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A Quick question..

How much coolant can I expect to leak into the car when I change the o-rings?

Ta

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As long as you've taken the coolant reservoir cap off so there's no pressure in the system, not a lot. I use one of the small takeaway plastic trays to catch what comes out.

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I used a black bin liner, cut open, and that will push under the heater box and out the door.
Not sure if it was necessary but I drained the rad into a clean bucket for reuse and got just drips from the heater matrix. Diesels don't have the potential for cooling system air locks though so I was happy to drain it down.

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That is good news on both counts, as I have a dirty diesel.

Lubricate the o-rings? I seem to recall being told Vaseline eats rubber?

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RAVE says to lubricate with neat antifreeze.

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Gilbertd wrote:

RAVE says to lubricate with neat antifreeze.
👍

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Being non the wiser when I did mine, I used spit. I also used genuine O rings as I was hoping not to revisit again! As it happened, I did have to revisit it again some months later but it was just the screw had worked loose, been fine for around 2 yrs now.