Expansion Tank replacement on 98 C70 coupe

evegreen · Post by **evegreen** » 28 Nov 2011, 11:33

Thanks, that was easy, lets hope it fixes the leak.

Post by **cn90** » 03 Aug 2012, 10:14

For those of you who have replaced the Coolant Reservoir, at what year/mileage did your Coolant Reservoir go to heaven?

Mine is now 14y/120K miles and although there is no leak yet, I'd like to do PM.

Post by **cn90** » 08 Aug 2012, 09:36

Q: Grommet on Coolant Level Sensor, has anyone changed that or just leave it alone when switching reservoir?

Post by **cn90** » 12 Aug 2012, 06:40

Some minor little tips to add to this DIY. I have 1998 V70 which has exact same setup as this DIY.

1- For the last few years, I have noticed that I lost 1 cup of coolant per month. I attributed that to evaporation!
Now I know it was coming from the hairline cracks at the bottom of reservoir.
So I strongly recommend people replace their reservoir every 10y/100K miles. It is only $40 at Waltrip Volvo website. And it is genuine Volvo. When it comes to cooling system in any cars, do not gamble with unknown brands!

2- I got all my parts from Waltrip Volvo:
* Reservoir + Cap
* 2 hoses to reservoir
* Tstat and 2 bolts (it is another topic)
* Radiator petcock

3- I need to flush the antifreeze anyway, so I drained from radiator petcock (6-mm Allen key).
Put in new petcock.
Note the small O-ring at the very tip of the petcock, that is what seals the coolant!

4- Note: Hose near firewall ---> 7-mm hex to remove clamp.

5- I used Advance Autoparts Coolant (made by Prestone).

6- Note: the Coolant Level Sensor fits in the blind recess at the bottom of the reservoir.
The sensor does not touch the coolant. It senses the level via the magnetic floater inside the reservoir.

7- Once done, fill with 50-50 coolant mix.
- Go for a test drive around the blocks (don't go too far!) with spare 50-50 coolant in the trunk!
- If you drain from the radiator like I did.....you will need another 0.3 Gallon or so! Just wait until the car cools down to add coolant.

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See the pics:

: VolvoReservoir01.JPG (120.5 KiB) Viewed 2343 times

: VolvoReservoir02.JPG (83.48 KiB) Viewed 2343 times

byeboy · Post by **byeboy** » 12 Aug 2012, 18:41

I just replaced mine and the cap (FCP Groton) on my 97 850. If you list where in Texas you are, a forum member who has done this may be able to drop by (or have you drop by) and guide you step-by-step.