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Texxxxx
Samba Member
Joined: January 28, 2008
Posts: 448
Location: Monterey, CA
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 Posted: Sat Jun 16, 2018 6:00 pm Post subject: 1.9L Bleeder Valve Question |
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Hello-
I suspect I have an air bubble in my 1.9L cooling system. I have never understood what is supposed to happen when I unscrew the engine bay bleeder junction screw. Radiator bleeder working fine; pressure tank and overflow levels fine and consistent. Just getting the flashing red light occasionally and I am certain coolant level is good and no leaks. I understand it could be the coolant level sensor in the pressure tank, but I just want to know what is supposed to happen when I unscrew that plastic bleeder screw.
Mine just unscrews A LOT and nothing happens when the van is running and up to temperature/pressure; thermostat open, outlet hose hot. I would expect some coolant to come out somewhere when I unscrew it.
I am guessing it is broken and needs to be replaced. Yes? No?
Thanks-Alex
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'85 GL w/2.1L "The Tardis"
It's A Vanagon Day |
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Ahwahnee
Samba Member
Joined: June 05, 2010
Posts: 9798
Location: Mt Lemmon, AZ
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| Posted: Sat Jun 16, 2018 7:16 pm Post subject: Re: 1.9L Bleeder Valve Question |
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Nothing comes out of that bleeder - you just open it to aid the system in bleeding air out.
Sometimes I forget to open it during bleeding - doesn't seem to matter.
If you have just a bit of air in the system it will usually work its way out over a number of heating cycles.
Sometimes a long downhill run during a hot drive will create a condition wherein the light flashes - doesn't seem to matter or last long. |
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Texxxxx
Samba Member
Joined: January 28, 2008
Posts: 448
Location: Monterey, CA
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| Posted: Sun Jun 17, 2018 7:51 am Post subject: Re: 1.9L Bleeder Valve Question |
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| Ahwahnee wrote: |
| Nothing comes out of that bleeder - you just open it to aid the system in bleeding air out. |
Thanks, Ahwahnee. I was expecting it to work like the radiator bleed; pressurized air, then coolant when you opened it.
_________________
'85 GL w/2.1L "The Tardis"
It's A Vanagon Day |
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Mellow Yellow 74
Samba Member
Joined: October 14, 2014
Posts: 1615
Location: Sydney, Australia
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| Posted: Mon Jun 18, 2018 1:03 am Post subject: Re: 1.9L Bleeder Valve Question |
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| Texxxxx wrote: |
| I was expecting it to work like the radiator bleed; pressurized air, then coolant when you opened it. |
Yeah it discharges via the hose back into the system. I replaced this valve because the knob on the old one was broken off. I do use it when I replace the coolant but have no idea if it does anything - it doesn't seem to make any noise or indication of working.
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1962 Karmann Ghia
1974 Deluxe Microbus
1985 Caravelle (Vanagon) |
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