For years and years whenever I’ve opened a fox coolant system I’ve always jacked the car up as high as I could in the front and ran the engine until the thermostat opens and dumped 50/50 in while the engine is running about 2500-3000 then put the cap on.
Then today I was thinking about my Grandpa’s old Galaxie 500 that nobody could ever seem to get the air out of the cooling system on. Not even with the jack the land yatch to the moon trick— the wheel base was just so damn long.
Grandpa got mad one morning when it had been overheating the night before and took the temp gauge pickup out while the engine was cold and used a funnel to dump 50/50 in until it wouldn’t take anymore..... problem solved.
Then I started thinking about the Chrysler Sebring I had where the shop procedure was to loosen the plug up on the top of the thermostat housing and run it until coolant comes out the tighten it back up.
with that in mind...... they make thermostat necks for smallblock Fords that are drilled and tapped for a 1/8” NPT thermal sensor designed for electric fans.
So, I think that I along with a few others in the world have been working to entirely too hard in multiple ways.
1) you can dump 50/50 in the gauge pickup bung when the engine is cold and off. This will displace the air which will evacuate the thermostat area immediately.
2) you can loosen the gauge pickup and let the air out with the engine idling then tighten it back down
3) if you have it apart anyway the thermostat neck with thermal sensor bung is only $25 and comes with a NPT plug already installed
Just my thoughts
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