The air con in my '91 240 won't start.
I have replaced air con relay,condenser fan relay,Dash switch.With spares I had on hand after checking for dry solder joints,which I repaired if I found some.
Direct power to compressor clutch does activate clutch.
Bridging low pressure switch did nothing,even after lifting revs.
The light in the dash switch was previously working but has given up.I replaced the bulb with known working bulb.Still not working.
I know the bulb forms part of the circuit but I'm confused by it working before but not now after swapping out AC relay.
I pretty sure there is very little gas in the system if any but I believe bridging the low pressure switch would have a result.It did not.
I haven't tried the high pressure switch because I thought it would no effect without hi levels of gas in the system.
The air con uses R134a( I think,will check the sticker)
What am I missing??
I want to make sure it's going to work before going for re-gas.