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Grandvista 250 / Overheating
« on: October 11, 2015, 03:25:32 AM »
My 2006 GV250 with 28K miles is overheating.
What I am finding is that I am loosing coolant.
All is well until about 40 minutes and 25 or so miles.
What I am finding is that the coolant reservoir tank (the plastic one accessible from the front cover), is over filling and coolant is being dumped out via the overflow tube. When I start out I have it filled to the mid point as viewed through the gap in the dash area when I end the ride overheating, the reservoir tank is full.
I have been trying to fix this for a bit of time now and can' make any sense of it.
I have checked hoses and replaced hose clamps making sure there are no leaks.
I tested the radiator caps pressure and it is good. Couldn't test the systems pressure as the testers cap wouldn't fully lock on.
Tested the thermostat and it is good. The thermo switch seemed questionable (fan worked sometimes, but when really hot it wouldn't come on.) It also measured as a closed switch when fan was on but other times wouldn't close when engine was into four and 5 segments on the dash. I took it out and measured it in boiling water and it measured in the meg ohms. I ended up bypassing it with a switch and run the fan manually.
Also, I can let the machine run at idle for an hour and and it doesn't overheat (that was when I knew the fan sensor was working properly.)
Any help/ideas?
What I am finding is that I am loosing coolant.
All is well until about 40 minutes and 25 or so miles.
What I am finding is that the coolant reservoir tank (the plastic one accessible from the front cover), is over filling and coolant is being dumped out via the overflow tube. When I start out I have it filled to the mid point as viewed through the gap in the dash area when I end the ride overheating, the reservoir tank is full.
I have been trying to fix this for a bit of time now and can' make any sense of it.
I have checked hoses and replaced hose clamps making sure there are no leaks.
I tested the radiator caps pressure and it is good. Couldn't test the systems pressure as the testers cap wouldn't fully lock on.
Tested the thermostat and it is good. The thermo switch seemed questionable (fan worked sometimes, but when really hot it wouldn't come on.) It also measured as a closed switch when fan was on but other times wouldn't close when engine was into four and 5 segments on the dash. I took it out and measured it in boiling water and it measured in the meg ohms. I ended up bypassing it with a switch and run the fan manually.
Also, I can let the machine run at idle for an hour and and it doesn't overheat (that was when I knew the fan sensor was working properly.)
Any help/ideas?