Guys, I've red here and there that some people that were trying to find the cause of coolant loss, found out that it was due to air trapped in the cooling system that would cause coolant to be spit out the expansion tank that I like to call the overflow bottle.

I have a very slow coolant leak that I cannot locate. There is absolutely no trace of it in the oil and I'd like to know how to proceed to free the air out of the system if there is any. This is my last step before having it pressure tested.

Thanks.

 

You have it a little backwards. Air becomes trapped in the engine because of a coolant leak.
Take your truck to your mechanic, have them do a coolant pressure test, this will show you where your coolant is leaking from, be it head gaskets or something external.
Do this soon as you can over a Rover engine and loose it in a heart beat.
Mike

 

thanks for clearing that up. Those posts that I can't seem to locate, were saying that air in the system were what they found, and after freeing it, the coolant leak completely stopped????

 

Completely wrong, ask any mechanic, air does not cause the coolant leak, the coolant loss causes air to be trapped in the engine thus causing it to over heat at some point. Trust me on this one, I was a service manager for nearly 30 years, I know what I am talking about. Go get yours tested for a leak soon.

Mike