chadzeilenga

So I have the cooling system all back together and I topped it off with a fresh mixture of 50/50 mix with a new thermostat. I started up the engine with the heat on lo and let it warm up. All of the air was purged out. I let it idle and then with a stick I tried to see if the fan clutch was working correctly. I was able to stop the engine fan at idle and also at higher RPM's. Does this mean that the fan clutch is failing? Also, my secondary fan in front of the condenser never comes on. AC is broke, so I can't check it this way. I unplugged the temp sensor at the bottom of the radiator and the fan came on and stayed on until I plugged it back in. My temp gage has always read just a little above 1/2.

Hello mlgs300, This weekend I filled and bled the cooling system. I left the thermostat off because I wanted to make sure that I had full flow into the engine. I topped off the radiator and started the engine, squeezing the upper & lower rad hose to burp any air out and left the heater on LO defrost. Once the coolant started to get warm I shut the engine off and let it cool. Then I topped off the rad and continued this process until I no longer needed to top if off. Then I added to the overflow tank and put the cap on and let the engine idle. The engine was definitely getting hotter than it should, but the temp gage only read 1/2 which I think is the normal operating temp. The fan spins with the engine since it is driven by the pulley. How does this kick on if it is pulley driven? What else could be causing the engine to run really hot, but not register on the temp gage? The rad cap seems to be working well and the thermostat was out of the engine so I would think it would be running cooler than normal. Any thoughts on what else I should investigate? I'm not very familiar with this car yet.

Hello all, I recently bought a 94 GS300 and am having some problems with it running really hot! I've been doing some other work on the car so I really haven't driven it much but it gets really hot when it idles. So far I drained all of the coolant out of the block and filled it up with fresh coolant only to have it do the same thing. So I then drained all of the new coolant out and removed the thermostat and filled the car back up with straight water. I back filled the block until I had water coming out of the radiator and then started the car up and burped the radiator hoses until I couldn't get any bubbles to come out. Checked and there is definitely flow in the coolant from the water pump. The temp gage never gets much past 1/2 way, but the engine is way too hot. When I shut it off it bubbles and gurgles for quite a while until it has cooled off. The upper radiator hose is rock hard and I'm afraid of it bursting. I'm not quite sure what to check next as I thought the problem was a bad thermostat.