Overheating Problems!
Discussion
yet another problem to sort out , its overheating now , it sits at 90c for about a mile from warming up then climbs all the way to 110c and stays there no matter what i do , have changed the stat for the 74 one but that made no diff ,changed the temp sensor and the otter switch and the temp gauge and had the fans running all the time as well, now one would expect the thing to run a bit cooler when on the move as it gets air over the rad but no it stays at about 105/110 all the time and thats with the stat removed as well, so i think that i have either got a blocked rad or a dodgy head gasket , but it dont pump water out at all so i have my doubts about the heads, any ideas before i give up and try a specialist..
its only got one swirl chamber and the cap seems ok and it dont have an expansion tank , i did change the sender unit as well but no joy and its not loseing fluid , i did attach a heat sensor from my multimeter and that registers the fluid as 82c i have checked the accuracy of the multimeter with a boiling kettle and that is showing 98c when the water boils, so i am thinking as you have said an airlock posibly around the temp sensor , is there a special way of bleeding the rover unit, as i dont have a steve heath bible i dont have any info to hand and i just fill the system and bleed it out of the rad bleed screw with the heater set to hot , i do this with the engine off is this right , and is the pressure cap just a normal one from a VW dealer, what psi is it rated at....
having talked to some electricians at work they agree about the gauges being at fault as i have confirmed that the multimeter is reasonably accurate and that the water coming from the stat area is reading 82c whilst the gauge goes happily up to 105/110, it looks as though the wiring is either shorting somwhere or the inline resistor is at fault, we have a test set at work for checking this out and will tell me what resistor i need to get the gauge to read just right so that it matches the meter reading, decca/dacca or degga box somthing like that so i will try that as well as setting the temp sensor in boiling water with the lead on it and a lead to earth and see what the gauge in the car shows, i might add that all the gauges are from a later car with the alloy surrounds and not the black ones as should be fitted this is an early 94 car and a previous owner had thenm all changed dont know why though, and i'm having the rad recored with a new modern core as the rad specailist said the the range rover rad had a very ineficient core fitted as standard....
so it turns out that the rad was more than 50% blocked and has now been recored so that should be ok . but the gauges were replaced by a TVR specialist so you would have thought they should know what they were doing , once i have sorted out the temp gauge i will have to look at the speedo, i gather that it should be about 30mph per 1000rpm as i have the later gearbox fitted, will the oil pressure gauge also be reading wrong as well
got the nice recored rad in it today and it dont go over 90c at all and that was with it sitting in traffic for over an hour but i did have the fans on all the time and once on the move the temp comes right down to 80c so i will be looking at fitting a power temp otter switch to keep things in check and have the fans controling the heat without them being on all the time as it never went above 75c in the evening and a nice new swirl pot cap from the VW dealer, so its running just a little too cool at nite. thats that problem solved now for the clicking exhaust ....
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