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2004 C70 coolant leak

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

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MoVolvos
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MoVolvos

Re: 2004 C70 coolant leak

Post by MoVolvos » Tue Oct 29, 2019 3:48 pm

abscate wrote:
Tue Oct 29, 2019 11:58 am
I think those hoses run wash fluid not coolant. Still green and will smell like alcohol.
Agree, it's a low pressure system so the yellow T has barbs instead of using hose clamps. The coolant reservoir should be at the top of the engine also. Shouldn't be able to see it from the bottom. One hose is attached to the black circular pump and the T separates the water to the hood nozzles. Could be .0001 wrong however.

https://www.volvopartswebstore.com/show ... evel=11161

This is the coolant tank with hose clamps and is on top rather than below the engine. Being Volvo have expansion tanks you need to keep an eye on it whereas other cars have overflow tanks which are not part of the pressurized system so can be mounted anywhere.

https://www.volvopartswebstore.com/show ... evel=11161
Blessings,

BKM

1998 S70 T5 - Donated
2003 S80 T6
2003 GS300
2003 Odyssey
2008 C30 T5
2019 Atlas SE 4 Motion

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Re: 2004 C70 coolant leak

Post by scot850 » Tue Oct 29, 2019 11:14 pm

If the temp gauge gets to 3 o'clock relatively quickly then the thermostat is probably ok for now. If it takes a long time to get there then it may be needing replaced.

The 5 speed auto dip-stick is a real pain to get to. You are supposed to check it when warm. I take it to the dealer for them to check to save burning my fingers due to location. On a turbo you have to remove the cold air intake pipe and then dig down the bottom to the rear of the radiator on the drivers' side (LHD). You will have to try to find a way around the turbo intercooler intake pipe and the wiring loom and it is under the loom. Not fun to access.

That leak f fluid looks like the pipes for the wind-shield washer system. Pipes fail with age, but has the system been frozen at all? If it has and it has summer fluid in the system it can cause the tank or pipes to split.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

DrJammer
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Re: 2004 C70 coolant leak

Post by DrJammer » Thu Mar 05, 2020 8:35 am

So I finally got the 2004 C70 long enough to work on the coolant issue. This is the 2.4L model and do not, I repeat, DO NOT, try to replace the therm like the P80 models. I opened up the housing only to learn you have to replace the entire unit. Thought I was gonna use an $8 stant, but ended up having to remove and replace P/N 31293700. Ouch. lesson learned.
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2004 v70 N/A - traded in at 75k
2008 S60 - leased
1998 S70 T5 - might still have her if I knew about this forum when I owned it

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Re: 2004 C70 coolant leak

Post by scot850 » Thu Mar 05, 2020 12:12 pm

OOOH! That hurts. You learn something new every day.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

Richard99
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Re: 2004 C70 coolant leak

Post by Richard99 » Thu Mar 05, 2020 1:11 pm

abscate wrote:
Tue Oct 29, 2019 11:58 am
I think those hoses run wash fluid not coolant. Still green and will smell like alcohol.
Yes, those are washer fluid lines.
Eric

1998 Volvo V70
2000 Volvo V70XC

DrJammer
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Re: 2004 C70 coolant leak

Post by DrJammer » Fri Mar 06, 2020 2:11 pm

New therm housing unit is it. As for the washer fluid lines, I cut a bit away from the yellow barb T, and just refitted on to stop the leak.

I replaced the coolant tank and level sensor and have the sensor light on full time now. I admit I got a Behr tank, which I figured was a bit more trusted. What is the deal, the sensor only responds correctly to OEM tank? Even after all the reading, I tried to save my buddy some bucks. The Behr tank has a float that is free, so I trapped it on the bottom with 2 screwdrivers, dash radiator light remained on. I tried undoing the sensor a few times, turned over the tank, made sure sensor is snapped in.

Is this only resolved with an OEM tank?

Thanks, get the C70 away from me!
Ex-Volvos
2004 v70 N/A - traded in at 75k
2008 S60 - leased
1998 S70 T5 - might still have her if I knew about this forum when I owned it

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Re: 2004 C70 coolant leak

Post by scot850 » Fri Mar 06, 2020 3:08 pm

If you replaced the coolant tank and the sensor it should be good. Check the connector for the coolant level sensor. I have seen the wires getting broken when people try to lift the tank too high without disconnecting it once it is high enough to give access. It may be a broken wire or bad connector. Check for bent pins. Did you try connecting the original level sensor to it and seeing if that has the same issue?

Sorry didn't catch the leaking washer bottle pipes. Thankfully there are smarter guys here that caught it.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

DrJammer
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Re: 2004 C70 coolant leak

Post by DrJammer » Fri Mar 06, 2020 5:00 pm

I have replaced a few coolant tanks in S/V 70s and know to be careful with draining coolant and disconnecting hoses and moving P/S tank to be careful with the level sensor wires. I thought I was careful. I changed the tank 1st hoping to re-use the sensor but the low level dash light was on the dash full time regardless of coolant level. Bought a new sensor (not OEM either...shh). So I have a behr tank and URO sensor, but the original sensor gave same reading. Float in new tank looks lame. Before eating another $50 on a OEM tank swap, I may dremel the original tank and take the float from there and put it in the new tank. FYI, the behr tank float may look like crap, but the construction and seams look solid...but I guess that doesn't get the whole job done
Ex-Volvos
2004 v70 N/A - traded in at 75k
2008 S60 - leased
1998 S70 T5 - might still have her if I knew about this forum when I owned it

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wizechatmgr
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Re: 2004 C70 coolant leak

Post by wizechatmgr » Sun Mar 08, 2020 6:24 pm

DrJammer wrote:
Fri Mar 06, 2020 5:00 pm
I have replaced a few coolant tanks in S/V 70s and know to be careful with draining coolant and disconnecting hoses and moving P/S tank to be careful with the level sensor wires. I thought I was careful. I changed the tank 1st hoping to re-use the sensor but the low level dash light was on the dash full time regardless of coolant level. Bought a new sensor (not OEM either...shh). So I have a behr tank and URO sensor, but the original sensor gave same reading. Float in new tank looks lame. Before eating another $50 on a OEM tank swap, I may dremel the original tank and take the float from there and put it in the new tank. FYI, the behr tank float may look like crap, but the construction and seams look solid...but I guess that doesn't get the whole job done
The sensor (at least in mine) clicks into the tank. If you simply push it until it stops it won't be seated correctly. Check and make sure the float didn't get stuck. Your mileage will vary...
Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~187k miles

DrJammer
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Re: 2004 C70 coolant leak

Post by DrJammer » Tue Mar 17, 2020 11:26 am

Could not get the coolant level light to go off, so I ended up purchasing the OEM coolant tank. Another vote for OEM coolant tank, sensor clicked in, and level light seems to behave correctly, for now.

Also, cut open old tank to get float, but floats cannot come and go from tanks as they are bigger than opening. Don't waste your time trying.

OEM coolant tank is a must.
Ex-Volvos
2004 v70 N/A - traded in at 75k
2008 S60 - leased
1998 S70 T5 - might still have her if I knew about this forum when I owned it

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