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134a temp and pressures

jlb27537 on Sun June 26, 2011 6:10 PM User is offline

Year: 1996
Make: Safari
Model: Sahara
Engine Size: 300 CAT
Refrigerant Type: 134a
Ambient Temp: 90
Pressure Low: 45
Pressure High: ??
Country of Origin: United States

Hi Guys,

I had my TXV and dryer replaced couple weeks ago. Low side was 45. Not sure of high side. In shop duct outlet was 60 degrees. Shop temp about 90.

Took trip, air temp 90. Duct temp was 60. Road speed ram air over condenser made no difference.

I found a chart that" I Think" says that @ 90 degrees, low side will be 45-50psi and high side will be 250-270. @ 45psi on the low side the temp of the evap will be 49.61 degrees. Thus the 60 degrees out of the dash is about right?

Question: Since this is a motorhome, the proper charge amount is unknown, do you think it is doing all it can do, or should I expect some more cooling capacity?

This is the first summer I have been in these temps. In past summers, I have been in cooler locations, 70"-80's.

Thanks Jim

bohica2xo on Sun June 26, 2011 6:19 PM User is offline

Refer back to your original thread here:

You still have no high side pressures. Impossible to diagnose fully without them.

You are likely undercharged, as I said in your last thread. The "chart" you found is meaningless drivel - if all you could get out of a system was a 30 degree delta, we would never have frozen food.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

jlb27537 on Sun June 26, 2011 8:49 PM User is offline

Thanks, I'll get high side and get back to you. Jim

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