[P38] Exhaust gases in coolant

MrGorsky · 2025-05-01T19:23:26+0100

Once it’s warmed up and the thermostat is opened, I rev it with the cap on. If you rev it hard with the cap off you’ll get coolant everywhere. I find it shoves any air out that way. A few blips of the throttle should force coolant through all the pipework. You don’t need to go mad.

kermit_rr · 2025-05-01T19:24:50+0100

Water boils around 100c at sea level.
With a 14psi cap that increases to around 120c. If it's 50/50 antifreeze then it rises further to around 130c. If i recall

kermit_rr · 2025-05-01T19:40:53+0100

The pressure and also the running temp depends greatly on the level being correct in the expansion tank. It will run a few degrees warmer if it's even a bit low

blue_cheese · 2025-05-01T19:48:59+0100

I believe I followed the RAVE method:

- Drained as much as I could via rad plug
- Slowly filled expansion tank with a hose on a small stream
- Started engine, monitored level, waited for thermo to open
- Stopped engine, waited for it to cool, topped up expansion tank again.

I believe that's how it's done it RAVE? Maybe without the garden hose.

Oh and I also blew through the return pipe to clear it

kermit_rr · 2025-05-01T19:51:56+0100

You said the cabin heater return was cold. Can you bypass it in case it is blocked?

blue_cheese · 2025-05-01T20:21:08+0100

Would it be unwise to put the hose directly in to the cabin heater pipe and give it a good blast?

kermit_rr · 2025-05-01T20:31:04+0100

A reverse flush may help? You don't want to kill it though

[P38] Exhaust gases in coolant

MrGorsky

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kermit_rr

Very

kermit_rr

Very

blue_cheese

Active Member

kermit_rr

Very

blue_cheese

Active Member

kermit_rr

Very

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