Came home from work today (20 minutes city driving), shut the car off, opened the hood to check something and after a few minutes I heard a boiling sound coming from the area around the radiator cap (no visible leaks). I could see the recovery tube move so I guess it was overflowing into the recovery tank. Normally the temp gauge (i know its not accurate,using it as reference) stays just under 210. While idling it went a hair over 210. I changed the water pump over a month ago and didn't have any temp issues after that. I used Prestone Dexcool 50/50 when I changed the pump. I checked the oil and its looks normal. Do I have a bad cap (original) ? Or is that 50/50 **** coolant ?
I'm waiting for it to cool off and will check the level.
I went back outside and removed the cap. Radiator was full and recovery tank was at normal level. I let the car idle for 25 minutes with my scan tool connected. When temp hit 224° both fans turned on. At 215° the fans turned off. I shut the car off and waited, didn't hear the boiling sound anymore. IDK
I took some coolant out of the radiator into a cup and compared it to some new coolant in a cup and you can tell the new is darker. Maybe too much water ?
I checked the coolant with a one of those coolant testers with the 5 *****. Its showed 3 ***** with the coolant from the car and 5 ***** with new 50/50 coolant. I guess the coolant in the car is a bit watered down. Also picking up a new oem cap tomorrow.
I believe that air getting back to the pump may play a role in the bearing seizing in the pump. I tried to do everything including putting it in a press and hitting the ratchet with a sludge hammer. I sheared the pulley clean off it was so seized