Engine Size: 5.3L
Refrigerant Type: r134a
Ambient Temp: 77
Pressure Low: 30
Pressure High: 125-175
Country of Origin: United States
High guys, I have a 200 tahoe that doesn't cool real good while idling. It takes about 6 miles of driving at 55mph before it starts to cool really good. I took some high and low side reading at idle and at 1500 rpm. Here are the readings
Idle 500 rpm 77Degrees ambient
high side 150
low side 25
vent 42 degrees
Here are the readings at 1500 rpm.
1500 rpm 77 degrees ambient temp
high side 125 to 175 The pump would cycle off and on here, cycle off and pressure go to 125 and cycle on and go to 175 and the cycle off and repeat
low side 30
vent 46 degrees
Like I stated, the compressor would cycle off and on at 1500 rpm, is this normal? blows really cool when you drive it but when really hot outside doesn't cool well at first start up and let it idle for a bit. What I mean by this is, if I go out at 2p.m. before work and temp outside is 90 degrees and I start tahoe to let inside cool off for a few mins before i go to work, it usually is'nt cool, takes a bit of driving to get it cool but works great after i drive it a bit.
Are you sure the compressor is cycling off in relation to high side pressures? Unless you're sure that low side stays at 30 the whole time, I think it is more likely that it is cycling on low.
Usually when a system runs well while driving, and sucks while idling, it's an indication that the condenser is not getting enough airflow at idle.
However, I would verify that your system has the correct charge before digging any deeper. Pressures seem a bit low to me, but automotive is not my area of expertise.
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