I have dodge grand caravan 2008, my AC is blowing relatively warm air (12 Celsius), after checking LO side presume it shows (50 PSI) at (1500 RPM) is it over charged and if I will check the HI side , what will be the pressure in PSI finally any additional information will be good
Thanks

 

Being a 2008 Any warranty left?
have you added any refridgerant?
You always need the HIGH and low side readings.
With 50psi (static) I suspect there is more info to add.
Is the CEL on? some issues will disable A/C
When the A/C is selected- can you hear the comp. engage also will the eng fans come on when A/C selected?

 

What I like to see is 32 PSI to 35 PSI on the low side and 190 PSI to 225 PSI on the high side, at around +80F ambient. 50 PSI is to high on the low side.

 

many many thanks for the reply
let us say 32 to 35 PSI at ambient +80F
I am wondering is it at idling speed of the engine (800 RPM) or the reading should be checked at a higher engine idling say (1500 RPM)
in case the ambient temp would be +90F, what will be the readings
Thanks again

 

you will need both readings both HI and LOW

Vabear suggested a 32-35 psi WITH compressor running- will fluctate as comp cycles
A ball park figure for the HIGH is 2.5x ambient...ie 90deg= 225 high side.
always want low as vabear mentioned.
you are correct readings at @1500rpm

 

A good reference site is www.aircondition.com