Hanky I found the correct port because it will only connect to the correct port. Done what was instructed on the Freon charge kit. Gauge needle went straight to red danger area. Disconnect Freon kit from F250 got the key to my GMC Canyon because I know it was low on Freon connected Freon kit to the GMC and it showed 30 psi pressure. So I went on and charged it up so I wouldn’t be out of 60 dollars for charging kit. Any ideas why it would show high pressure twice when I connected it to F250.

 

The ports have 2 definite sizes to prevent accidental connection to wrong port.

Just to be sure, the low side port is smaller than the high side port and the low side port has an BLUE cap on it.

If you were connected to the correct port LOW SIDE- BLUE, and you had pressure OVER 80 psi with engine off OR over 80 psi with compressor running, there is a restriction in the condenser OR the system is severely overcharged.
Please tell me how you connected the charge line to the port ?
Were you successful charging your other vehicle?

With the engine idling, A/C requested on MAX cold,, blower on hi setting, 30 lbs is good and it should cycle down to 30 shut compressor off pressure go up to maybe 40 -50 and compressor should cycle on again
Do you have a set of manifold gauges or does the kit gauge provide those numbers ?

 

Yes sir I cranked engine set the A/C settings to max and fan blower motor to high connected to low pressure side. The caps are black on the low and high pressure ports I followed the large line from the compressor to the port in line
near the passenger side fire wall and connected to that port
yes my GMC was low on refrigerant guage showed 30 psi and I charged it to 45 psi
I knew it was low on refrigerant and has been for awhile. GMC cooling very good. When I started this thread first thing I asked could it be a clutch fan problem. With what you said about the condenser I’m thinking I may have a air flow problem
I don’t have manifold gauges

 

There are times when actually being there can make a difference.

If it were a gas engine you could hear the difference when the fan clutch engages, but with a diesel the engine noise makes it harder to hear the difference.and you need to be observing the fan.
I believe you are right when suspecting the fan clutch.
On your engine the PCM controls the fan clutch. If it is not coming on when required, it should set a code in the PCM.
It does utilize a fan speed sensor and is duty cycle controlled.

You will need to have the PCM checked for codes, and if there is a problem with the clutch assy, special tools are required to replace it.
Before spending anymore $$, a qualified shop with the tools and experience should be considered.

 

Thank you sir for your response. I live in North Carolina and it has been one of the hottest June that I can remember. This morning it was 80 degrees at 7 AM. Thinking it may be an air flow issue, I washed the condenser coil with garden hose for 15 minutes or so. Of course I know to clean it correctly I need coil cleaner.
I drove up to my lake house which is about an hour drive and the A/C seems to be working some what better. The ambient temperature was 88 degrees and I had to make a few stops at stop lights and the A/C at idle was cooler than it has been. Yes it still could be clutch fan issue. I have a cheap OBD 2 android on my phone that I use to reset fault codes on my GMC for evap codes when I have it inspected
do you think it may show a stored fault code
or would I need to have it checked by another source?

 

We won't know until you try .

 

Hanky been busy cleaning up after storm we had here
P0529 fan sensor fault code
P0480 cooling fan control circuit malfunction
as you know major codes
P02E0 diesel intake air flow control control circuit range

 

The better thing to consider is to first check for any corroded or loose electrical connections to the fan clutch wiring.

That means unplug and physically look for any corrosion or pushed out pins on the plug.

If nothing definite is found, the circuitry will need to be good and sensor working correctly.
This may be something where a qualified shop would be a better consideration.

 

Thank you for your support. Got a call in to my tech I trust for an appointment

 

Hey Mr. Hanky problem solved. Coolant fan connector was not connected. Had fan belt replaced back in February. Don’t know if tech didn’t get it fully connected if he even disconnected while replacing belt. No need to argue about it. Again thanks for your help and advice sir