Question about Volvo C70

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Volvo C70. Water loss reappeared when bottle cap removed. New rad, cap, stat, head gasket, head skimmed; after all that, still overheats & losing water. Out of ideas; matrix? head failed again?

Engine smells like hot watery metal. Temp gauge appears fine. No mayonnaise to oil cap or water bottle. Otherwise you'd never know anything was wrong; runs ok, no smoke or steam from exhaust. 150k miles but well serviced and maintained. Otherwise lovely car but heading for the scrappy this weekend. Amanda.

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Replace your water pump.

Posted on Apr 05, 2017

Testimonial: "Cheers for the answer... this was done recently with cam belt but wonder if it's weak? Seems ok if you keep moving but the minute traffic slows the coolant light comes on."

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Running at normal temp per the temp gauge, so why does it lose hot water via the tank cap when stopped?


A bad Head gasket will cause pressure in the reservoir.
Not sure if the C70 was known for Head Gasket issues. Ask Here
www.BRICKBOARD dot Com

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On my Suzuki gran vitara 2002 I am losing engine coolant from overflow pipe,,overheats after 20 mins of driving(once coolant tank empty),,recently had a new thermostat fitted...please help,,thankyou


you might have a blown head gasket, when the engine is cold remove the rad cap start the engine and look for air bubbling into the rad , if you see said bubbles then you need to have the head gasket replaced. PS Do not remove the rad cap when the engine is hot as you could be seriously injured/burnt

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Hi, My 95 2.8 Pajero (turbo deisel) has been overheating. I have replaced the thermostat, water pump and the rad cap (rad replaced 2 years ago) and still it is boiling over into the expansion bottle. When...


Just a guess but I think their diagnosis was that the head and head gasket was not leaking and not a source of the bubbles you spoke of.
Usually when the head or head gasket is leaking, a unusual amount of water will will be expelled from the tail pipe.

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1 Answer

Expansion bottle filling with oil


Water ways and oil ways are never in contact with each other in normal circumstances. The usual reason for your problem is that the cylinder head gasket has failed allowing a gap in the gasket to allow water and oil to come into contact with each other. I imagine there is a high probability that there is also water in the oil (Take the oil filler cap off, you will probably find white/grey emulsified oil in the top of the cap).

Sorry to say this is pretty bad news, you probably find that the vehicle is losing power too, as one or more of the cylinders will be compromised (Symptom: Engine "Missing" misfiring on one or more cylinders). Other classic signs are excessive white smoke from the exhaust as a consequence of water and or oil getting into the combustion chambers.

This will almost certainly be the case, requiring the cylinder head to be removed and the gasket replaced. It's likely that this is the result of an overheat of the engine at some stage. If you have an aluminium head, there is also a high probablinty that the head may have warped and it may need skimming before it is re-fitted

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My trooper is overheating only when im doing 70mph for about 7 miles it never does it at lower speed ive flushed system changed stat changed rad cap it does,nt lose water head gasket fine


check belt tension on waterpump, make sure radiator and overfill bottle are full to specified level. either the coolant is low or the pump is slipping

Apr 03, 2011 | 1995 Isuzu Trooper

1 Answer

2001 Olds Alero suddenly quits sending heat then sometimes it does and sometimes it overheats. Is this a water pump or a thermostat. Help. Mallory M


Check the cooolant level, sound like theres a leak somewhere, water pump, hoses, t-stat bad, rad cracked, heater core leaking, bad rad cap, cooling fans not working, you need to get it looked at really soon, before you get it to hot and blow a head gasket.

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My Toyota Hiace high roof with 3L Diesel Engine heats up. This was after the cylinder head was skimmed and had new valves replaced. Please help me. How can I stop this heating up? Cannon


Your thermostat may be staying closed, if the top coolant hose becomes hot after the engine running for a while, then thermostat is opening ok. Next check to see if the bottom hose going to the rad is getting warm. If its staying cold then you may have a problem with the water pump not circulating the water around the cooling system. If thats ok check the rad cap is sealing ok. when the engine gets up to normal engine temperture remove the reservoir top filling cap which has a rubber pipe going to the thermostat housing. with the engine running there should be no water coming down the pipe and exiting the filler cap. If there is it could be the rad cap not holding pressure which it would need to be replaced or the head gasket is leaking and pressurising the coolant system.. hope this helps you..

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head gasket, if a crean collor is on the oil cap, lools like water pump etc are good

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Audi A4 2.5 V6 TDI - Creamy grey coolant in expansion tank


Sounds like blown head gasket (or worse) still to me.
Remove oil filler cap and look for grey oil.
Never use water these days but special coolant. Water makes vapour spots and cause block cracks, worse then blown gaskets!!!
vapour does not cool very well.
Look like you have cracks already.
Take a compression test if possible. But might not show op at that temperature.
The gauge indication troubles me.

Apr 14, 2009 | 1998 Audi A4

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