You're the man!

I will report back as soon as I get the hose. Getting Genuine MB from the stealership to get this wrapped up.

I wonder if this hose was the reason for the high system pressures for the past few years that I never solved other than passing it off as limitations of 134a....We will find out. Fingers crossed.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Awww shucks, I just try to look out for my fellow 124 wagon owners.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

Anything on the high side of the expansion valve should be hot. If the condenser is hot but the hose from condenser to drier is cold, then the hose is the culprit. This is consistent with the rapid cycling, as the pressure switch on the drier is effectively on the low side of the system due to the blockage in the condenser-drier hose.

The stealership at my house wants above list price for the hose ($120!!!)...outrageous...
Ordered it online for $63 (Genuine MB) and should be here tomorrow so will put it in and will report back.

I will also work on replacing the rest of the rubber in the system too. I just need some cold air right now

__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

I know the feeling well. I got tired enough of dealing with my '87 wagon that I replaced the entire a/c system all at once. New evap, new vacuum pods, new compressor, new manifold hose assembly, new txv, new condenser. It was so nice to switch on the a/c and just get cold air.

With new everything there wasn't much performance difference between R134 and R12. I collected some data points on each and wrote up a thread. This was back in 2002 or 2003, but the thread is out there somewhere...

Couldn't even blow through the hose with it in my hand it was so blocked. I cut the hose open and hose was fine, but the metal inside was bent...no idea how that would happen, but it was. Maybe it took a rock or something...

A/C is now functional....pressures are still high as before though. 18oz R134a in the system and its 55psi low 380psi high at idle garage 110F ambient (I know its extreme temperatures for a converted system to handle). As I said, ONLY 18oz of r134a in the system so its technically according to MB about ~8-10oz short of the recommended amount.

I already have a new evaporator, 10pa15c compressor, new blower motor and cages and drier in the garage ready, so this winter, I will get a new A/C manifold hose, pull the heater box and basically start from scratch with R12.

__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Those pressures are high on both sides. Does the aux fan cut in around 250 PSI? How much oil in the system? How deep of a vacuum before charging?

__________________

90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff

28" vacuum. Aux fan is going on full at 300psi. No idea about oil quantity in system.

When I look at this chart, at 110F ambient, the low side is right, but the high side is much higher...

__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

All my 124 cars ran higher on the high side than generic temperature/pressure tables predict. I think it has to do with the location of the high side attachment point for the gauges. I wouldn't sweat it. Do you have the MB 124 shop manual? Of course it would not have a spec for 134 in your car, we would still be guessing...

What about the idle RPM, does it matter when taken pressure measurements?

Should the engine be rev up to say 1K, 1.5K or even 2k or idle rpm of 750 is ok?

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86' 190E 2.3L