so it has been about 4 days that i have had my a/c upgrades on my car and was curious what kind of vent temps and pressures i should expect? here is what i have done:

-Sanden SD7H15 enhanced compressor
-16x20 parallel flow condenser
-all new or rebuilt barrier hoses
-w126 bosch aux fan that kicks on at about 175psi
- flushed evaporator
-new "134a" TXV
-ETR adjusted to about 38 degree vent temp cutoff
-evaporator cleaned very well
-about 7oz of double end capped pag oil
-new receiver/ drier and pressure switches
-vac pulled for an hour with no leaks

so as you can see, i think i have taken care of pretty much everything but my vent temps are only in the 50-60 degree range with blower on medium to high settings in 80-85 degree humid weather. still colder than r4 setup of course. after being on the highway doing 75, the vent temps would be in the 40's when it was 75 outside but i was expecting that when it gets in to the 90's outside. if i turn the blower on low, vent temps get low enough to cycle compressor. my pressures at idle when 86 outside, aux fan running, and blower on high are: 30 low and 190 high. pressures after 30 seconds of keeping engine at 3000 rpm are: 20 low and 245 high. head pressure climbs when revved. vent temps don't change that much from idle to driving and the suction line is always very cold and sweating under the hood. is there something wrong with my current charge? would messing with my txv adjustment screw help? i was really expecting colder vent temps with all this. any suggestions appreciated!

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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect

Did you pull evaporator to clean it?

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Jim

No, I was actually able to clean it very well from the blower hole with coil cleaner, garden hose, and a shop vac. Stuck my phone up there and took pictures to see where I missed...

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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect

Your pressures indicate inadequate condenser area...

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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 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

This could be from air in the condenser. "Vacuum" is a BAD way to test for leaks...
Always leak check with PRESSURE!

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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 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

How does air get into the system? I can't imagine I have any leaks as everything is new and holding pressure. Don't you have to pull a vacuum to get all the moisture out?

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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect

Yes, but if there are leaks, the vacuum brings in air.

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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 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Best practice is to recover all refrigerant, then perform a t/p test on tank and see if it's pure 134.
Then pressurize with N2 or similar dry gas and time test for two hours to prove leak free.

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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 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Is there any other way to check? I don't have any of that equipment.

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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect

How did you adjust the ETR? Also what year of w126 is your aux fan out of? I need to do the same to our '83 300D

How much 134a did you put in your system?

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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles

There is a very small flat head screw with some type of thread lock from the factory. I'd set your blower to a low speed and stick a thermometer in a vent. Turn screw in slowly to decrease cut out temp. If you go nuts on it and screw it in too far, you will need to get another one because it pushes on springs inside and is a mess if you try to dissemble it. Trust me, I tried I would not try to get vent temps below 36°. The evap core will be a few degrees colder than the air...

edit: i forgot to answer 2nd question. it was from an 89 560sel. there are 2 types of the "large" aux fans. one is found on early w126's and w124's and has a motor that sticks out further. no problem if you are upgrading to a larger fan on a w126 but you need the later bosch fan with the skinny motor to clear the grille on a w123 without cutting anything. i'm not sure what year the changed to the bosch but you can go check out some w126's ans w124's at the pick n pull ans see what you can find with good bearings

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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect

Check out my post and video for the 2nd condenser I just installed. Fixed all my issues with excessive head pressures.

http://www.peachparts.com/shopforum/diesel-discussion/355005-dual-condensers-w123-results.html

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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect

please can someone tell me how to buy this mounting kit

Do a search on here for ROLLGUY and pm him.

One of the more interesting things to do (I'm weird this way) is to watch how dynamic the a/c system is on my 98 E300 on the push button readout. Evap outlet temp, pressure, and hp side freon temp. Watching this shows you how it is all about the performance of the condenser.

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Jim