1999 RD688 A/C

[Big red 2]

I have replaced every component of the a/c and it seems to work ok but not good enough.  Anyone have any ideas how to maximize or get more out of the a/c?  

Also, a ton of hot air comes in from the drivers side firewall.  Any idea how to keep that air out?

 

thanks

[Darin]

Check rubber boot were steering shaft goes out firewall i have this problem on rd690s

[br549]

If all pressure are running good, I would ck  and make sure the heater cut off valve is working right.  If its got the manual water valve and the water manifold, cut if off.  Pull the duct from the fan motor to the control box and make sure the core  is not filled up with dirt.  On R models if in dump truck and dirty environment  we unplug the outside vent  to keep if from pulling in so much dirt into the core.  Also ck and make sure the thermostat is no cutting off the compressor to early.  Most of the time we find the core stopped up with dirt.