Coolant flow direction

[Paul Bennett]

Does water flow from the upper radiator tank into the engine OR is water pumped from the lower radiator tank through the block?


I will need a thermostatic switch to energize an electric puller fan. Recommendation was placing it at the radiator drain petcock but I'm unclear about the plumbing soas the switch has access to max temperature. Methinks adding another separate female fitting for the thermal switch on the radiator tank would be best.

[Kurt in NJ]

It could depend on why you are going electric fan, usually you switch fan on based on need, the return cooled coolant is getting hot(lower tank temperature), if you are trying to use electric fan to make up for other problems with the engine/cooling system perhaps you want the fan to come on earlier/run most of the time, then the sensor in the top hose or top tank of radiator

[40cpe]

Cooled water is taken into the engine from the bottom of the radiator. If you want to control the fan by engine temperature the switch would need to be exposed to the water expelled from the engine at the top. There are differing thoughts as to which the best place to install the switch.

[philipswanson]

Originally Posted by Paul Bennett

Does water flow from the upper radiator tank into the engine OR is water pumped from the lower radiator tank through the block? .

Both.

[34PKUP]

Suspect that you won't need a thermal switch as it will probably be running all the time anyway.

[Ole Don]

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It's best IMHO to use pipe plugs in the heads.