PAG Oil Quantity / Type and Flush Review...Please Read! - PeachParts Mercedes-Benz Forum

slimak9 · #1 07-18-2007, 02:52 AM

Thanks Dave for all your input.

I absolutly want the job done right. I just completed removing the compressor (wow! any less room and the radiator or sway bar would have to come out, thankfully removing the plastic shield behind the radiator DID IT!)

Also,
1. The hose from the Dryer to Condenser is out.
2. The hose from the Compressor to Condenser is out. (wow! was it ever tight/seezed to the fitting on the Condenser, what a work-out!)
3. The Dryer is out, new one arrived.
4. The Expansion Valve is out, new one arrived.
5. Abviously the Low Pressure/Fill hose is out (the one that originaly cracked and started this mess!)
6. The rest of the hoses are just disconnectedm but not out (way too much work, will flush them the way they are installed.)

I spun the Compressor w/ Gravity and I gota say not much oil came out, approx. 0.5oz. (most of it must have leaked out while the hose at the Compressor was faulty).

Now I just have to pick up 2 more O-Rings for the one side of the Expansion Valve (Forgot), 1 O-Ring for the Switch on the Dryer, and get a refill of DRY AIR.

Then flush the Evaporator, Condenser, Compressor, plus all the lines.

I'm waiting to see the outcome, and hopefully this will end my A/C Wooes for a bit.

WOW, is Compressor Oil ever so expensive, I picked up a bottle of exactly 250ml OR 8.45oz. (funny to be exactly the amount I need for the system as per ALLDATA) for a list $72.55 (CND + 14% Sales Tax) = $82.71, (Part # 001-989-08-03) Can anyone in the US tell me what dealers there sell it for?

dpetryk · #2 07-18-2007, 09:28 AM

I buy a brand "Master Chem". The stuff is made in Germany. I pay about $20 for an 8oz. bottle. You must be buying from a MB dealer.

BENZ TEK · #3 07-19-2007, 10:42 PM

Quote:

Originally Posted by slimak9

a bit.

WOW, is Compressor Oil ever so expensive, I picked up a bottle of exactly 250ml OR 8.45oz. (funny to be exactly the amount I need for the system as per ALLDATA) for a list $72.55 (CND + 14% Sales Tax) = $82.71, (Part # 001-989-08-03) Can anyone in the US tell me what dealers there sell it for?

I use PAG 46 and it cost me for 8 oz about $12.00 US

slimak9 · #4 07-20-2007, 02:26 AM

Well everything is sealed, and my Vacuum Pump is running. I'll leave it on for 12 hours or so. Then see if it holds the vacuum for 1-2 hours.

I couldn't justify using such expensive PAG oil, so I used Castrol PAG 46. For about $10 US per 8oz. I was corrected by a MB tech, stating the system is desgined for 160ml OR 5.4oz of oil. Good thing, or else my cooling performance would have been reduced if I put in the 8.4oz as originally thought.

slimak9 · #5 07-20-2007, 02:32 PM

Well vacuum held at about 28". Don't have a Micron Guage.

I knew this would happen: How do I bypass the Pressure Switch on the Dryer, to activate the compressor so I can charge the system? Its a 3 pin switch variable resistor (which you can't jumper).

Anyone know how to active the compressor manually?

dpetryk · #6 07-20-2007, 02:50 PM

Disconnect the plug at the compressor and run a jumper wire to the battery and connect it to the clutch coil connection at the compressor. I use a clip lead long enough to get to the battery positive terminal. Be sure the connection is to the clutch coil. My compressors only have a single connection so you cant make a mistake. If yours has more than one, don't follow my advise. You might damage something. I know some compressors use a shaft speed sensor. Not sure about yours.

I have always just let the system recharge from the source of refrigerant without the compressor until it will not take any more gas. Then the compressor would always come on normally since there was about 90 PSI in the system. Never had to jump around any switches. But then again all my systems are R12 and older than yours.