1. Home
  2. Volvo automobiles
  3. V70 "disappearing water"

V70 "disappearing water"

2000 V70 2.5l fwd turbo

found i had a small leak in the reservoir for coolant- it was coming from a hairline crack in the bottom of the tank near the hose connect. replaced it with a new volvo unit and a new coolant level sensor (the old one quit working) now i am still losing about a pint or so of coolant a week. sometimes the reservoir will be below the minimum line, and sometimes when i release the pressure from it, it will fill back up to near maximum. it's almost like i have air bubbles in the cooling system somewhere. i know people are thinking head gasket, but there is no oil in the water, no water in the oil - so if it is a head gasket then the exhaust gases are getting into the water jacket somehow, but also causing no symptoms whatsoever. car runs starts fine, has good power, has normal exhaust- not white, not excess water vapor... my question- is there a hose/spot where water could leak slowly and be vaporized by engine heat and not be noticeable upon inspection?? i have not found any further signs of leakage...

Reply to
Robbie Wilson
Loading thread data ...
Reply to
~^ beancounter ~^

Handy trick for this is get an old coolant tank cap, drill a hole and install a tire valve stem, and then use a hand pump to pressurize the cooling system to 1-2 psi with the engine cold and look for leaks. Small leaks will usually only leak steam when the engine is hot, but when you pressurize it cold, they drip liquid. Don't get carried away with the pressure or you will create a leak where there wasn't one.

Reply to
James Sweet

On a different make of car I had a head gasket go with a pin-hole leak between a cylinder and a water passage, it was using about a pint every couple of days or 100 miles, the only symptoms were water loss and the water taking on a dirty grey colour with a smell of exhaust gasses.

A garage will be able to tell you if the head gasket has gone by doing a pH test on the coolant. Exhaust gasses will turn it acidic (I believe.)

A pint of water a week is a trivial amount for an engine to burn through, it will make no difference to the running. An engine will produce far more H2O from the normal combustion process.

-- Rich

Reply to
Richard Crewe

I like c30! guagua "~^ beancounter ~^" ??????: snipped-for-privacy@k30g2000yqf.googlegroups.com... did ya check around the water pump assy?

Reply to
feifei

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.