hello, I have a 04 gmc sierra, the ac compressor is cycling on and off about every 5 seconds. at first it was cycling and the high side was going to 400psi and cycling down. I removed some r134a and now i am cycling 50 to 75 low side and 75 to 100 high side. it is about 75deg outside. I have posted before this is the first chance i have had to look at the guages. when the low side goes low the high side goes high.
I am going to remove all refridgerant and replace the dryer but would like some advice if i need to check anything else while i have the system open. I will pull a vacuum and weigh in new cans, but i did this earlier in the year and it did not seem to help.
thanks,
Todd