A a/c system usaly blows colder when driving then sitting still, so i do not think its a freon issue ,,, it sounds just like a car that is overheating , like it has a stuck open t-stat .
take it for a driver and look at your temp gauge ,,,does the temp gauge go to hot at the same time the a/c starts to blow warm ???
check the coolant reservoir ,, is there coolant in there ??
Who did the recharging on the a/c system ???did they do other work to the truck also ??? like to the cooling system
we can go back and forth on this page
Take your time and get back to me when you can ,,, the only other thing is that if they over charged the system ,,then you will get the consern that you have ,, but tell me what happens after your test drive
Ok --if the a/c compressor is going on and off fast on high blower then this is a sign that the system is low on freon .. with a system that has the proper freon level , on high blower the compressor should stay on all most all the time and never go off
When I service an a/c system , I have to hook up a machine to the low side and high side service ports and doing this may make a leak in the system after I remove the machine ,, the service ports stick and the freon leaks out ,, or they just did not put the proper amount in the system ,,,
It does sounds like a charging issue and would bring it back to them and have them re service it and make sure the service ports are not leaking ,,
I just got your other post ----when I look at a a/c system ,,I am looking PSI on the machines gauge ,, like the low side should be at 30 psi and the high side at 211 pis ,,,,so the gauge that you are useing is not a real good way to diag an a/c system
NO --there is no danger ,,, fill the system on the low side service port ,,with the truck on and a/c on ,,also on high blower ,, so it will take the freon easier
No problem ,
come back and see us again