How to Replace Coolant Expansion Tank on Volvo 850/S70/V70/C70

I’m changing [my coolant expansion tank] out this weekend. It’s not a hard procedure at all – just please don’t order the aftermarket crappy one. I ordered a genuine Volvo one, and they sent me the aftermarket version. Mine broke in 3 months.

Expansion tank Volvo 850

Expansion Tank replacement on 98 C70 coupe

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Date August 17, 2011

3 responses to “How to Replace Coolant Expansion Tank on Volvo 850/S70/V70/C70”

  1. Dennis says:

    2000 V70XC AWD. Well, Matt. I purchased the aftermarket version from a good source on the internet and installed it in July of 2010. No problems, except today, on an out of town trip.

    Since installing it, I began noticing the smell of coolant inside the cabin. I kept a wary eye on the heater coil, thinking that may be the culprit. After a while, I concluded that the odor was from the engine compartment. Never saw any leaks, though.

    Tonight, after topping off the tank earlier, the low level indicator came on. I pulled over before committing myself to the highway and discovered a drip originating on the underside. Made it home, let it cool and just pulled it.

    (By the way, WHO THE HELL IS THE VOLVO ROCKET SCIENTIST who came up with the idea of attaching the power steering reservoir to the coolant bottle with a clip tab and two interfering rims? It’s seems to be a one way in design. Not to mention, locating the coolant bottle UP AGAINST THE INSIDE WHEEL WELL WHERE VIBRATION FROM USE WILL CREATE A WEAR-THROUGH ON THE BOTTLE??!!)

    Ok, got that off my chest (though, I hope whoever it was, rots away in a Fiat factory). Anyway, my question, since I cannot locate any problem on the bottle or the main coolant line hose that attaches to the bottom, does Volvo use a pipe sealant on the tank nipple, before clamping the hose down? When replacing it last summer, I noticed a tan residue, inside the end of the hose. I also see something similar on the opposite end of the hose, where it attaches to the metal ‘T’.



  2. John B. says:

    My 97 850R had a long crack in the tube (that the hose slips over). For a “weekend fix” I removed the hose, cleaned it all up (had been leaking a lot of coolant)(I love Simple Green). then slipped a piece of Heat Shrink Tubing over the ‘nipple”, carefully shrunk it with hair dryer,let it cool, then slipped the hose back on and clamped it. Its been “as new” for two weeks now, and it made a sanitary “fix”. I’ll be keeping my eye out for a nice original, because I’m sure it’ll let go at the worst possible time…Cars know these things…

  3. brian says:

    Has anyone had problems with the low coolent light coming on?? And how do I clean the sensor??

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