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not cool enough

Jimmy D on Sun June 21, 2009 1:24 PM User is offline

Year: 1997
Make: Chevy
Model: Suburban w/rear air
Engine Size: 5.7
Refrigerant Type: R134
Ambient Temp: 92
Pressure Low: 39
Pressure High: 210
Country of Origin: United States

Hi guys. A little history on my truck:
replaced original compressor 3 months ago with new one ( no catastrophic failure, just old and weak)
pulled vacumn at that time
recharged with R134
has been working pretty good until now that the heat is on. Better cooling at night than day.

Right now it's sitting in the shade with 92* amb temp
at idle it reads 39 low side and 210 high side with 62* center vent temp with fans on high and max setting
at 1500 rpm it reads 26 low side and 205 high side with 55* center vent temp
compressor is not cycling
clutch fan is operating normally
engine temp is running normal
condensor and radiator appear to be clean as far as bugs and such
with system turned off the pressures equal out at 80 each

comparing these readings to the 134 Pressure Temp Relationship chart I found on this site mine looks like it's in the ball park
my 97 excab pickup blows 38* in mid day heat, why won't the Burb? Thanks.

Chick on Sun June 21, 2009 9:48 PM User is offlineView users profile

static of 80psi, especially in a warm engine compartment at 90 ambient would be very low, you might want to recover and recharge into a deep vacuum and test now that it's warmer out. While the system is empty, pull and check the o tube.. let us know what you find..
PS_ Static pressure should be over 90psi at 90 degrees ambient... I don't have the chart here at home, but it's usually close, or higher than the ambient temp.., including engine bay temp..

Email: Chick


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HVargas on Mon June 22, 2009 12:48 PM User is offlineView users profile

I agree with Chick. With that high of an ambient temperature you should have a higher static pressure. Recover the refrigerant and see how much you get. You might be surprised. Also a good idea to check the orifice tube while it's empty.


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