^^^ YUP ^^^

I have always stuck to a religious cooling system maintenance on my vehicles and haven't had one get bad enough to warrant a chemical flush, but if your system isn't performing correctly, then you may want to look into something like that.

Here's a little science behind this. If there is any buildup on the internal passages of any part of the system, it will hinder the cooling system efficiency. This will decrease the heat flux (flow of heat) from the engine to the coolant inside the engine and again from the coolant to the radiator fins in the radiator.

As always, try to flush the system a final time with a bunch of distilled water to ensure that your tap water doesn't contaminate the coolant and shorten its life.

 

I didnt use any cleaner. ill Give it a try. But how do you check the fan?

 

Take a drive for atleast 20 minutes to get everything up to full operating temperature. Stop and turn off the engine. Pop the hood and there should be significant drag on the fan when you try to spin it. If there isn't, then your clutch is shot. When the engine is cold, the fan should be easy to spin.

But this should mean that when you are driving around at highway speed, that your engine temps should be normal, but when you are just driving around town ~30mph or so, that you may have overheating problems.

 

Well I fixed the problem. Since I did a 2 inch body lift on the truck the clutch fan didnt even line up with the radiator. I put in a dual electric setup yesterday. That was fun..... Fixed the overheating problem though.

 

Yeah, that would do it... If the shroud didn't line up properly and/or the front air deflector under the radiator had a gap, then you would be creating positive pressure behind the radiator defeating the efforts of the fan to pull air through it.