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low side pressure low

echeeves on Thu June 19, 2008 9:50 AM User is offline

Year: 2001
Make: Toyota
Model: Tundra
Engine Size: 4.7
Refrigerant Type: R-134a
Ambient Temp: 71
Pressure Low: 5
Pressure High: 90
Country of Origin: United States

what would cause such low pressure on the low side?
I know it has a low charge but looked lower than i have ever seen one.

GM Tech on Thu June 19, 2008 10:16 AM User is offline

Wait a few days, weeks, months and it will go even lower---as you loose refrigerant it will eventually go to zero or even vacuum-- you obviously have a leak- that needs to be found, fixed and recharged to factory spec.....my guess is you have about 1/4 of the necessary refrigerant in the system.....you don't want to run it in that condition for long- it will damage your compressor...

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

echeeves on Thu June 19, 2008 10:36 AM User is offline

ok, cool. i didn't know it would go that low and let the compressor kick in!
thanks
I will check for leaks and repair as needed

echeeves on Thu June 19, 2008 11:21 AM User is offline

I did not see any oil around fittings so I put some 134 with dye in the system till my gauges read 32 low 200 high. I will monitor for leaks. I have another question though. the low side on my gauges only slightly moves even if I disconnect the adapter. is this normal?

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