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 Old 07-09-2018, 08:44 AM   #1
 
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Default A/C - Pressure on high, not on low. Compressor turns off

Hello,
I purchased a 2012 speed3. AC didnt work. Refilled with 12a and it worked for a week. Cool air started to warm and a day later it stopped working. Noticed compressor was not engaging.
Thought there might be a leak. filled with dye. could only find leak on HIGH port valve stem. I replaced valve stem and filled again with 12a and dye. Couldn't find second leak. Ended up adding to much 12a and relief valve blow. Replaced valve, filled, same issue. no cold air, no sign of leak. Compressor was doing a couple revolutions but then turning off. hooked up some borrowed gauges and jumped the relay to force compressor to stay on. No real movement on pressure.

Tested relay. looks good.
Cleaned pressure sensor connectors to be safe.

Replaced Compressor, ran vacuum, refilled, there seem to be some pressure movement on high side but not really anything on low. no leak was detected while on vacumm

Starting to think maybe something is clogged?? while trying to turn on and off, refilling over and over again i do feel heat on high side pipes but nothing on low side pipes. Thinking about replacing dryer.

Which direction does the fluid travel? Maybe i should do a flush in opposite direction of flow and maybe get lucky and remove blockage if it is blocked/clogged?

Thoughts, please?

Last edited by rdtk1; 07-09-2018 at 08:57 AM.
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 Old 07-09-2018, 12:05 PM   #2
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Those sound like similar symptoms to my car. I just swapped the compressor (which had a bad clutch), and a new condenser into my MS6. There was clearly a blockage in the condenser, resulting in a hot inlet pipe, and no discernable temperature above ambient on the cool side pipe.
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 Old 07-09-2018, 12:14 PM   #3
 
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Thank you so much for your reply!!
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 Old 07-16-2018, 12:43 PM   #4
 
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Okay AC is fixed.

-Ordered new drier/receiver and ac system flush (1L)

-I removed the drier/receiver
(bolt was seased and was trying to take condenser line with it. tried heat, penetrating oil, tapping wrench, cordless impact. Ended up using impact wrench from air compressor set at 25psi with wrench on low and got it off.)

-disconnected ac high and low lines from condenser and compressor.

-Back flushed condenser, then forward flushed, then back flushed.
(poored liquid then used air compressor to clear.)

-Flushed high side line from compressor to condenser

-back flushed low side starting at the line that i disconnected from condenser, through evaporator, sensor, to the disconnected condenser.

-installed new drier/receiver

-cleaned up all bolts, added anti-sees, and lubed o-rings.

-reconnected everything

-vacuumed for a good 20mins (no visible leak from vacuum)

-added 1 can of redtek oil. (noted cold air coming but not enough)

-added 1 can of redtek 12a until pressure on high side was 175psi and then stopped filling.

And cool air, thank god!!!! so satisfying.
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