Hello people, new member here. I'm sorting out some issues with my new-to-me 2002 4.6is. I recently replaced my radiator, upper and lower hoses, and coolant temp sensor in the lower hose. Ever since, my air conditioning hasn't worked. I used to use it every day up until now. The compressor clutch is not engaging. The snowflake light does illuminate on the HVAC panel, and the engine RPM increases the idle by about 50 rpm when AC is turned on.

Can this really be a result of the work I did with the coolant system? Or is it just a coincidence, or better yet an act of spite by the E53 gods...

-My aux fan does not do an initial spin on cold start
-If high pressure AC switch is unplugged, I do get super high speed aux fan


I've read a lot of conflicting things on this forum about the preconditions needed for compressor clutch activation. Some say the fan matters, some say it doesn't. Some say the coolant temp sensor plays a role, and for some reason air pockets in the coolant can even cause the AC to not activate. I'm hoping someone really has a definitive answer. Am I missing something here that can be related to my cooling system work?

My next step is to get the proper equipment to scan all ecu's for DTC's. I'm guessing there should be something relevant stored in either DME or in the HVAC system. Hopefully I can get something this week to scan it.