![]() ![]() I'm back to where I started, not knowing what the problem is. Next I'm going to put it all back together without a thermostat and drive it to see how the temperature performs. Your problem may simply be a loose or damaged cap not keeping coolant where it needs to be. RADIATOR CAP Cheap and easy to replace, this is the first thing to check. I'm guessing this is fine because it did remove as much water as I put in. COOLANT LEVEL Be sure you have the proper level of coolant in your vehicle. The only concern I had is that it didn't flow out of the return continously, it would flow, then stop, then flow. I then ran the car while pouring water into the radiator, as expected the water came out of the return hose and into my bucket. I filled the radiator with water and as soon as it reached the top on the cap side it was coming out of the passenger side (where I had disconnected the return hose) so that leads me to conclude that the radiator isn't blocked. So I put the thermostat housing on without the thermostat and set it up based on grossgary's suggestion (see photo, Rube Goldberg would be jealous). I then took out the thermostat and while turning the crank with a wrench I looked up into the water pump and could see that internally the pump and impeller were spinning (not sure that it would spin as well under full load but can't really test for that). I took the cam sprocket cover off and could see that the belt was spinning the water pump pulley. I wanted see if the water pump was spinning properly. The water pump is about 15k miles old and this problem only started yesterday, been running great since I did the headgaskets this past summer.Īny other thoughts on what to try before I rip the water pump out? I was thinking maybe the water pump is not working so I took off the sprocket cover on the right side and checked to make sure that the timing belt is turning the water pump which it is. ![]() Have excellent heat, upper radiator hose gets hot, fans kick in, temperature still goes into the 205-210 range (I don't want it to get any higher so I run the heat full blast and get back to the garage). Put new stat in, bled the system while on ramps. Before putting in the new stat I tested both old and new and both opened in a pot of hot water. I took the thermostat out figuring it was malfunctioning and replaced it with an OEM stat from Subaru. Scangauge is telling me the temp is getting up into the 205-210 range. The lower radiator hose is not getting hot (barely even warm, I'd call it cool). I put coolant in and got it back home with the heater going and the temperature didn't move past mid-point (15 miles). When I got there the upper radiator hose was collapsed, I opened the radiator (no pressure, cool water) and the radiator hose immediately expanded. Car went to overheat yesterday on my son and he immediately pulled over and called me. ![]()
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