Rebuilt 351c, getting close to the initial fire up. I've seen some how to's on purging air from the system with the engine on, but nothing on how to do it with the engine off. Any tips or tricks?
trips left
it's done when running- otherwise the thermostat won't open to allow the air to pass through and out.
Top tip, drill a 1/8" hole in thermostat perimeter to aid in circulating trapped air.. hopefully yours is not fitted yet, but, a quick and worthwhile job nonetheless..
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What I do when filling up the engine with coolant/water is:
Assuming engine cold:
(1) Turn the heater to "on" so that coolant will fill/circulate through the heater core
(2) Take out the temp sending unit from the manifold. Fill up with coolant until it's about to come out of the temp sending unit hole. Replace the temp sending unit.
(3) Fill with coolant the rest of the way until it just covers the radiator fins
(4) Start the engine and let it start to warm to operating temp
(5) Add coolant as needed. When the thermostat opens the level usually drops (having a IR temp gun to check the temp of the radiator hose is useful in gauging just when this is occurring)
(6) When you don't see any more bubbles in coolant in the radiator, you're done. Radiator cap on. Engine off.
(7) Later, after the car has cooled down, check the level. Coolant should just cover the radiator fins. Not any higher.
+1 on putting a small "breather" hole in the thermostat. Helps "burp" the system. Some thermostats already have them.
Assuming engine cold:
(1) Turn the heater to "on" so that coolant will fill/circulate through the heater core
(2) Take out the temp sending unit from the manifold. Fill up with coolant until it's about to come out of the temp sending unit hole. Replace the temp sending unit.
(3) Fill with coolant the rest of the way until it just covers the radiator fins
(4) Start the engine and let it start to warm to operating temp
(5) Add coolant as needed. When the thermostat opens the level usually drops (having a IR temp gun to check the temp of the radiator hose is useful in gauging just when this is occurring)
(6) When you don't see any more bubbles in coolant in the radiator, you're done. Radiator cap on. Engine off.
(7) Later, after the car has cooled down, check the level. Coolant should just cover the radiator fins. Not any higher.
+1 on putting a small "breather" hole in the thermostat. Helps "burp" the system. Some thermostats already have them.
Radiator cap should be at the highest point, car pointed slightly uphill to help get air out of the heater core helps.
What I've always done is to remove the heater hose (where it plugs into intake manifold) and fill SLOWELY until I get water up to the fitting. Then when it's there plug the hose back in. If you do not have a spring in the lower radiator hose you can hand pump that to try to get the air "up". Just what I do. Mel
we are the original family owners of my 351C
In all these years and all the coolant changes I never had any issues with this motor trapping air
if you want to take the extra step, as mentioned b4 removing the stat or sender b4 filling is a good idea
but imo not necessary
In all these years and all the coolant changes I never had any issues with this motor trapping air
if you want to take the extra step, as mentioned b4 removing the stat or sender b4 filling is a good idea
but imo not necessary
Park car on a relatively steep hill or on ramps with the nose facing up-hill.
Remove the radiator cap.
Start and run the engine until the thermostat opens and coolant begins to circulate.
Add coolant as needed and wait for thermostat to open again.
When finished, replace radiator cap and turn off engine.
When cold, check coolant level.
Remove the radiator cap.
Start and run the engine until the thermostat opens and coolant begins to circulate.
Add coolant as needed and wait for thermostat to open again.
When finished, replace radiator cap and turn off engine.
When cold, check coolant level.
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