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#1
02-26-2018, 04:07 PM
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Cold A/C on low fan, warm on high...Is 134a the culprit?
I have a 1991 350SD. When It came time to replace the A/C compressor, dryer, etc, I decided to move to R134a and since then, my A/C is very cold when the fan is on low speed but warm when I switch to the high fan setting. Did I make a mistake by switching to R134a?
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#2
02-26-2018, 04:09 PM
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Doubtful. I run 134a in my 300SDL and it'll blow low 40s with the fan on high. Check your recirculation flap(s), if they are stuck in "fresh air" mode, you can have poor cooling performance.
__________________
Current stable: 1995 E320 157K (Nancy) 1983 500SL 125K (SLoL) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) Gone and wanting to forget: 1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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#3
02-26-2018, 05:40 PM
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Diseasel300,
From your experience, are flap problems generally electrical or vacuum related? I would assume vacuum and I need to troubleshoot that aspect, right? Thanks for your help.
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#4
02-26-2018, 06:15 PM
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I'm not familiar with the W140, but on the earlier cars they are vacuum operated. The pods get old and leak. Additionally, did you charge by weight or by pressure? Did you pull a deep vacuum before charging with refrigerant?
__________________
Current stable: 1995 E320 157K (Nancy) 1983 500SL 125K (SLoL) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) Gone and wanting to forget: 1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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#5
02-26-2018, 09:24 PM
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Quote:
__________________
 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
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#6
02-26-2018, 09:59 PM
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Quote:
 Not sure why I thought '91 was W140
__________________
Current stable: 1995 E320 157K (Nancy) 1983 500SL 125K (SLoL) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) Gone and wanting to forget: 1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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#7
02-27-2018, 08:31 AM
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If it is not a flap issue, it could easily be a refrigerant problem.
A compressor problem A TXV problem Or even an electrical problem. Test what your a.c. is doing. Ya need a HUGE shop fan in front of the vehicle. Gauges. Thermometers to measure line temps.
__________________
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!
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#8
02-27-2018, 09:06 AM
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Quote:
__________________
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl.
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#9
02-27-2018, 09:30 AM
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Quote:
TXV would be very close... the hoses in a 91 are likely barrier... but not for sure... leakage could be an issue. The condenser and its fan are the same with the 93 as the 91...
__________________
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!
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