Coolant bleed procedure?
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Coolant bleed procedure?
Is there a special procedure to bleed the air out of the cooling system if you change a heater hose on the new 7.3L gas engine? Thanks!
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2021 Winnebago Vista 35U with the new Ford V-8 engine in the F-53 chassis
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2021 Winnebago Vista 35U with the new Ford V-8 engine in the F-53 chassis
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
Is there a special procedure to bleed the air out of the cooling system if you change a heater hose on the new 7.3L gas engine? Thanks!
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2021 Winnebago Vista 35U with the new Ford V-8 engine in the F-53 chassis
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2021 Winnebago Vista 35U with the new Ford V-8 engine in the F-53 chassis
Fleet Mechanic
Joined: Jul 2008
Posts: 1,937
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From: Southern Crescent
I agree with the others there is no special procedure. It sort of does it own it's own.
As air expands more rapidly than liquid when heated, running the engine to temperature will force the hot air/steam mix out of the system and into the reservoir.. When shut off and cooling down, contraction will suck coolant out of the reservoir. A few cycles of this and you're done. Just keep an eye on the reservoir.
As air expands more rapidly than liquid when heated, running the engine to temperature will force the hot air/steam mix out of the system and into the reservoir.. When shut off and cooling down, contraction will suck coolant out of the reservoir. A few cycles of this and you're done. Just keep an eye on the reservoir.
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We had a GM 3.4 that had a bleed valve near the t-stat. Not every system has those and if it doesn't, the thinking is probably that the system will purge itself of air as described above.
Once it goes through a couple warm up-cool down cycles, check the levels.
Once it goes through a couple warm up-cool down cycles, check the levels.
Fleet Mechanic
Joined: Jul 2008
Posts: 1,937
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From: Southern Crescent
German Engineering!
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