2006 Ford Explorer Q&A

2006 Ford Explorer Question: Reservoir for the radiator keeps emptying out below the full level. No leaks

are evident. I did lose heat once. What could this possibly be? -
Answer 1
Have it pressure tested, and the cap tested. -
Comment 1
Thank you for your reply. Our mechanic said he did notice radiator fluid on the radiator and I think he said the engine too but he couldn't find a leak. He couldn't get a reading when he checked the pressure. I hope this makes sense. -
Comment 2
No pressure drop? Might check with engine running to make sure as well, engine at operating temp. Suggested cap, might not hold rated pressure, coolant on radiator is a good sign, just want to be sure engine isn't building more pressure then rated capacity of cap pressure rating. Thanks for checking back. -
Answer 2
Steaming from exhaust or any misfire? Misfire on cold start after sitting overnight? -
Comment 1
No steaming from the exhaust or misfire. Sometimes the engine will rev on cold mornings but this isn't consistent at all. Someone suggested a leak in the radiator hose but we had our mechanic look at it and he couldn't find a leak. -
Answer 3
pressure test system to determine source of leak if any then repl rad cap -
Comment 1
Thanks for your reply. We haven't tried a new radiator cap but maybe we should. Pressure check didn't show anything when our mechanic tried this. -