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I’m having overheating trouble with my 74 V4 96. I suspect the thermostat is the problem. When I replaced all the hoses and installed a used radiator, I also replace the 180 F thermostat with the one that Pep Boys booked for the car. The result was the same as when I started. That is, as the highway speed increased, so did the temperature. Slowing down would drop the temp.
I gutted the new thermostat to create a restrictor plate, filled with water and flush, and drove the car. With the restrictor plate, the highest I could get the temperature was about half way up to the N.
I rinsed, put in a NAPA 137 thermostat, and added 50/50 coolant/water. It was better, but will still overheat if pushed up to normal highway speeds. In addition, it is very slow to get up to normal operating temperatures.
Because I could got even get the temperature up to normal with the restrictor plate, I am pretty sure that the basic cooling system is up to the task.
I can only think of two reasons for the problem. One is that I have not bled the system enough, but I have tried several times. The other is that the NAPA 137 does not work well in this application. Neither the Pep Boys nor the NAPA thermostat look like the original. The original is somewhat cup or can shaped rather than just a flat disc.
Could the difference in thermostat construction be affecting the flow?
Alternatively, do I need to put a hose on the bleeder valve and let it bleed several gallons back into the radiator?
Other suggestions?
Cheap Charley
posted by 64.12.116...
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