Low side pressure way too high!

[MabenAndy]

2006 Accord LX sedan with 2.4l. Replaced ac compressor and condensor coil with new Denso. Replaced expansion valve and two rubber hoses with 4 seasons brand. Pulled vacuum and it held overnight. Put one 12oz can of 134a into the system. Im getting 45 degree air out of the vents. However, low side pressure is nearing a steady 100psi. High side is almost 150psi. I did not replace the evaporator coil. Any ideas why low side is so high?

[JohnHere]

It's impossible to get 45°F air out of the center dash vents with a low-side reading of 100 PSI. Are you sure your Manifold Gauge Set is registering the correct low-side pressure?

For reference, your car's A/C specifications are as follows: 19 ounces net weight of R-134a, and 5.5 fluid ounces of PAG-46.

[Zardiw]

Make sure both valves on the guage set are Closed.......You probably have the high side valve a bit open and it's bleeding through the manifold....

Z

[tbirdtbird]

Or the coupler is not all the way on