Toyota MR2 Message Board - View Single Post - overheating --i need fresh ideas not the same old stuff

mr2tim · 09-19-2009, 11:24 AM

Hi Gina,

You want a fresh idea? Here goes.

I've had this problem before, as I've owned and competeted for 20+ years.

You may have a tiny hose/componet leak which, apparently from your given timetable, takes many days to realize.
(My last one was my NA street car which had a pinhole leak at the water fill pipe where it meets the entry to the cylinder head-was that ever hard to locate!!)

What happens is that the problem area leaks very, very slowly and to compound the problem it does so only when the the system is hot and thus pressurizing the cooling system. Your coolant apparently drips onto HOT parts of the car and evaporates, bingo, no trace?

Look for areas underneath clamps, where cooling componenets touch other items in the engine compartment, undercar coolant tubing and radiator. There's about 25 ft of coolant tubing to and from the radiator so there's LOTS of places to look.
Yes. most is under the car, sorry!

I'm not discounting the other other comments given here, they may be valid.

mr2tim
Supercharzed Toyz Raczing
A Toyota Race Team since 1989

PS Your a girl you can dig this?
My wife blows talcumm powder into inaccessible areas and if it gets wet that's the leak.
(she's a great pit crew chief)

09-19-2009, 11:24 AM	#5 (permalink)
mr2tim SUPERcharZed ToyZ RacZer Join Date: Mar 2008 Location: South Florida Posts: 1,789 Thanks: 8 Thanked 118 Times in 111 Posts My Google Map iTrader Rating: (6/100% )	The unsee-able leak? Hi Gina, You want a fresh idea? Here goes. I've had this problem before, as I've owned and competeted for 20+ years. You may have a tiny hose/componet leak which, apparently from your given timetable, takes many days to realize. (My last one was my NA street car which had a pinhole leak at the water fill pipe where it meets the entry to the cylinder head-was that ever hard to locate!!) What happens is that the problem area leaks very, very slowly and to compound the problem it does so only when the the system is hot and thus pressurizing the cooling system. Your coolant apparently drips onto HOT parts of the car and evaporates, bingo, no trace? Look for areas underneath clamps, where cooling componenets touch other items in the engine compartment, undercar coolant tubing and radiator. There's about 25 ft of coolant tubing to and from the radiator so there's LOTS of places to look. Yes. most is under the car, sorry! I'm not discounting the other other comments given here, they may be valid. mr2tim Supercharzed Toyz Raczing A Toyota Race Team since 1989 PS Your a girl you can dig this? My wife blows talcumm powder into inaccessible areas and if it gets wet that's the leak. (she's a great pit crew chief)