Got everything hooked up today ...

Ran vacuum for 6 whole hours today ...

And no leaks and gauge stayed at 29 the whole time ....

Tried to install one can of oil (4 oz) ... not sure any really got in ... no sucking

Tried one can of R-12 and not sure any really got in ... no sucking

I have done other A/C systems before and the can of refrigerant drained pretty fast on other cars.

So, what could it be ? I am totally stumped and bumed. I thought I would be having AC this week.

Any ideas ?

Check to see that your hook up is depressing the pintle in the schrader valve....

__________________
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

SUCCESS ! IT WAS THE SHRADER VALVE AND NOT BEING CORRECTLY DEPRESSED.

I got two cans of R-12 which were 12 oz each. I also got in one can of oil, 4 oz. The oil can stated it was for R-12. All of this stuff was NOS.

I drove a little outside. I got 41 F* and I am thinking my system is low on FREON. I am thinking my cabin blower is on its last leg right now. Making a bunch of noises ... So, as long as it makes it til this upcoming weekend, I am fine with that.

THANK YOU ROLL GUY !

I am thinking one more can of R12 at the 12 oz flavor will do it.

I am going to buy one of those clip on thermostats. I used the laser gun pointer deal currently.

No more soaked shirts by the time I get home from work !

John and I pulled that blower and lubed it about a year ago. It was running pretty rough, the lube helped as a band aid. Sounds like it might be dried up again. It was so bad it melted fuse 8 (talk about a panic, smelling that melting plastic ) so that is why the blower is wired to fuse 5 now. I would stay off of high speed until you get it fixed.

You might want to start scouring the P-N-P for another one...or there is always the Volvo blower motor trick (Volvo used the same supplier for their motor as MB and there is a much cheaper motor intended for the Volvo that crosses over).

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Thanks Jay.

Quick question to the forum.

Since A/C is new to me in this car ...

The dial has at one end "MAX" and "O" at the other. If I do not put the dial at MAX, then the crunchy, clanging, rattling sound does not sound so bad. BUT, once I put it on MAX, the noise goes crazy ... truly a squirl cage ... LOL.

What is that ?

Also, I am guessing right now that I have about 22 oz's of R-12 in my system and about 4 oz's of oil. Maybe a little more. When I drained my Sanden, I am thinking about 4 oz's came out. I kept the oil so I could measure it.

Will I hurt anything temporarily ??????????

I would have put 4 oz in the compressor before charging, and another 4 oz in the system. It may be best to recover the 22 oz, and add the 4 oz in the compressor. Also, remember that the Sanden is smaller, and would require less refrigerant. The 2.2 pounds (factory spec) could be reduced to 24 oz and probably be just right. Are the bubbles gone in the sight glass on the drier with 22 oz?

__________________

All Diesel Fleet
1985 R107 300SLD TURBODIESEL
2005 E320 CDI (daily)

LOTS of parts for sale!


EGR block kit
http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html

1985 CA emissions 617 owners- You Need This!
Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst.

Sanden Instalation Guide (post 11):
http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html

The 240D has a manual climate control.

There are 7 devices in total that operate the system.

From the top:
The lever on the dash is used in the winter, it allows fresh outside air through the center vents while maintaining heat at the floor. In summer mode the lever should be placed whichever way allows flow out the center.

The wheel on the upper control panel is the thermostatic control for the compressor. It has a sensor on the evaporator and cycles the compressor on and off, keeping the evaporator above freezing. The wheel setting allows the duty cycle of the compressor to be altered, which provides a way to set the temperature of the delivered air. Sending this wheel all the way to MAX closes a contact point on the wheel, which actuates a vacuum valve. This valve operates the pod that closes the recirculation flap behind the dash and gives you "max a/c".

The two levers on the control panel send the air either to the defrost, the floor, or the console vents. Purely mechanical action on the air flaps.

The two outer dials are cable actuated valves to the heater core. 240D has dual zone heat, very fancy! These dials do not do anything with air flow only water flow.

The center dial is a combination electrical and mechanical knob. The mechanical part (turning the knob from 6:00 to 9:00) opens an outside air flap. With the dial at 6:00 all outside air is shut off. At 9:00, 10:30, and 12:00, there are three sets of contacts which jump out sections of the blower resistor. At 9:00 the entire resistor is in series with the blower. At 10:30 half of the resistor and at 12:00 the entire resistor is jumped out.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Thanks to VSTECH and JayBob's Info !

VSTECH did his A/C magic. He evacuated the system, did another purge, and re-charged it.

I am thinking the expansion valve might be bad since the high and low pressure numbers are off per VSTECH. VSTECH also installed a big W126 condensor fan and it's running as soon as I turn the key. Need to figure out the relay stuff now, but it's OK in the short term.

While driving home yesterday at 3-4PM, it was about 92F and super humid and muggy and the temp gauge was a rock solid 40F, and that's stopping in traffic for about 20 minutes on I-77 because of a bad wreck on the way home.

This AM, it's about 78, and super humid and muggy and the gauge dipped below 40F a few times, but it seems content on being locked in at 40F. I am very happy with that.

As for an expansion valve, do they sell a R-12 EV? OR, are they all the same?

Thanks again ... nice and chilly inside.

Attached Thumbnails

 

They are not the same, but I have used R134a expansion valves in R12 and it works fine. My understanding is it works the same at the low pressures, but on the high side there is a slight difference but doesn't affect performance much.



.

__________________
1983 123.133 California
- GreaseCar Veg System

Just fired the ol' girl up. I do see bubbles - foam in the sight glass. I just let it run for a few seconds. Is that bad?

Assuming the R-12 is close or OK, will I hurt anything until I add another 4 oz of oil ? I am hoping VSTECH has the recovery equipment and I will drive to his house this week for a re-do of the oil and R-12.

Bubbles mean that the refrigerant is low.

__________________

All Diesel Fleet
1985 R107 300SLD TURBODIESEL
2005 E320 CDI (daily)

LOTS of parts for sale!


EGR block kit
http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html

1985 CA emissions 617 owners- You Need This!
Sanden style A/C Compressor Mounting Kit for your 616/ 617 For Sale + Install Inst.

Sanden Instalation Guide (post 11):
http://www.peachparts.com/shopforum/diesel-discussion/367883-sanden-retrofit-installation-guide.html

Assuming nothing goes wrong between now and tomorrow around the same time, I am having VSTECH do a total re-do on the oil and R-12 charge. Just to make sure ! Well worth the time and expense. I love AC ! Also, picking up a set of injectors for someone who has been patient.

yeah, the car looks good, pressures were 60 and 160, VERY ODD to me, I only got about 2 lbs into the system, he had removed the belt driven fan, and ONLY had the stock 123 aux fan for cooling, and it only came on after the system got up to temp... lower 1/3 of the condenser was not getting any air, so I pulled that fan, and installed the 16" fan from my 85 SD... fortunately, he has a PF condenser, and it's only held in with zip ties, so moving it to make room for the bigger fan was no challenge.
the sight glass was clear, to SLIGHT bubbles drifting through. good return superheat of course, the TXV is working, but I think it's stuck open, as the pressures were too high on the suction... I'm happy with it's performance now, so I'm leaving it as is.
glad it's cooling well... I'm SURE it's cooling better than it was with that little aux fan only running on temp!!!

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Don't make fun of my little aux fan ... LOL.

Driving around like royalty now ... nice and cool.

Thanks again VSTECH !!!!!!!!!!!!!!!!!!!!!

Greazzer, get a cheap eb*y fan on there already you're gonna cook that engine. $60 will get you a fan, relays, and wire

__________________
$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment