I have normal temperature indication while moving, but when stopped in traffic, it sometimes shuts off the A/C because the engine gets hot, despite the fan revving away. Outside air temps have been in the high 90's, early 100's. I would replace my stock fan with a higher CFM rating, if I knew there were any that out-perform the stock one. thanks for taking time to answer people's tech questions- It's a nice contribution that saves people money and/or trouble. -Jeffy.

 

Check your radiator anti-freeze it might be low. No problems here, the last two days in the high 90-100 range. I don't think the fan's output is the problem, however, it may not be turning on soon enough the thermostat might be defective. Have your dealer check it.

retroom

 

Yesterday, here in AZ it was 120. The Cooper's AC was crap but my temp gauge NEVER moves. Suspect something else besides the fan.

 

Upper 90's here and engine temps never move... stays right in the normal range.. and AC works great!

Things to check:

Make sure your fans are working in both high and low speeds. There is usually a relay for both. Be sure your radiator is clean and not being blocked by debris.
Your thermostat might no be openning up all the way... You might want to replace it if everything else seems fine.

 

The stock fan move a great deal of air, especially when running at it's high speed. I installed a 'real' temp gauge (sender in the block drain plug location) since having Nav steals even the near-pointless temp gauge for a light. Even in these hottest of temps lately, the car will idle at around 200* in traffic with the a/c on full blast. These observed temps are within a couple degrees of OBDII scanner readings of the coolant temp at the head.

Shutdown of the a/c at idle can be caused by system refrigerant overcharge, low alternator output (the fan running at high speed, coupled with the a/c blower, clutch and other accessories puts a real strain on the alternator, calling on the battery to pick up the slack) insufficient airflow through the condensor coil or low idle speed. Make sure that the radiator fan shroud air shutters are not missing or hanging open, the fins of the condenser are not grossly bent and no other obstructions to airflow exist.

 

I have a 180 thermostat, and the engine runs better if the temp gauge indicates a bit below the half way point. It can do it if I'm running on open road, without the A/C on, but not with either A/C running or in stop and go driving. So, I have enough cooling air on the freeway, but the cooling fan cannot duplicate this. By the way, it does run at both high and low speeds-mostly high speeds in this heat. -Jeffy.