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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Coolant flowing through overflow hoseViews : 806 Replies : 3Users Viewing This Thread : |
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Jul 21st, 2011, 15:19 | #1 |
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Last Online: Oct 19th, 2011 17:17
Join Date: Jan 2007
Location: Hatfield, Herts
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Coolant flowing through overflow hose
Hi,
I have a V70 1999 T5. I've just noticed that coolant is being pumped through the small-bore overflow pipe from the top of the radiator back into the expansion tank when the engine is hot and revved above an idle. I'm assuming that this is caused by pressure from the water pump when the revs are raised forcing coolant through the thermostat towards the radiator, and some of the coolant is taking the route up the expansion hose back to the bottle rather than all going through the radiator. Could anyone confirm if this normal behaviour or not?? Now I'm worried that there's a problem brewing. The top hose does feel very hard when up to temperature - I'm wondering if this is a symptom of a) head gasket failure pressurising the cooling system, or b) blocked radiator The engine temp is normal (steady at half-way). Thermostat has been replaced in the last few years. Did have a weep in the rad a while back that I fixed with RadWeld (I know..!) Any thoughts greatly appreciated. Can anyone recommend a DIY pressure tester for the cooling system that could confirm/disprove that it is being pressurised by a HG failure. Thanks.
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Paul '99 V70 Classic T5 SE Auto Last edited by pt5on; Jul 21st, 2011 at 15:39. |
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