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Re: 89 C 3500 7.4l TBI with issues
Gm dash gauges are not quality instruments.
I would look at the ECM data to see what temp it shows.
You could also look at the temp with a infrared thermometer right by the thermostat housing.
You should test the fuel pressure while it is being driven. The fuel pressure regulator and the connection hose in the tank are common causes of low pressure other then the pump.
If the electric fan is not making a difference, I would not worry about how many blades there are on the fan right now.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
Last edited by ChevyTech; 02-16-2018 at 11:07 AM.
Reason: Add more
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