Ok, have driven the car this morning to the store. 3 miles each way.
Had to top up the reservoir before starting the car. Slightly above the max line.
So, the first 3 miles went well. Heater and A/C worked great. Checked levels and all was good, no signs of overheating (95 deg outside today). Car sat for 10-15 minutes while I was in the store.
Driving home after about 2 miles noticed fan noise, 2nd fan must have kicked in. Then noticed wet tire track in rear view and A/C went warm. Wet tire track gone after about 1/2 mile but A/C warm all the way. Popped the hood, sound proofing above reservoir was wet again.
Doesn't make a lot of sense to me.
Any ideas?