Hi all,


I have 2010 explorer. I have to add almost 200 ml of coolant in my reservoir every week. there is no sign of leak from anywhere even at thermostat manifold as well. but one question, when the car is running for at least 1 hour, the coolant level at reservoir shall be around FULL HOT Level and when car cools down overnight, it should be at around FULL COLD LEVEL. is it right? if yes, then my level remains little more than FULL COLD when the car is hot and when it cools over night, level goes little down than FULL COLD. like this every week I have to add almost 200 ml of coolant. radiator CAP is okay and I replaced it few months back. no apparent sign of leak.
any clue what can be reason?

 

There are two possibilities... one is that you have a small internal leak and the motor slowly burns coolant........... the other possibility is the tank is too full and when it expands the pressure cap pops and lets a small amount of vapor into the air........ Your understanding of the fluid level is correct, but for a test I would keep the level slight lower for a test... Don't add any fluid for 2-3 weeks and see if the level continues to drop or just stays at a lower level forever. If that is the case, then continue to operate the car using the "full cold" mark as the hot level.

 

Hi,


thank you for your support. I will do this test as you said and will share the results for sure..