Warm Up

[Cheech]

So, for anyone that has been following any of my posts over the last few months, I finally got my 2.5 put back together and fired it up tonight. Runs Great. But I have a question regarding warm up time, specifically, how long does it usually take untill the top rad hose should get warm? I am just worried about getting an air bubble caught somewhere and destroying all my hard work.

[dasbulliwagen]

Probably 5 minutes or more, at least. The coolant has to get up past 195F to open the thermostat. A better indicator to know if you have air or not is the coolant bypass hoses that go to the intake manifold fittings and the heater core. If those are getting warm quickly, and youre getting heat inside quickly, then you probably don't have an air bubble problem. If the upper rad hose doesnt ever want to get hot, Id look at the thermostat maybe being stuck closed. Good luck, let us know what you find.

[Cheech]

Okay that makes sense. I let it run for approx 5 mins, and the heater hoses did get nice and hot and there was heat inside the cab. I was just concerned because those small heater hoses and the upper rad hose seem to be a little higher than the rad. I also have a digital temp gauge and was using it too. The thermostat housing was getting hot, but it never reached 195 before I turned it off.

[CWLONGSHOT]

Most if not all air is removed if you keep squeezing the upper hose as you fill the system. People make a much bigger case out of the accursed "air bubble" than is really necessary. As long as you fill the system properly, check and refill after a couple short runs.

 

Air accumulates at the highest point. in the 4.0 that's the bottle. The engine is lo in the rear and higher in the front. The upper hose is even higher then the engine. So trapping air or any appreciable amount of air in the back of the block is not really a worry. Squeezing the hose will move it out as you fill. I know yours is a 2.5, these have even less issues with air. More so because they are not as popular as the 4.0. So not as many people out there to create so much miss information about them. :shake: :shake:

 

CW