Re: Running very hot

Posted by Jim Kavanagh On 2018/9/16 17:06:42

Yes, new coolant added at about 50/50 - I think it might have been just a little light because I bought 2 gallons of coolant + added some left over in a container. Capacity is just under 20 Qts, so I might be just a little under 50/50, but would be quite close.

One thing I noted this morning. I parked the car a few days ago after running it to temperature. I have a 7Lb cap on the radiator. After running, the system was pressurized, but not enough to cause the overflow to leak. But the top and bottom hoses were definately hard from being pressurized. This morning, the system (at cold) was still under pressure, maybe not as much, but the hoses were still hard and I had to release the cap slowly to bleed out the pressure.

I am having a hard time figuring this out. At temperature the coolant/water solution expends and builds up pressure in the system. When it cools, it should contract back down. I am not sure why there would still be significant pressure in the system when the water certainly got down to 60 or below in the last few nights.

In the past, after cooling down, my top radiator hose would be noticeably concave at the top. I replaced both top and bottom hoses, they are clearly not contracting during operation as both get quite hard from the internal pressure. But why would they remain presurized after the water cools back down.

I am pretty certain no water is leaving the system based on the level in the radiator.