Automotive Air Conditioning Information Forum (Archives)

Provided by

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

2003 Toyota Sequoia A/C; Excess hi/lo pressure

butter on Tue August 30, 2011 6:38 PM User is offline

Year: 2003
Make: Toyota
Model: Sequoia
Engine Size: 4.7
Refrigerant Type: r134a
Ambient Temp: 92
Pressure Low: 70
Pressure High: 350
Country of Origin: United States

Dual A/C
Low Side (36-51psi normal per Toyota manual)
High Side (275-305psi normal per Toyota manual)
Vent 60F at idle, 50F when driving.
Cloudy sight glass.

The above result is after having done the following:
- recovered the system
- replaced receiver (added .7oz PAG46 per Toyota manual)
- evacuated the system (no leaks detected)
- charged with 36.8oz r134a (37.03 +/- 1.75oz specified per Toyota manual)

Any thoughts on the cause of excess lo/hi pressure with correct r134a charge? Had roughly the same symptoms before the evac/recharge, and thought maybe previous owner had gotten air in the system somehow, but now I am stumped. Too much oil in the system? Expansion valve problem? Clearly I am an amateur, but am here to learn.


TRB on Wed August 31, 2011 12:08 AM User is offlineView users profile

Spray a little water on the condenser and see if you pressures drop and you have better cooling. Check that the fan is working correctly also.


When considering your next auto A/C purchase, please consider the site that supports you:

Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.