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Replace my engine & now When I fill my ac up , when I’m on The second can The compressor release it from The pressure valve on the Compressor ??
 

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you have a restriction in the piping somewhere, when the compressor kicks on it sees to much pressure and vents out!

Make sure there are no bends/kinks/dents in the A/C lines esp by the front bumper and condenser. Did you replace the drier unit when the a/c was apart? If not it's full of water and probably running the a/c system. Be sure you have it under vacuum pressure for 2 hours min to make sure all the moisture is out.
 

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Replace my engine & now When I fill my ac up , when I’m on The second can The compressor release it from The pressure valve on the Compressor ??
1. Are you filling using 12 oz cans? The MDX only takes abour 22 oz, which is a bit under two cans.
2. Did you vacuum the system before putting the first can? in other words, Was the system on almost FULL vacuum when you put the first can?
 
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