pwood999

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• Aug 16, 2023

• #21

With that static pressure it should engage, provided the trinary switch is in position-3. The connector is a bit exposed, so does suffer corrosion.

It also depends if you have an early direct HEVAC feed, or the later relay version. Early HEVAC checks for compressor current, and will not engage if it's too low.

 

pete12345

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• Aug 16, 2023

• #22

It’s got the relay late hevac system and a new trinary switch fitted will check that out again make sure all connected properly cheers

 

pwood999

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• Aug 16, 2023

• #23

Make sure the relay actually switches. The switched 12V from the relay goes via the trinary switch to the compressor (White / Light-Green wire). The other side of compressor is grounded (Black wire).

The relay wiring depends on year. Later cars have the wiring in the loom. Early cars with later HEVAC will usually have the LR special loom !!

 

pete12345

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• Aug 16, 2023

• #24

Yer mine got green & white other one black out of harness thanks

 

pwood999

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• Aug 16, 2023

• #25

This is the later wiring diagram. Check for relevant voltages through the chain.

 

pete12345

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• Aug 16, 2023

• #26

thanks pwood999 I’m not good at electrical but have spoken to my local Indy and he’s going av a look at it for me but as most good ones they busy but will get it sorted then sort out the respray