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What did you do to your Volvo today?

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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bmdubya1198
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Re: What did you do to your Volvo today? (now Sticky)

Post by bmdubya1198 » Fri Aug 09, 2019 7:51 am

It depends how hot it got. If there's a blockage due to the thermostat and that's what over pressurized the reservoir, the gauge likely wouldn't have moved if you caught it quickly. These gauges don't tend to respond very quickly.
2000 V70R Venetian Red/Charcoal M56 Swapped 193k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 162k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 172k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
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

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Re: What did you do to your Volvo today? (now Sticky)

Post by ZionXIX » Fri Aug 09, 2019 11:31 am

bmdubya1198 wrote:
Fri Aug 09, 2019 7:51 am
It depends how hot it got. If there's a blockage due to the thermostat and that's what over pressurized the reservoir, the gauge likely wouldn't have moved if you caught it quickly. These gauges don't tend to respond very quickly.
Update: Rented a coworkers car for $5 and got some coolant at the local parts store down the street. It looks like only the coolant in the reservoir boiled off and no coolant has been lost in the last 30min just sitting there. It took 2 tries to start the engine. I'm thinking there may also be a coolant leak in one of the cylinders or the gasket getting the plugs wet maybe?. No bubbles seen in the tank though while running. I'm gonna change out the thermostat this weekend and maybe scope the cylinders and see if there is any pooled coolant. Since fluid is routed to the reservoir through the top hose I would likely not see any bubbles unless I over fill the tank?

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Re: What did you do to your Volvo today? (now Sticky)

Post by BlackBart » Fri Aug 09, 2019 3:30 pm

Years ago our '94 850 overheated a couple of times. It was the big relay at the top of the radiator shroud, which controls the electric fan. When sitting still, it wouldn't come on. Replaced it quickly and no problems since.
ex-1984 245T wagon
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Is it time for a 1964 122 wagon?

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Re: What did you do to your Volvo today? (now Sticky)

Post by ZionXIX » Fri Aug 09, 2019 6:19 pm

What temperature does the relay kick the fan on? I watched it today and at 206 F the coolant had expanded to the point where I was sure an overflow would happen. I turned the AC on and the temps came down quick.

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Re: What did you do to your Volvo today? (now Sticky)

Post by bmdubya1198 » Fri Aug 09, 2019 7:22 pm

Sounds like your low speed may not be working. You can test it by either grounding or applying 12V to the yellow and yellow/white wires (not sure which, I believe ground... it's best to check first!) one at a time.

Dropped in my do88 intercooler today as well as replaced the battery cable to the starter. Unfortunately it didn't fix the boost leak (I have no idea how... I was almost certain the IC was the problem) but at least it'll help once I get it boosting properly. I think it may be time for a turbo... I don't know what else it could be.
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2000 V70R Venetian Red/Charcoal M56 Swapped 193k
2000 S70 GLT Mystic Silver/Taupe 2??k
2003 S60 2.4T Silver/Black 108k
2007 XC90 V8 AWD Sport Titanium Grey/Black 162k
1993 944 Base Beige/Beige 221k
1991 944 Turbo Dark Green/Beige 172k
1992 245 Base White/Beige 249k
Sold-
1998 V70 GLT Black/Beige 199k
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

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Re: What did you do to your Volvo today? (now Sticky)

Post by abscate » Sat Aug 10, 2019 3:27 am

ZionXIX wrote:
Fri Aug 09, 2019 6:19 pm
What temperature does the relay kick the fan on? I watched it today and at 206 F the coolant had expanded to the point where I was sure an overflow would happen. I turned the AC on and the temps came down quick.
My P80 cycles fan between 105C ( on) and 87C (off)

105C is about 221F
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Re: What did you do to your Volvo today? (now Sticky)

Post by abscate » Sat Aug 10, 2019 3:21 pm

Inspected my B+ cable to fuse box motivated by recent experiences here

Colour coded my fuses on the fuse box cover diagram
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Re: What did you do to your Volvo today? (now Sticky)

Post by abscate » Sun Aug 11, 2019 10:25 am

Test

Thread should be good now

I think I fat fingered a lock on my last post , sorry about that.
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

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ZionXIX
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Re: What did you do to your Volvo today? (now Sticky)

Post by ZionXIX » Sun Aug 11, 2019 10:30 am

abscate wrote:
Sun Aug 11, 2019 10:25 am
Test

Thread should be good now

I think I fat fingered a lock on my last post , sorry about that.
It happens

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ZionXIX
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Re: What did you do to your Volvo today? (now Sticky)

Post by ZionXIX » Sun Aug 11, 2019 10:38 am

So I took a crack at the thermostat replacement. I have been periodically spray penetrating oil for the last few day. I hate tha :? :? t I have to disconnect the fuel line to reach one of the bolts. I incidentally discovered no fuel pressure in that line but it has been sitting for 36 hours, so maybe I dont need to investigate?
Anyway, I took my T40 and a breaker bar and just gently tried working the bolt back and forth. I could hear abs see the bolt turning a small amount, like 15 degrees or so.
I have a backup vehicle.
I have the weekend off.
And the wife is out having a girls weekend.
The risk was acceptable.
I decided to go for it.

Broke my only T40 bit :?

Thermostat bolt: 1
Me: 0

If the head snaps off, the housing should just lift off right?
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