85 Sedan De Ville question

I recently had my Coolant Temp Fan light come on my 85 Sedan De Ville, (it did not stay on). I checked the coolant levels, they are fine. I let the car run to see if the fans come on, they do. When I shut the car off, the coolant bubbled a bit and the level rose in the overflow tank, but not a lot. My other question was the service engine soon light flickered on the same day. i recently picked this car up, it seems to run great, Very low miles (64k), in great shape also. Anybody have any suggestions on what I can look for or do next? Change the coolant out? Put in a toggle switch for the fans? I'm not a mechanic, just trying to keep my means of transportation on the road without paying mechanic bills. If you want to email me if you don't mind at : tazzsmom2@aol.com. or just reply here and I will check back!
:smile: Thanks!

Welcome to AF. Many things can cause this, bad thermostat, bad radiator cap, partially clogged radiator, keep in mind the HT4100 was a troublesome engine from day one. Assume you mean coolant temp lite there is no fan lite as you stated. There is a way to do self diagnostcs thru the ac control head to see if there are any codes. 25year old car here, was the coolant ever flushed, any service records?

Hi, thanks for the answer, I will start checking and just so you know. the idiot light does say "coolant temp fan" I have never seen such a thing myself either, that is why i was surprised and not sure where to go with it! No service records, I will starts with the easy and work my way out from there. Thanks a million!