noticed Saturday its getting up to the half way point and not really cooling down much from there. I changed the thermostat because i have been meaning to do that anyway ( stuck with the stock temp) and the coolant temp sensor wasn't reading the best when i tested it so i put another one for GPs. now that i have changed those and gotten the air out of the system its better but noticing that when it gets to the half way mark on the gauge like always, it turns on the right fan, then its cools down but it takes it's ever loving sweet time doing it. turning on the A/C at that point.turns off the right fan and turns on the left fan. turn off the a/c and it goes back to the right fan only. i was thinking they should both be running when its hot, but maybe i am mistaken. my old FSM for my truck had full explanations as to what happens at what point in the operation but my current manual doesn't ( i know, i know ....shoulda invested in a REAL one )
when i had this issue with the 94 Concorde, the water pump was making noise and you could tell. but I'm wondering at this point if i have a fan relay or radiator issue. I'm going to go out in a few and wash out the radiator fins to make sure I'm getting good air thru it. Any other factors i should be looking for? this damn thing has 139,000 on it. i called the service guy at the dealer i bought it from right after buying it 2 years ago(same one the old lady that had it before had taken it to for all her work) and they had service records of changing the water pump around 49,000 or so, but it could need another one, especially after all the torture i put it through in big city traffic day in and day out ( Florida weather is hell on it too).