Hello,
my /6 225 c.i. Supersix Dodge 3700 GT used to overheat a lot. I cleaned with radiator flush the system (2 cycles). A lot of dirt went out. It overheat less but the problem went on there. Then I cleaned the radiator (with special wires). It was partially clogged. The radiator workshop adviced to throw it away but as it´s part of a classic car they did the job more carefully to avoid breaking some of the inner ducts. Then, the car overheat less. It had a problem with the crankshaft so we took the engine out and cleaned the inner ducts in the head. More dirt had to be taken out. Then the overheatting problem was solved.
The problem was that the man who sold me the car (using it for 20 years) used to fill the system with water
, a water with lots of lime and other nasty stuff (rusting the cooling system), as the car was progressively overheatting and puking coolant, so he had always cans of water in the trunk to refill the system (very cheap in the short term but incredibly expensive in the long term).As my car has automatic transmission and A/C when I switched on A/C the temperature raised considerably. In Spain Dodges with and without A/C had the same radiator, and it hardly does its work with no A/C units. In addition, the automatic version radiator has to cool the hydraulic fluid from the transmission, so one friend did a trick that worked very well: With some washers got the fan some milimeters closer to the radiator. The air flow is now much powerful and cooling has improved a lot.
In addition, we mounted an electric fan between the grill and the radiator. It turns on with the A/C system and also when temperature indicator goes higher than usual (92-95º Centigrade). This was a common solution in the last times when the Dodge 3700 GT was still an everyday car.
Now my Dodge could do the Paris-Dakar race with no overheatting problem
