1989 Chevrolet Other engine overheating

Hello,

Have you check the Fan Clutch?

With vehicle cold and not running spin fan - should spin easily - now start vehicle run till normal operating temp, shut engine off, Carefully spin fan again should be tight or harder to spin. If spins easily like vehicle when Cold replace fan clutch.

No it should just turn easily by hand

Is that with vehicle hot or cold.

If hot then no - When cold should be able to turn by hand easily, as it heats up it begins to tighten up to create more air flow so will be harder to turn by hand.

Ok, you said you checked the Radiator how did you check it?

If you can run your finger along the fins if they disintegrate or break up then would replace radiator.

I believe it around 180 - 195

Even if you have good flow in radiator it the Cooling Fins aren't doing there job it will over heat.

With vehicle cold run your finger down different areas of the fins on the radiator. If they brake up easily or disintegrate then they are not doing there job.

Also, you said you changed the Water Pump did the overheating start after the replacement?

Since it is broken I would replace it. It could be the cause but not sure.

Another thought is that there is an air pocket in the engine causing a hot spot which will cause it to overheat.

The way I usually attempt to get it out is to jack up the front of the vehicle so that the bubble will start to work its way out. Then run it with the cap on loose till gets heats up if has a gauge run till not quite in red, then let cool down refill with water if needed. You will know once bubble is gone, temp will go back to normal. This could take a few hours. It once took me 3 hours to get it out.

OK

OK, did you change the Fan Clutch or the Fan, pics below are the Fan Clutch may not look exactly like the one on there.

OK, do you know what temp thermostat you put in also did you replace the Radiator Cap.