not. Do not leave it on for too long as it may ruin the compressor if there is no/not enough freon. If the compressor does not turn on then it could be the kilma or the CCU. If it turns on then your A/C is OK and you can check for leak and charge the system. I only know enough to fix A/C and now you know as much as I do. The issue is to determine whether it is the Kilma or CCU. I have no idea how to do it easily. I know for a fact that a gas car Kilma would work on the 190D. I do not have the part # with me as I am on travel in Europe. I can post the part # of the 4-cyl gas kilma once I return. Good luck.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#25
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With the car running I jump pin 5 and 7 and the compressor turns on. (center of the unit is turning) but compressor will only run when I jump pin 5 and 7.
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#26
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#27
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I do not have the manuals or experience with Klima systems... so I would follow what ah-kay suggests....
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html |
#28
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There are 2 switches ( one is on top, one is on the side, green color?? ) on the receiver driver. One is low pressure to detect enough freon ( freon pressure ) and sends the signal to the CCU. One is high pressure ( on top of Rec/Drier ) to detect A/C running to turn on Aux fan. Jump the low pressure on to let the CCU thinks freon is OK. If you do not know which is which then just both. You jump them by just shorting the 2 wires connected to the switches.
If now the compressor turns on then you are in business, probably just no or lack of freon. Just connect the gauges and charge away. If it does not turn on then you can do testing by elimination. Put a known good Kilma or CCU in and redo the test. 190D Kilma is expensive so you can try a gas kilma from a junk yard. Not every 4-cyl Kilma but I do not know the part # of the one I used as I am away. I am flying back tomorrow and I can post it here. It is bed-time for me in Copenhagen so I will post it as soon as I return or some other member may know.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#29
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#30
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When you report back on tests like this you need to be very specific... this one might be obvious to ah-kay.. but some might not be... which one caused the aux fan to come on, which did nothing ?
__________________
1980 240d , chain elongation, cam marks reference: http://www.peachparts.com/shopforum/showthread.php?threadid=10414 http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html evap fin cleaning: http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator A/C thread http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html Last edited by leathermang; 05-08-2011 at 08:37 PM. Reason: spelling |
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