I need some help getting the name of this part for the AC, it has frayed and degrading wires and I need the name of it so I can find replacement wires. (or even better if anyone knows where I can find those two wires with the quick slides on the top of the part that would be appreciated)

 

thats the pressurestat..... its a switch that opens if there is insufficient refrigerant pressure. the signal comes from the AC switch on the dashboard, goes through that switch, some years it also goes through another switch thats on the condensor manifold at the bottom of the left side of the radiator (this one opens if the pressure is TOO high), and then goes on to the compressor clutch. you just need to trace and replace those wires end to end....

what year 240 is that? every 240/740/940 I've seen, the receiver/dryer unit is near the firewall on the right (passenger) side of the engine compartment, yours looksl ike its right next to the radiator??

 

I have a 1987 244, and that is right behind the passenger headlight.

 

weird, we had an 87 240 sedan, and I'm almost positive it was in the back of hte engine compartment, near the firewall. but that car has gone to the great crusher, may it rest in pieces after going 500K miles...

 

Sure - those are wires going to a switch that tells the compressor to turn off if the pressure is too low (on the high side)

- that's a r12 factory installed quick fill valve in the pictures - has your system been converted to r-134?

I would just bypass the wires at the compressor and not worry about it. If the ac stops blowing cold- then turn it off before other damage happens! - that is what the switch and the wiring do. Or make up a pair of wires going to the compressor and back.

 

Afaik I still have r-12, my AC blows but not cold so right now this is to fix an electrical problem and not the AC (although if this does fix the AC too I won't be too upset)
Also maybe I'm misunderstanding but in my car, it seems these wires do not go to the compressor, mine seem to pass it and go deeper into the engine bay.

 

That wire harness goes across the top of the radiator area and comes out near the air filter - there is a green wire coming from the firewall located down near the compressor (that is plugged into one of the low pressure cutoff switch harness wires) - that green wire goes to the ac relay and provides power to the compressor. Unplug the wire at the compressor and plug the green wire from the firewall area directly into the compressor, bypassing the low pressure cut off switch and the damaged wiring.

The routing of the wires is illustrated in the diagram in a previous post. Volvo no longer sells a 3515729 so either bypass them (free) or make some new ones up (not free).