Wire Fan to A/C Switch
 

Temp switch on upper rad hose should be place so its on the side or lower part of the hose in case coolant gets low, these "sensors" can't read air temp just liquid temp

AC systems use 12volt activation, the Volvo system uses Ground activation,so no they can not be hooked directly together

You need a 12v relay to activate fan with AC on, because your temp switch is a Ground control switch, which Volvo Dual speed switch should be, like this diagram: https://www.jeepz.com/forum/attachme...lvo-wiring.jpg

The AC clutch will get 12v when activated, you will use that 12v to activate the added relay, relays are low amp draws so it won't cause AC Clutch fuse issues
The relay will be a Ground Relay, so when off no ground, when on grounded
This will be hooked to low speed ground wire on temp switch, or high, your choice

Standard automotive 12v mini relay looks like this: https://www.gtsparkplugs.com/images/...iring-840x.jpg
This is a 5 pin relay, but you don't need the 5th pin so can used a 4 pin relay, it doesn't have 87A
85 and 86 are used to active the relay, if one is grounded then 12v on the other activates the relay
When activated 30 and 87 are connected together

So you will run a ground wire to 85 and 30, so both share the same full time ground
Then 1 wire from AC Clutch 12v wire to 86, to activate relay, splice it to the 12v wire
And 1 wire from 87 to temp switch Low or high ground wire, splice it to the temp switch wire

When activated it will be the same as if the temp switch activated the fan, grounding the Volvo relay for that speed
And it won't effect temp switch operation when AC is off

12v 30/40a relay WITH wired base(plug in) are $20 at most auto parts stores, online 2 for $15

Thanks @RonD. I ordered switch from Amazon today and will wire this up when it comes in.

Back in business. Thanks @RonD for keeping me cool this summer in NC.