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Coolant Leak (2004 V70)

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R
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BobbyC777
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Coolant Leak (2004 V70)

Post by BobbyC777 »

Apologies but I saw hundreds of posts for "coolant leak" and I did not look at them all.

I am starting to lose a little coolant - need to top off reservoir once a month or so. I feared head gasket & then noticed some on garage floor. I am attempting to post a picture - taken from underneath the car looking up. The picture shows a plastic vent tube of some sort that has traces of coolant running down it. What is this tube?

The water pump is not visible as it's behind the timing cover. But if it is leaking (weep hole) does it get flung out by reciprocating parts or just drip in one spot?

Thanks for any tips. I am 10K miles away from a timing belt (due at 240K) so I may try to live with it until then or if it gets bad just accelerate that service.

Bob (North Carolina)
VOLVO_coolant.png
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dikidera
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Post by dikidera »

vtl once said the nipple on the coolant reservoir cracks. It could even be the cap(always by original never aftermarket trust me on this).
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BobbyC777
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Post by BobbyC777 »

Thx - that would be nice if it was the reservoir. BTW I have never been able to release the tab that connects the coolant reservoir to the power steering reservoir. I have tried and tried!
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jonesg
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Post by jonesg »

BobbyC777 wrote: ↑16 Sep 2025, 07:06 Thx - that would be nice if it was the reservoir. BTW I have never been able to release the tab that connects the coolant reservoir to the power steering reservoir. I have tried and tried!
flat screwdriver blade, they usually snap off anyway, even my new one broke.
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BobbyC777
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Post by BobbyC777 »

Thanks. I have seen some videos where it just pops right off and others where both coolant & power steering reservoirs got taken out together as they could not separate them while in place.
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cn90
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Post by cn90 »

At this 240K mileage...
- WP
- Reservoir and its small hose.
- Thermostat gasket and the small hose (I posted some tricks in this forum).
- Radiator itself.
2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+
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BobbyC777
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Post by BobbyC777 »

Good tips! What is this plastic vent assembly in my picture? Thanks!
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br0dy519
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Post by br0dy519 »

Isn't that the water drain for the cowel?
04s60 2.4
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.
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BobbyC777
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Post by BobbyC777 »

br0dy519 wrote: ↑16 Sep 2025, 10:08 Isn't that the water drain for the cowel?
I'm going to go out and turn the hose on right now - thanks!

UPDATE
I just put the hose in each of the 2 cowl drains. Both of them appeared to drain maybe 3 feet aft of what we were thinking was the cowl drain tube exit. Nothing came out of it. I appreciate the suggestion - I thought that was going to be it!
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abscate
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Post by abscate »

That’s the famous P2 viper.

It’s a down draft tube for the ECU box I believe

viewtopic.php?t=89322&hilit=Mystery+tube
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