im trying to close off the coolant passages that are running from the engine to the firewall and i want to know how to do this. are there plugs i can buy to put on the engine? im trying to take the heater and all that stuff out of the car since im trying to lose some body fat. please help me out. im trying to find the alternative to welding the holes shut...

 

Just stick in a bent U-pipe with right diameter in-place of heater, thats all.