Snavy, I found my temperature gauge was higher after using a 50% Ford coolant mix in my AUII, after draining the system and refilling with a 33% mix the high temp readings were gone and it was back to normal, my conclusion is that the more anti freeze/anti boil the hotter the engine will run. I think if the engine runs hotter that will leave less margin for safe engine operation in extremely hot weather, hope this helps
Ford Jeepman is right - More antifreeze and the car will run much hotter and dont believe that the i6 holds 15 litres total otherwise you will stuf the ratios up, I run Valvoline G-05 and mixed it at a higher ratio and the car got alot warmer than it previousl had and that was with old dirty coolant
I did a head change a few weeks ago on my parents car and it ran hotter (100 + on the speedo readout) so i replaced the thermostat although it opened when put in boiling water..... All seem good now
Also have you run the heater to purge the heating system - Also you have to disconnect the top 10mm hose from the thermostat housing to purge air as it it the highest point in the system
Have you driven a Ford....lateley?
Advertising has come along way-----But still not far enough!!!!!
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Hello Snavy, I did 3 cooling system flushes, the first 2 were 50% mix, one was Ford R1-33(Green) the second was Castrol anti freeze anti boil, with both the engine ran hotter and the fans cycled more often than they did before and in mild ambient temperatures. I decided to do one more and I drained the system ( it dumped about 7 litres in the bucket before stopping leaving another 9 litres in the block) I added 7 litres of demineralised water and took it for a drive and the temp gauge was back to its old self and fans did not run their arses off. I ended up completely flushing the system with demineralised water so when I drained it there was no green and then refilled using a 33% mix as recommended by Ford... no problems and I thoroughly "tested" the XR to stress the cooling system! This quote comes from my AUII owner's manual "The initial factory fill is a 33% by volume mixture of glycol-based anti-freeze/anti-corrosion in water. meeting Ford spec WSS-M97B44-A and part number R1-33 which is green in colour" I reckon the factory advice is OK because they do hot weather testing in the NT at Katherine and I know how hot it gets up personally. Check all your hoses as the oldest ones will be your weakest link. If I can save someone else all the time I wasted (not to mention $$$) then it is probably worth it, I hope this helps and you solve your your problem one way or another
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