Burn2 wrote:As the flow is really low when thermostat is open, that should erase clogged radiator no?
The limit of the radiator would be a possibility if:
1) the problem was there at the beginning ==> but that was not the case. It happen there is 6/7 year, i never had any overheating problem on this road before.
2) the problem disappear when you drive lower on the hill ==> or in my case, it's the opposite, if i drive in low speed the problem is most important on this hill.
Normally i drive this road at 110km/h in 6. You are not at full speed, and i could pass this road with no problem. Now i could only pass it if temp is < to 25° and after 25° i will be really near overheating all the time. (CHT near 120)
If i low speed to 80km/h in 5 or 90 to be higher in RPM and to have less load, i will overheat more!!! The only way to pass when it's more then 28° is... To be full throttle on the accelerator expecting that it will pass... It's the only way i could pass this long hill now.
I think that when there is less fuel, it heat more on the cylinder, that's why we think more of a water pump that does not flow a lot, if that was a radiator partially clogged, i should pass when i slow down, or i should have problem in other time (like in slow-down traffic etc) but that's never the case.
I still think your CHT sensor may be an issue, I have a 2.4 140 remapped to 170ps and it's never been an issue in the 40C+ temps I see here in Australia in the summer, the temp guage has never been higher than 90C under any circumstances. I replaced my water pump several years ago due to a leaking pump shaft seal but it never overheated.
Lord Knobrot