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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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D5 163 Chucking coolant outViews : 601 Replies : 9Users Viewing This Thread : |
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Nov 18th, 2020, 12:13 | #1 |
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D5 163 Chucking coolant out
Hi all,
I've got a problem with my 163 D5 in an XC70 that I have been trying to investigate today. The car has been losing coolant rapidly and the low coolant warning has been coming on. This happens rapidly - certainly within 30 miles (my commuting distance) when the coolant has been at Max before setting off. Things I have observed today...
The main issue that I have, is when the car is up to temperature, and then put under load the coolant level rises to the top of the tank and will begin to flow out through the coolant cap. Once the revs drop, so does the level and gets a bit lower each time eventually resulting in the low coolant warning illuminating. Could this be as simple as a faulty pressure cap? I can't see anything pointing to head gasket, but I can't also see any obvious reasons why the level would rise so much (from the max mark to overflowing) when revved. Any ideas? |
Nov 18th, 2020, 14:23 | #2 | |
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Nov 18th, 2020, 16:46 | #3 |
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I can't see it to be honest... No oil and water mixing, no fumes smell in the coolant, no power loss, starts easily, no smoke or steam...
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Nov 18th, 2020, 17:55 | #4 |
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Flip the seal inside the expansion tank cap and and see if that helps.
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Nov 21st, 2020, 09:02 | #5 |
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Nov 22nd, 2020, 13:35 | #6 |
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Okay, I've had some time to look at this today. I'm still a bit baffled.
I've replaced the coolant cap with a brand new one - this has made a significant difference. Before when removing the coolant cap, there was never pressure in the system. There is now! Took the car out for a run, and 8 miles in I got the low coolant warning again. I stopped, undid the cap and the coolant rose slightly, topped it back up, ran the engine at fast idle until the level settled, cap on and off we went. I haven't had the low coolant warning since this. Once back home on the drive & idling, the coolant level would suddenly begin to lower and take around 20 seconds to go from max to min. I topped up again and it hasn't dropped since then - perhaps a significant airlock that I've finally shifted? One concerning thing is there is a 'stream' of something, whether it's small bubbles or I can just see coolant flowing, from the hose at the bottom of the expansion tank (power steering reservoir moved out of the way). It seem to rise up to the top of the tank - this concerns me as Google tells me that's head gasket... |
Nov 22nd, 2020, 13:43 | #7 |
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Nov 22nd, 2020, 13:44 | #8 | |
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Nov 22nd, 2020, 13:46 | #9 | |
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Nov 22nd, 2020, 19:44 | #10 |
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Sniffer test to confirm, you can get the for about a fiver.
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