[Charlesm42]

I have a few questions for my 2001 Toyota Solara Se V6. It currently has 188,000 miles on it. I was driving one day and the car overheated my wife saw coolant dripping from the area of the reservoir. When I checked the coolant in the reservoir it was full, but it was low in the radiator. I assumed I might have blown the head gasket. I bought a head gasket sealer kit followed the directions drove it home over 120 miles never overheated. And has not overheated since that one time. I am still losing coolant from the car. The reservoir always stays full but the radiator I have to add coolant every so often. It is not overheating at all can run the AC all day long and it never overheats and I cannot find or see any leaks coming from the car. I have checked the oil every single time I have added coolant and no coolant is present in the oil or any other fluids. HELP this is driving me insane what it could be.

 

[Toyota_JP]

I think you may have the same problem/solution I recently replied to here:

99 Solara Boiling Reservoir

Hello, I have a 99 Solara v6 that I'm puzzled with. Recently, I was sitting in a drive-thru, and began to see some white smoke from the passenger side under the hood. I had it diagnosed before as a leaky valve cover gasket, but will only see a little smoke every now and then, so I didn't...

www.toyotanation.com

I think the metal; radiator cap seal deteriorates and allows steam to escape over a long period...maybe since the last time you drained and refilled your radiator. If you loose water from your radiator, it should draw water into the radiator from the reservoir as the engine cools. If the radiator cap seal is bad, you draw air into the radiator instead of drawing water from the reservoir. This is just a theory but I replaced my radiator cap and it's doing fine now.

 

[DFBonnett]

OP,
You really need to pressure test the rad. Had a very small leak last year. Only sign was a very slow coolant loss, no drips. Pressure test immediately revealed that it was the water pump.