A/C low side pressure to Hi - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 06-28-2005, 10:27 AM Thread Starter
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Date registered: Jun 2005
Vehicle: 86 190E 2.3L 16V, 93 400E, 95 320TE, 95 E320, 98 S500
Location: Seminole, FL
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A/C low side pressure to Hi

I recently purchased an 86 300E with 109,000 on the clock. A/C compressor was bad, so I changed it out and also replaced the expansion valve, accum/dryer, pressure switch and fan switch. New valves to convert to 134r. All went perfectly for about 3 months.

In the last three weeks, the A/C wasn't blowing very cool. I checked the system and have about 90 - 110 lb.s of pressure on the low side. I believe normal should be 30 - 40 lbs. I have flushed the condenser, evaporator, replaced both the expansion valve and accum/dryer.

Still holding hi pressure on the low side.

Any ideas or solutions? What am I missing?
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