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#1
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Air conditioner: High and low side pressure
1993 300D: what should the low side pressure and high side pressure be with compressor running? mine is at 40 low side (blue hose) and 225 psi (red hose) on high side? is this normal?
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2000 Ford 7.3 Powerstroke 4x4 2006 Mazda Tribute 1983 Black 300 D (donated to charity) 1993 Teal 300 D (160K) Sold "I love the smell of burnt diesel fuel in the morning, it smells like ....VICTORY" Semper Fidelis USMC 1973-1976 |
#2
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What was the ambient temperature? that will be the most important defining factor.
If you do a google search for Refrigerant Temperature Pressure charts I'm sure you'll find something. Also: Was the engine at idle or 1500 rpm as recommended? Did you have the auxilliary fan running? Danny
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1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
#3
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Quote:
yes the aux fan was running, engine at idle thanks
__________________
2000 Ford 7.3 Powerstroke 4x4 2006 Mazda Tribute 1983 Black 300 D (donated to charity) 1993 Teal 300 D (160K) Sold "I love the smell of burnt diesel fuel in the morning, it smells like ....VICTORY" Semper Fidelis USMC 1973-1976 |
#4
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There's a chart here:
http://www.ackits.com/index.cfm?fuseaction=Chart The pressure should come close to matching the outside air temperature. What temperature were you getting out of the vents? Danny
__________________
1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
#5
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also,
It needs to run at that high idle at least 10 minutes to get things stabilized and moved around in the system... for accurate readings...
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#6
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Quote:
This may sound silly but I'm still reading on A/C recharging, I'd assume Low side will increase accordingly to High side? So if my High side is correct my Low side should also (all else being equal)? Also, what's the best way to monitor ambient temps outside?
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#7
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Quote:
Of course other things can come into play that can cause innefficiency. Quote:
R-134a PressureTemperature Relationship Pressures shown in the charts are provided as a general guide and may not represent your exact readings. Ambient temperature is measured 2 inches in front of the condenser. Go to the nearest hardware store and buy a $2.00 dial thermometer. Danny
__________________
1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
#8
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Quote:
You should be measuring ambient within a few inches of the condensor. Parameters necessary for system evaluation. First run at 1500 RPM with a/c max and fan high. Low side High side Ambient temp Vent temp With this information and access to the p/t chart FOR YOUR MODEL CAR, the system performance can usually be analyzed. Have a great day, |
#9
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Well yes a thermo, but I meant do you just hold it infront of the condensor to get the temps or what...
__________________
I'm not a doctor, but I'll have a look. '85 300SD 245k '87 300SDL 251k '90 300SEL 326k Six others from BMW, GM, and Ford. Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG] |
#10
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Bend a wire hanger to hold it for you. A little duct tape may be in order.
You don't want to be standing there holding it. There are better things to be doing. Danny
__________________
1984 300SD Turbo Diesel 150,000 miles OBK member #23 (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination |
#11
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Isn't the outside air temperature sensor somewhere between the bumper and the AC condenser?
I had 91 degrees indicated and 40 psi low side when I topped off my 300TE this afternoon. I imagine that ambient temps climbed a bit due to idling for a while tho....
__________________
Bob Roe Lehigh Valley PA USA 1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently 2007 Honda Odyssey Touring, 2014 E350 4matic |
#12
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No, use a dial thermometer and just put the probe shaft down into the vent. You can get a dial thermometer for about $5 at the auto supply.
Good luck, |
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