my evaporator freezes, why

[oldbud]

2000 gmc jimmy the air conditioner works for about half an hour then stops. a
mechanic told me the evaporator is probably freezing. If it is what can I do
to fix the problem?

[Ashton Crusher]

On Mon, 22 Jun 2015 03:17:59 +0000, oldbud

Post by oldbud
2000 gmc jimmy the air conditioner works for about half an hour then stops. a
mechanic told me the evaporator is probably freezing. If it is what can I do
to fix the problem?

Why didn't you ask the mechanic? Assuming nothing is actually broken,
evap freezups can be caused by having a low refrigerant level. Any
competent AC shop, or even a gas station doing simple AC work, can
check for leaks and top up the system if there are not any large
leaks. You could easily have lost enough refrigerant in 15 years to
need a top up and nothing else.