Car getting real hot....

yellow rose said
That’s exactly what I said many posts back. You just contradicted yourself BTW.

I said there was about a 20 degree difference (I could have said Delta T but everyone and their mother got what I was saying) between the coolant temp coming out of the block and at the engine block going back in.

Now that you agree with what I said, how does leaving the coolant in the block longer do anything? It doesn’t. You still get about a 20 degree reduction to coolant temp IF your system, the ambient temp and pump speed is high enough to do it. If it’s not then you get a big temp increase from thermostat opening point to coolant temp while operating.

The longer the coolant stays in the engine the hotter it gets. If it comes out hotter it’s going to go back in hotter.

As for cavitation, I hear all about it and I’ve never seen it. Not once. Evidently Chrysler didn’t see it either because they damn sure started turning the pumps faster by at least 1973.

It’s time to kill this stupid myth. And all of this discussion has little bearing on the OP. His shroud is garbage. That’s the first thing to fix. After that work can be started on fixing anything else that could be wrong.

As I stated ,"after researching more" I have changed my mind. I have seen evidence of pump cavitation. Generally I believe that to be a result of poor maintenance. Twice were on cheapskate farm trucks brought in when they could not figure out the problem. Four were on hiway haulers that also had not had the coolant changed in a long time. Eventually the aditives break down and the coolant does not have the neucleate suppression any more. This also pertains to cavitation. Cummins especially were prone to liner erosion on the major thrust side and to a lesser degree on the minor thrust side. When those bubbles collapse the oolant slaps the liner hard and eventually erodes pits. Water pump impellers the same. I did pull wrenches as a proffession for 25+ years. Then I got into instrumentsation for about 15. You can get cavitation on process valve trims as they com off their seat or even more so just as they close.
Then there was sand erosion on the trims for underground gas storage. They drill into tight porous geology. With no presure downhole when they drill sand and stones get left down there. They purchase gas when the price drops a bit and sell it when it goes up. They can store and sell 6 to 8 times a year. For the first year or two, when they open the valves to sell the gas, it brings the sand up each time and sand blasts the trim. $ 10,000 for 6" trim for each valve. Eventually the sand is all gone.