Weird cooling system behaviour

DQ81 said

Where exactly? I assume you close the hole but how? (otherwise once the air is gone the coolant wil escape)


My rad is shot, the coolant is brown and there was NO thermostat.

Going to flush the system and hope no passages are blocked.

Replace radiator (have new one) do a seperate oil cooler for trans, new Tstat 180* and new rad cap. Hope that does the trick.

Why would the PO have ran without a Tstat you think? It was going to be a drag engine build that never got off the ground is all I know...

Click to expand...

Hold the thermostat up like you are looking at a UFO and you will see the flat flange. The hole should be drilled between where the gasket seats and the main thermostat spring/bulb. You can take the thermostat housing and set the new thermostat down inside it and you will see where you need to drill the hole. Some thermostats come already come with a check valve so no hole needs to be drilled. I got a new thermo for my 03 Dodge Ram and it already had the small check valve.

Some people think that without a thermo that the motor will run cooler but that is not the case at all.