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Old 06-16-2001, 07:10 PM
The Bob
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I want to put some R134 in my 300d but i dont know where my high pressure valve is located to hook up my gauge.

thanks for the help

Old 06-16-2001, 07:48 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Start at the comppressor, Follow the line to the condenser. There should be a high pressure fitting somewhere in the vicinity of the compressor.
Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.
Old 06-16-2001, 07:52 PM
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Join Date: Mar 2001
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What year is your 300D? If its a W124 the valve is located near the front driver's side in between the headlight and the radiator near the receiver drier. HTH
Scott Diener
89 300E
93 300E
92 Volvo 740 Wagon aka "Mutt mover"
Old 06-16-2001, 09:16 PM
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On my 82 300D turbo (W123) the fitting is in the center of the compartment under and to the left of the upper radiator hose. The radiator hose comes out of the radiator(facing engine) and bends left to cross and in front of engine then bends towards the back. The fitting is just to the left of this second bend.

Old 06-17-2001, 04:34 PM
The Bob
Posts: n/a
Thanks guys

I found it. I followed the line form under the compressor ont he passanger side of the car

thanks for the help

Old 06-17-2001, 06:39 PM
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Posts: 2,141
Are you going to try and charge thru the high pressure side?
Don't think you want to do that.
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC

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Old 06-17-2001, 06:42 PM
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Make The Right Choice

Brother of The Benz, The Bob
It's good to know where the schraeder valve fittings are, both high and low side of the system.
But, to add refrigerant to the system and to know what the evaporator pressure is, you better be concerned about the low side fitting.
Normally yoiu won't have concern about the high side as long as you don't over charge the system.
Good luck for even though R-134A doesn't cool as well as R-12, it does a good job.
Happy Trails Beep Beep from The Spiderman in Houston!!!
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