"Burping" a closed system

I'm having my cooling system flushed in my 89 XJ by my mechanic. I asked him about "burping" the system to avoid air bubbles.

He mentioned removing something from the rear of the head, I believe, to force the air out of the system.

Does this sound right?

I think I remember reading about jacking up a certain corner of the Jeep to help to raise the bubbles to the top.

Anyone know anything about this?

Thanks in advance...

Chris

Yes, the coolant temp sensor, rear of the head on the driver's side. 9/16 deep socket.

pulling that sensor can be a pain, i have one of these t's installed in one of my heater hose (couldnt tell you which right about now though) , seems to work.


now that i think of it, that sensor might be easier to do without scalding yourself

Hello All,
For those of you, that do have the T-fitting in one of the heating hoses, replace the plastic screw on cap with a brass one (same as a garden hose end cap).
I had the plastic cap for a few seasons and just buy chance, I looked at it one fall day, and to my astonishment, the top of the cap was so thin, failure was imminent. I posted this a few years ago. I hope this helps someone.

62tmar

62tmar said:

Hello All,
For those of you, that do have the T-fitting in one of the heating hoses, replace the plastic screw on cap with a brass one (same as a garden hose end cap).
I had the plastic cap for a few seasons and just buy chance, I looked at it one fall day, and to my astonishment, the top of the cap was so thin, failure was imminent. I posted this a few years ago. I hope this helps someone.

62tmar

Click to expand...

The cap failing on those Prestone Ts is so common it is not IF but WHEN. I stopped using them a couple decades ago.

joe_peters said:

The cap failing on those Prestone Ts is so common it is not IF but WHEN. I stopped using them a couple decades ago.

Click to expand...

I went the next step - and made the whole T fitting out of brass plumbing odds & sods. 3/8" pipe nipples fit neatly into 5/8" hose.