![]() You easily might have a slight leak definitely - but that could also be unrelated to your overheat situation. White residue can be early signs of a small leak, (so yeah you probably do have some kind of small leak) but you don't indicate any notable coolant loss at the tank so that can't really be your overheat cause. I also noticed the white specs around the expansion tank, one of the hoses, and part of the fan.When you say 'belly pan' do you mean 'valley pan'? Upon further inspection, I noticed a small coolant leak. Any ideas? I know E39s can be notorious for cooling system issues, but I'm not sure if it's one thing or possibly multiple things. A few hours later, I started it up again in my driveway and let it idle for a while and the temp was fine. The temperature went back down to normal and remained normal for a few miles until I got home. I pulled over, shut the car off for a few minutes, started up again and drove off. Earlier today, it spiked and I got the "coolant temperature" warning, which I never got before. But I've noticed more recently that the temp gauge has started fluctuating it increases gradually toward the red and goes back down again after a minute or so. I have checked it periodically, to always find that there is plenty of coolant in the reservoir and the float is where it should be. ![]() For quite a while, I've been getting the "check coolant level" message. You will get cooolant everywhere so make sure you have two drainpans for pretty much the entire front of the car.So I've been having an intermittent issue with the cooling system in my 540i. Hose clamps are really annoying, these type. The bottom bolts on the waterpump needed an impact to loosen them up. I would expect that the summer will cause the issue to occur again if its going to.Įdit: few other thoughts. The old pump had no sound when you rotated it, but the new one felt a sort of clicking or almost audible tak when rotated. Ran the car up and down the hill 4 times that caused the initial problem and seems all good there. Also put the heat on full, but fan on lowest.Īfter about 20-30 minutes of squeezing hoses, no more air came out and i called it done. The most important thing there was putting the car into maintenance mode, and then revving the engine till you get hot coolant through the left side engine bay radiator hose (facing engine). I used toyota coolant for the refill and used a lisle spill free radiator funnel kit to bleed it. Use your other hand from the water pump side (that is removed) to hold the bolt and centre it. Remove all the coolant hoses to the thermostat, and you can sneak a tiny ratchet behind and get the 10mm bolt out. The second thermostat bolt really confused me as it appears inaccessible. The second hard part was with the thermostat. It comes out at one angle only, and goes in 180% from the way its supposed to be. I had to loosen the oil dipstick tube and pretty much all the electrical connectors to get that sucker out. The whole waterpump procedure is there, EXCEPT for getting it out of the engine bay. Would it set a code for a sticky thermostat? Any other ideas? These new fancy cars set codes for everything. I will try and hydrometer the coolant on the weekend. Are they two separate systems? or would it complain about engine coolant when it meant inverter coolant?Īny help appreciated thanks. Second appears to be intake air temperature. After 30 minutes off i had ECT = 65*c and IAT = 47*cĪssume the first one is engine coolant temp. I have a record from 2016 and 180k km ago, but the records that came with the car are somewhat incomplete, and its brilliant pink, so i doubt its that old. Im not sure when the coolant was last changed. No coolant in the oil so thats good and its sitting near the full mark.Īnyone see this before, or could upload a PDF of the relevant troubleshooting section from the dealers manual? The coolant is bright pink and appears to be in good condition. I have noticed that there is pink evaporated coolant residue on the hose next to the expansion / zero pressure overflow tank at the front. Which is a bit concerning and more critical than a coolant level. However the prius C owners manual says that this warning "indicates that the high engine coolant temperature is too high". I thought, oh the coolant must be a bit low and is sloshing around. This came and went as i said when i was driving up the hill. It took over my screen and had kind of flowing water and a thermometer in red. Hey there, so today i was burning it up a hill with the pedal to the floor after about an hour of stop and go traffic, and i had an intermittent light come up on the dash.
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