airconditioning

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mercjerk
Dernburg Wagon
Posts: 8
Joined: Sat 13 Aug, 2016 4:42 pm
Model you own: w108
Location: melb

airconditioning

Post by mercjerk » Thu 25 Jan, 2018 4:27 pm

Hi .mercjerk here ...existing 1969 w108 owner have jumped ship from w108 to 210 forum .. recently acquired w210 1998 e240 wagon (nice ride) fixed a few issues .. no reverse lights ... crank sensor replaced , new battery.. stupid wiper/ radio /sunroof intermittent elec problem ( that was a win!)past a roadworthy with flying colors and now registered ... thanks mercedes for building a quality car :dance: ...... fantastic.... except the bloody aircon
no cold air :dontknow: ... but nothing on this forum about ac in last ten years ... mercs must have the best ac in the world ?.or at least australia
( lots on overseas forums but .... anyway) . compressor clutch does not in gauge .i have 140 psi in the system trying to overcome low pressure switch lock out but still no go . cabin fan works . apparently no relay in system . have checked fuse ....... have 9 volts on compressor wire...... even feed it with 12v direct trying to check compressor clutch .. but no go ... it seems that the Sam modules are the brain that sends the commands to everything so, is it that ? its sending 9 volts ... or is it the low pressure or high pressure switch faulty? or the sensor in the condenser? so Before i start ripping away at the dashboard testing for power at switches( no digital stuff - rotating dials) and trying to get to sensors behind dash .. does anyone have any idea? any merc ac experts? so ive booked in with merc repairer in moorabin melbourne next week to check codes .........i think im up for a compressor but i dont want to buy it , fit it and find out it was something else.........a new compressor and re gas is almost more than i paid for the car
Amazing car . 20 years to still be in this condition is a pat on tha back for mercedes quality so if it costs me a grand ..its worth every cent
razr phone 1321.jpg
ps ..when a plumber can fix something on a mercedes that and autoelectritian cant or a mechanic . there is seriously something wrong in the world
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Bartman4800
300 SLR
Posts: 1827
Joined: Fri 10 Oct, 2008 12:10 am
Model you own: w111
Location: Perth WA

Re: airconditioning

Post by Bartman4800 » Thu 25 Jan, 2018 6:25 pm

If you fed the magnetic clutch with 12V, and it still does not engage, I suspect your clutch coil has fried.

Has happened twice on my Passat's AC compressor.
The compressor seized up, the clutch pack got really hot (because of the slippage) and within 10 seconds the coil burnt....
It had around 200k on the clock when that happened.

Have you tried rotating the compressor by hand? (Not the outside pulley, but the clutch itself)
If you cannot, the compressor is seized and has to be replaced.


Bart
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

newMercowner69
S Class
Posts: 93
Joined: Tue 24 Feb, 2015 5:00 pm
Model you own: w202
Location: Melbourne, Australia

Re: airconditioning

Post by newMercowner69 » Thu 25 Jan, 2018 7:14 pm

It could be compressor clutch bearing,
That's seized,
If you can't turn compressor clutch by hand,
That's possibly the cause,/what's happened.

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Ivanerrol
Mercedes Demigod
Posts: 5769
Joined: Sat 12 May, 2007 3:21 pm
Model you own: w204
Location: Melbourne

Re: airconditioning

Post by Ivanerrol » Thu 25 Jan, 2018 9:48 pm

Here's an AC clutch I prepared earlier.
IMG_4095.jpg
The front piece is the clutch. The red circular object is the coil and the rear bit is the pulley.

The pulley rotates with the serpentine belt. When voltage is applied to the coil it pulls in the clutch so that it comes into contact with the rotating pulley.

You should be able to reach down and turn the pulley by hand - it should turn easily. If it doesn't turn your compressor is seized.

With the engine off, you can apply 12 volts to the clutch coil active lead and you should here a definitive "clunk" as the clutch comes in to the pulley.

To get at the AC compressor you will need to remove the under engine cover.
there are three bolts holding the compressor on.
here's the coil.
IMG_4096.jpg
The loose wire with the round terminal is the ground the long tube is where the live connection is plugged in.

if you remove the live connector from the tube you can see if there is actual voltage coming through on the connector.

The clutch, coil and pulley cab be removed with the compressor is in situ. There are youtub viseos out there showing how it's done. You need a impact tool to get the nut off the compressor.

I changed the compressor on my W210 only a few months ago. There's a write up on this here somewhere.
My compressor had died.
I tried to buy a second hand one. two out of three were faulty. I ended up finding one in my garage I forgot I had.
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W211 - E240
W204 - C280
W210 - E240
Departed
W202 - C200, C180, C180
W126 - 380SE , 380SE (Ex SA Import), 560SEL
W124 - 300e, 260e (ex Japan)
W111 220s (Indonesia) 4 speed manual column shift
W123 230
W116 450SEL
W140 420SEL
W210 E240
W209 CLK 240
W201 190e 2.6 (ex U.K.)

mercjerk
Dernburg Wagon
Posts: 8
Joined: Sat 13 Aug, 2016 4:42 pm
Model you own: w108
Location: melb

Re: airconditioning

Post by mercjerk » Fri 26 Jan, 2018 10:06 am

thanks .. great photos... will investigate today...... thanks

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Ivanerrol
Mercedes Demigod
Posts: 5769
Joined: Sat 12 May, 2007 3:21 pm
Model you own: w204
Location: Melbourne

Re: airconditioning

Post by Ivanerrol » Fri 26 Jan, 2018 10:20 am

Small correction.
You reach down and turn the clutch at the front of the compressor. Not the pulley itself. (Brain fade while writing)
The clutch is connected through to the compressor innards - if the clutch doesn't turn freely then there's something wrong with the compressor. Freely is freely with no real resistance.

If you can turn the clutch freely and if the clutch operates with 12 volts applied then it could be the switch on the drier.
W211 - E240
W204 - C280
W210 - E240
Departed
W202 - C200, C180, C180
W126 - 380SE , 380SE (Ex SA Import), 560SEL
W124 - 300e, 260e (ex Japan)
W111 220s (Indonesia) 4 speed manual column shift
W123 230
W116 450SEL
W140 420SEL
W210 E240
W209 CLK 240
W201 190e 2.6 (ex U.K.)

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