[Russ Bellinis]

Before adding more parts to your car, have you run a jumper to your fan? You mentioned that the fan comes on with ac, but there are 2 fans and only one is in the ac circuit. Have you run a jumper from the battery to the other fan to make sure it works? In case one of the switches breaks ground make sure that you use 2 jumpers, 1 to the positive for the fan the other to the ground side. From there trace power back from the fan with the engine at temperature. Testing for power should locate the exact place where you are losing power. Even though you replaced switches and sensors, it would not be the first time that one was bad out of the box.

 

[Russ Bellinis]

It sounds like someone who didn't know what they were doing did some rewiring on the fans. If both fans come on with ac, it may be that neither one is hooked up to the engine temp sensor. If you are getting overheating in heavy traffic with the ac off, the fan wiring may be your problem.

Be careful of the overheating. One problem that has been mentioned often about the 3rd gen hemi engines is the tendency to drop valve seats when they overheat. If both fans come on with the ac, you may want to consider running the ac all the time until you have time to check the wiring. If the outside temp is too cold to run the ac, just turn on the heater with the ac.

 

[Russ Bellinis]

I don't think I would drop your settings any lower than where you have them now. I had a 1987 Firebird Trans Am, and had my fan set to come on a 195 and cut off at 180. It worked fine even in the Mojave Desert even if idling in traffic or climbing Cajon Pass in mid-summer. I could watch the fan cycle on & off by the temp gage. The temp gage on my Magnum R/T doesn't cycle as quickly as the gage on my Firebird did. Also, my Firebird had numbers on the temp gage, but my Magnum only has lines.