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Coolant bleeding

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

dubsetter
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dubsetter

Coolant bleeding

Post by dubsetter » Thu Dec 08, 2016 12:08 pm

I recently replaced my thermostat sensor. After taking my 850 for a test drive afterwards, my coolant light started randomly flashing on and off sporadically (I figured I didn't clip the coolant reservoir sensor all the way in). When I pulled onto my street the light stayed on. When I got out I noticed I had lost a decent amount of coolant which came out of the thermostat housing. Luckily I was pretty close to home when the light started flashing on and off.

I ended up stripping one bolt trying to get the housing off. After finally drilling the bolt out last night, I found a small piece of plastic from a zip tie which fell on top of the gasket that I didn't see when I put the housing on.

I picked up a new gasket and volvo coolant and am ready to add coolant back in. I know the thermostat has a bleeder hole and I've read you should let the car idle for 10min to bleed the air out. My question is, do I leave the reservoir cap on or off(I read a forum where someone mentioned leaving the "cap" off)

Thanks

jblackburn
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jblackburn

Re: Coolant bleeding

Post by jblackburn » Thu Dec 08, 2016 12:34 pm

Leave the cap off; refill when the thermostat opens. Put the cap on and drive around the neighborhood. It may empty the reservoir again.

After ~2 fill-ups, you should be fine. Keep an eye on the coolant level (and possibly a jug in the car) for a week or so as it works the air bubbles out.
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dubsetter
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dubsetter

Re: Coolant bleeding

Post by dubsetter » Thu Dec 08, 2016 4:07 pm

Great thanks! Unfortunately when I went to loosen the drain valve at the bottom of the radiator it snapped off. Ahhhhhhhhhhh!!! Since the valve is still closed, I guess I am going to drain from the lower radiator hose.

It looks like I will be able to remove the broken part stuck inside the radiator with a hex key(hopefully)

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abscate

Re: Coolant bleeding

Post by abscate » Thu Dec 08, 2016 4:15 pm

Leave that broken part in and epoxy it in place. Usually if you try to remove it you goober up the plastic threads and end up epoxyimg the hole anyway
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