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I have discovered that toyota didn't design the cooling system very well on the 7MGTE. On the supra, the radiator is mounted blow the motor, on a pickup, the radiator is mounted above. Not too big of a problem if it is just slightly above, you still get proper cooling. What I have found out, is that you cannot do a bed mounted radiator without the aid of an electric water pump. The pressure required to pump water that far and that high is not enough.

The water has two paths it can take. Through the block, and when the thermostat opens, it can(doesn't have to) flow to the radiator. Guess I either have to put my rad up fron, or get an inline electric water pump.
 
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