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About Ray Niemi
Expertise
ASE Master Rated. Ask any questions about Volvo models up to 2000. Runnability, starting and charging system, diagnostic codes, brakes, front end, where to get certain parts. Should I buy this Volvo or not? I will try to answer your question and give you the knowlege to make the best decision in your case.

Experience
I started working on Volvo's in 1978 at the dealer and attended all the schools and achieved a Master rating. Since 1999 I have worked at independent shops and now own my own shop.

Organizations
Alldata on line repair manuals. IATN network of techs.
ASE rating of Master.

You are here: Experts > Shopping > Cars > Volvo > mystery coolant

Volvo - mystery coolant

Expert: Ray Niemi - 11/4/2009

Question
hello saul here with this problem my 850 runs good but no heat and the reservoir starts empty whe the temperature goes up starts filling up and bubles like is overheating but is not, i change the thermostat i open the purge to get the air out but still no heat look like the coolant its not pump from the waterpump but the weird this is the car dont overheat so thats the mistery coolant please advise

Answer
Saul,
If there are bubbles in the cooling system you could have compression leaking into the cooling system. That might be a bad head gasket or warped or cracked head, and the coolant is getting burnt in the combustion chamber. It is time to get the car to the shop for further testing. Sometimes the heater core leaks, and the coolant ends up inside the car.

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