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2001 SLK 320 six speed manual 2014 Porsche Cayenne six speed manual Annoy a Liberal, Read the Constitution |
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Thanks for the thread...
He mentions: 100F ambient "So to compare the 2 lets discuss the differences. The 240D has no tinting. I run R12 in a standard system with pressures of 22 low and 265 high. The 82 300TD has R134a. A NEW evaporator as well as everything else. tinting, legal tinting, and a parallel flow condensor. R134a and the aux fan is on all the time. I'll try the system with it in the normal mode." Well I am getting like 60psi low and 340psi high...and I am not overfilled. I am in fact, almost underfilled. FSM states I need 80% of R12 amount, I have 60% in the system. It was less than 2x12oz cans, so about 20oz. I was concerned over the high pressures, so I completely flushed the system thinking maybe it was overfilled with oil or sludge and replaced the TXV and drier, it dropped pressures a little, but not much (it was 65psi low and 360psi high before) INCLUDING aux fan on high the entire time. The system just stopped taking anymore out of the 2nd can. I put it in ice water ran at 2000rpm -- wouldn't take it in and no wonder with those pressures...
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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 |
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Unfortunately enough time has passed that I have no recollection how much R-134 was used in my conversion. I am thinking it was about two cans, so roughly a 60% charge.
If you're seeing 340/60 with the engine running at 2,000RPM, then I think you are overcharged. I suggest recovering some refrigerant until the low side settles in at 35ish PSI with the engine at 2,000RPM. Don't fixate on the 80% rule for converted systems, focus on the pressures. You want to hit the target low side pressure without exceeding a reasonable high side pressure - that's how I charge conversions. Remember, the boiling point of the refrigerant is controlled by the low side pressure. The lower the pressure, the lower the temperature at which it boils. If you have 60PSI low side, about 60 degrees is as cold as the evaportor will ever get. (Need to look up the temp for 60PSI for R-134a; I don't have a pressure/temperature chart handy.) In an overcharged system the rise in low side pressure means the evaporator will never drop below the corresponding temperature, regardless of whether enough BTUs can be removed or not, hence resulting in inadequate cooling complaints. |
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It looks like you're pressures are too high. I'd agree with jcychun, looks like a bit overfilled. Back it down to the recommended levels in the chart and check performance.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
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I've had SEVERAL conversions end up in the 60 to 65% range. I haven't done one in a while, but if I did, or I was recharging one already converted, I would start with 60%.
My best conversion has been my 88 Vette. It has 65% and makes 38 at the vent even on a really hot day. I was amazed at this because a bunch of people told me that they were terrible candidates for conversion. I agree that your pressures are high. If using less than 60% improves system performance this will be close to amazing, but also very interesting. Thanks for keeping us posted on all this.
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2001 SLK 320 six speed manual 2014 Porsche Cayenne six speed manual Annoy a Liberal, Read the Constitution |
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As I said, I am not overcharged. I have less than 2 cans in it. 20oz at most.
I've evac'd and recharged 3x total. Im not overcharged....
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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 |
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60 PSI on the low side at 1000 RPM is still way higher than I would expect. If you tap on the TX valve does it change?
FWIW at that RPM my car is at about 25 PSI. At idle it is at about 40 PSI on the low side. -J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
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That is a fantastic idea to bypass the heater core but I need to know more about the resistor, is that because you want the fan running more often?
tx carmen |
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Doing some thinking....
What about creating a misting system for the condenser? I bet that would resolve all issues extremely cheap since I know my A/C can pull 40F from the vents on 90F days. Radiator Mist Cooling System I still have the lines for the OE wiper unit, but I have aftermarket DEPO Euro headlights now....so I have lines pretty much running both sides if I could make it work with the washer reservoir.
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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 |
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http://www.peachparts.com/swhopforum/tech-help/319665-i-need-forums-input-manual-engine-cooling.html
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1990 190E 3.0L |
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For what it's worth, I suffered from inadequate a/c in my 88 300CE for a long time, replacing various parts. When I finally got rid of the original compressor and replaced it with the 90-95 version part # 0002300511, it finally dramatically improved. Since then, I have no complaints about it and my kids in the back sometimes complain they're too cold.
The 0002300511 compressor is made for R134a, so it must be better at cooling at the higher pressures.
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I never go far without a little Big Star 1994 E500 199/Gray 82k 84 300D (Salty) Orient Red/Palomino 141k 88 300CE (Ersatzhammer) 904/Java 163k -- Turbo Technics twin turbo kit, AMG Gen I body kit, Sportline steering box and steering wheel, Sportline/Eibach /Bilstein Sport/500E suspension, Quaife LSD in 210 mm diff case, Silver Arrow brakes. 88 300CE Brabus 3.6 199 on Black 44k |
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I was reviewing the wiring diagrams for the the W126 with dual fans, and according to the FSM the high speed isn't fused
My car has an un used strip fuse location, I might install one for the high speed. Sent from my iPhone using Tapatalk
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
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My 190e 2.6 has twin fans ahead of the condensor...
Could be made to work...
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2009 Mercedes ML320 Bluetec |
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My 190E has dual fans that draw about 30 amps total. I have them modified so that I can turn them full power manually. I've also removed the resistor.. I probably should put a fuse on the power line though. It comes off the battery and runs to two relays (one for each fan)... I think I actually used the car's old alternator cable as the wire.. (since upgraded to 0 gauge for the 143amp)
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
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