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98 v70 GLT expanding coolant

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

stephansvolvo
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Year and Model: V70 GLT 1998
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stephansvolvo

98 v70 GLT expanding coolant

Post by stephansvolvo » Thu Oct 17, 2019 7:34 pm

a few months ago, i was sitting at idle and suddenly steam started rolling from under the hood. I opened it and found coolant pushing out from under the expansion tank. No over heating although the coolant temp gauge did notch up a few lines.
I replaced the cap with a new one. Added more fluid and I have been driving it with it. I have not had it do that again until tonight.
I daily drive fairly short distances and do not idle. Tonight I drove to Portland, 2.5 hours, and as soon as I got off the highway and hit a red light the temp gauge went up a couple of notches and I saw steam. Did not over heat according to the gauge.
I replaced the head and all that Jazz five years ago.
I changed my oil 3 months ago and I didn’t notice any coolant in it. I have not tested the coolant, yet.

Any Thoughts?

Thanks
Stephan


Stephan
84 240GL my first(sold)
88 240GL(timing belt killed it)
98 V70 GLT

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bmdubya1198
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bmdubya1198

Re: 98 v70 GLT expanding coolant

Post by bmdubya1198 » Thu Oct 17, 2019 9:05 pm

How old if your thermostat? That may have failed and blocked coolant flow. If you've ruled out any blockages, it would be smart to either do a leakdown test or test for exhaust gases in the coolant. You can rent or buy a kit from Auto Zone to test for exhaust. I'd start with that test, it's very easy.
Ideally, you'll find a blockage and you don't have any head gasket issues.


2000 V70R Venetian Red/Charcoal M56 Swapped 191k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 160k
1993 944 Base Beige/Beige 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it


Need used parts? PM me!

stephansvolvo
Posts: 314
Joined: Mon Nov 25, 2013 3:36 pm
Year and Model: V70 GLT 1998
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stephansvolvo

Re: 98 v70 GLT expanding coolant

Post by stephansvolvo » Fri Oct 18, 2019 4:24 pm

bmdubya1198 wrote:
Thu Oct 17, 2019 9:05 pm
How old if your thermostat? That may have failed and blocked coolant flow. If you've ruled out any blockages, it would be smart to either do a leakdown test or test for exhaust gases in the coolant. You can rent or buy a kit from Auto Zone to test for exhaust. I'd start with that test, it's very easy.
Ideally, you'll find a blockage and you don't have any head gasket issues.
Tstat is 4.5 years old. I purchased a new one and will install it this weekend. I might as well do the coolant test too. While I’m in there.


Stephan
84 240GL my first(sold)
88 240GL(timing belt killed it)
98 V70 GLT

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bmdubya1198
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Joined: Tue Dec 30, 2014 10:45 am
Year and Model: '98 V70 GLT
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bmdubya1198

Re: 98 v70 GLT expanding coolant

Post by bmdubya1198 » Fri Oct 18, 2019 9:01 pm

Good deal, let us know how it goes.


2000 V70R Venetian Red/Charcoal M56 Swapped 191k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 160k
1993 944 Base Beige/Beige 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it


Need used parts? PM me!

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ZionXIX
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ZionXIX

Re: 98 v70 GLT expanding coolant

Post by ZionXIX » Fri Oct 18, 2019 9:09 pm

Mine was doing exactly the same thing. My fan was not engaging unless the A/C was running. It turned out to be a bad temp sensor. Replaced it and all went back to normal. I tried the thermostat first and then the fan relay. I had a bluetooth obd II reader showing normal temps the entire time. My temp sensor was reporting false numbers to the ecu. The easy thing is to start the car with hood open and the A/C off. Watch as the coolant expands and see if the fan comes on. The fan should activate well before the coolant reaches the tops. If it doesnt kick on try turn the A/C on, if the fan works then you may have a bad temp sensor or a corroded plug. Just my experience.



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bmdubya1198
Posts: 3326
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: '98 V70 GLT
Location: Charlotte, NC
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bmdubya1198

Re: 98 v70 GLT expanding coolant

Post by bmdubya1198 » Sat Oct 19, 2019 8:11 am

I was going to mention that too, make sure your fan is running. There are a couple reasons that will stop, the ECT sensor, the relay, and the fan itself all being possibilities.


2000 V70R Venetian Red/Charcoal M56 Swapped 191k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 160k
1993 944 Base Beige/Beige 221k
1992 Miata Mariner Blue/Black 146k
Sold-
1998 V70 GLT Black/Beige 193k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k- Never should have sold it


Need used parts? PM me!

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