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Cooling system questions...

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

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Cooling system questions...

Post by AlanS » Fri Jun 17, 2016 8:48 am

2006 XC70- I want to clean out the cooling system. I am sure it has the original anti-freeze. Do I just open the valve at the bottom of the radiator? Or is this not enough? I do not know the brand of anti -freeze in the car now, so I think I have to be careful to not mix brands...or do I? So, how do I clear out all the old? Or does it matter if some is left in, and the new brand does not match?

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Re: Cooling system questions...

Post by oragex » Fri Jun 17, 2016 12:33 pm

The bottom radiator nipple is really fragile. Many broke it when releasing. It takes a hex key (not sure the size but don't put the wrong size on it) with an extension. If it doesn't move with a slight finger pressure on the ratchet, leave it there. Don't fully remove it, only until it starts to flow. Finger tighten it back.

Some prefer to disconnect the lower rad hose (I found it difficult to access) instead of the rad nipple.

Then you need to release the valve that is not apparent but sits behind the engine and remove the coolant res cap.

2006 - if the thermostat is original too, got to replace it now. It about $100 with the housing and I guess it already started to fail by this time.

To rinse, I got a water hose into the system with pressure. When driving with the new coolant and when the engine cools down, the coolant reservoir level will drop a couple of times. Have coolant mixture handy and watch the level/check the low level message.

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Re: Cooling system questions...

Post by vtl » Fri Jun 17, 2016 2:21 pm

Don't replace the whole housing - it's a miserable job. Open cover and replace actual t-stat.

Use OE coolant, it's only like $25 for a gallon. You need one, mix it 50/50 with water.
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Re: Cooling system questions...

Post by abscate » Fri Jun 17, 2016 6:26 pm

I idle the car with the cap off, loosen the Lower hose and run a heavy flow of hide water for 30 minutes until all coolant is gone. Shut down, drain as much water as possible, add half capacity in coolant , top,off with water
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