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valleybusman
Top Member

USA
798 Posts

Posted - 11/06/2022 :  5:33:24 PM  Show Profile  Send valleybusman an AOL message  Reply with Quote
I drained the cooling system on my All American with a Cummins . I filled it back up and engine didn't take as much as I drained out .Ran engine and level didn't drop . Ran recirc pump and watched temp bus over heated . I pressured system and thought okay ,Coolant level dropped and thought I was okay Still over heated .Found a plug on the pipe off the thermostat .I didn't see that with all the dust and dirt Removed that and ran engine and coolant level didn't drop and no coolant out of the hole .Tried to pressure system again and no good . So what am I missing ?

g0ttadrift
Advanced Member

USA
258 Posts

Posted - 11/07/2022 :  04:36:27 AM  Show Profile  Reply with Quote
I usually top it off and let the bus run a route. Check it the next day and top it off. It's usually good after that. Thermostat has to open up and that's usually about the amount I need to put in. Only once did I have an air pocket in the driver's heater because of the way it's designed.
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dsalinas1939
Top Member

USA
1316 Posts

Posted - 11/07/2022 :  05:00:17 AM  Show Profile  Reply with Quote
we always use a vacuum filler anytime we drain cooling systems works great never have air pockets
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valleybusman
Top Member

USA
798 Posts

Posted - 11/07/2022 :  06:09:51 AM  Show Profile  Send valleybusman an AOL message  Reply with Quote
How and what is using a vacuum filler? I tried running the bus, but it would overheat and all heaters are cold .
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dsalinas1939
Top Member

USA
1316 Posts

Posted - 11/07/2022 :  12:42:49 PM  Show Profile  Reply with Quote
googlr snap on cooling system refiller part number SVTSRAD262A it pulls a vacuum on the cooling system then pulls in the coolant so u dont get air pockets

Edited by - dsalinas1939 on 11/07/2022 12:44:36 PM
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Bluenozer
Top Member

Canada
640 Posts

Posted - 11/08/2022 :  03:55:50 AM  Show Profile  Reply with Quote
just fill and pin it with the cap off until air is removed , no vacuum puller is needed , when I drain a bus I shut the valves off for the bus so I only drain the engine on a truck I would use pinchers to keep the heater core full

OEM trained in wiring and all engine platforms for over 20 years
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bucksgarage
Active Member

17 Posts

Posted - 11/16/2022 :  08:21:14 AM  Show Profile  Visit bucksgarage's Homepage  Reply with Quote
We use the Airlift (part# 550000) vacuum refiller tool. This takes care of any and all air pockets that the system may encounter.
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