R4 Compressor Cycling Issues

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

84 Silverado

Junior Member
Joined
Jan 10, 2023
Posts
21
Reaction score
20
Location
Dallas
First Name
Tod
Truck Year
1984
Truck Model
Silverado 1500
Engine Size
350
Team,
Working on my 84' AC system. I filled the system with (AC Pro purchased at Orileys) 134A. Once the guage was in the green (see pics) the compressor cycles on and off very quickly when the Low pressure switch is wired up (see pics). When I bypass the switch (see pics) the compressor stays engaged.
The low pressure switch is brand new (see pic). I know very little about AC systems, and I'm obviously missing something here.
Any help would be appreciated.

Thanks in advance.
 

Attachments

  • IMG_4431.jpg
    IMG_4431.jpg
    190.4 KB · Views: 27
  • IMG_4432.jpg
    IMG_4432.jpg
    113.7 KB · Views: 26
  • IMG_4433 (1).jpg
    IMG_4433 (1).jpg
    126.9 KB · Views: 26
  • IMG_4434.jpg
    IMG_4434.jpg
    108.1 KB · Views: 27
  • IMG_4435.jpg
    IMG_4435.jpg
    175.7 KB · Views: 24

bucket

Super Moderator
Staff member
Super Moderator
Joined
Aug 3, 2010
Posts
30,311
Reaction score
27,926
Location
Usually not in Ohio
First Name
Andy
Truck Year
'77, '78, '79, '84, '88
Truck Model
K5 thru K30
Engine Size
350-454
Three things:

1: Don't ever use that AC Pro garbage. ONLY use refrigerant that does not include stop-leak.

2: The pressure gauge is ONLY useful when the compressor is active. It basically means nothing when the compressor is not running.

3: Ditch those wire nuts.
 

fast 99

Full Access Member
Joined
Dec 31, 2021
Posts
1,982
Reaction score
2,835
Location
Spokane, Washington
First Name
Brian
Truck Year
81,85
Truck Model
K20
Engine Size
350
Generally rapid cycling is caused by low pressure on the suction side.
 

Latest posts

Forum statistics

Threads
43,949
Posts
946,350
Members
35,999
Latest member
Clusterfked
Top