72ray

72ray
Casual User
Aug 7, 2018
80
68
Sydney Australia
VetteCoins
2,061
Car
1972 coupe 350 TH400
Hi legends,
I’m sure somebody here can IDENTIFY and EXPLAIN this electrical connection that joins my
a/c compressor +ve power supply (dark green) what the wiring diagram I have says is the low pressure switch. Apologies for my electrical ignorance in advance.
 

Attachments

  • iOS Image - 368180808.jpg
    iOS Image - 368180808.jpg
    346.3 KB · Views: 33
  • iOS Image - 2379098448.jpg
    iOS Image - 2379098448.jpg
    340.5 KB · Views: 32
Took me a few minutes to recognize it (haven't seen one since my parts-guy days 20 years ago ) but that is a thermal limiter fuse. Paraphrasing a bit, but when there is improper refrigerant flow, causing too high a temp, the normally open pressure switch will close and send current to this fuse which then melts and opens the clutch circuit. GM has not used them since late 70's.
 
  • Informative
  • Like
Reactions: 72ray and ddgermann
Not a hundred per cent sure about all three but if it is not melted internally, there should be continuity across at least two of them.
 
  • Like
Reactions: 72ray
Old Thread: Hello . There have been no replies in this thread for at least 100 days.
Content in this thread may no longer be relevant.
Perhaps it would be better to start a new thread instead.

Users who are viewing this thread