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98 s70 overheating

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

ashvolvo
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Re: 98 s70 overheating

Post by ashvolvo » Fri Aug 24, 2018 5:26 pm

Use genuine parts only for the engine coolant temp sensor, do not use after market parts for it. It is called as Temperature sending unit. It is recommended that you change the ECT sensor and Thermostat together. They typically last between 60-80K miles before they start malfunctioning. Here are links from FCP

https://www.fcpeuro.com/products/volvo- ... -9125463oe

https://www.fcpeuro.com/products/volvo- ... s-271664oe


1999 S-70 GLT @168K Miles
1987 740 GLE- Donated @215K Miles

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Re: 98 s70 overheating

Post by RickHaleParker » Fri Aug 24, 2018 6:12 pm

I think Wahler is commonly used without problems, about $12

Wahler is a BorgWarner aftermarket line. BorgWarner claims Wahler is built to the same quality, service life and operational reliability as OEM.


Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

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----------------------------------------------------------------
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Re: 98 s70 overheating

Post by dj_v70 » Fri Aug 24, 2018 6:45 pm

I don't believe any of these codes have anything to do with your overheating issue. Googling P0176 says it is for a fuel issue. Someone else will chime in if I am incorrect here.

Based on the information that you have provided so far, it doesn't sound like your issue is the thermostat.

You have noted that it takes something like 10 miles to get up to temperature. That is likely the thermostat stuck partially open. This is a common issue with these cars. A thermostat stuck open keeps your engine cooler, not hotter though, so it is unlikely to be your overheating issue. I bought my 2000 v70 with a thermostat that was stuck open, it took about 10 miles to get up to temperature also, it didn't overheat.

It isn't hard to replace thermostat, I recommend using youtube to get in-depth instructions.



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Re: 98 s70 overheating

Post by abscate » Fri Aug 24, 2018 6:46 pm

Wahler, Vernet or OEM Volvo on those parts.

You will need a Torx bit set on the thermostat bolts. Lowe’s has a Kobalt brand which is decent. You want To get the bit firmly in the head socket then give it about 20 light raps with a small hammer. You are shocking the threads to loosen them up for removal. Don’t distort anything, just rattle their world a bit.


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ashvolvo
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Re: 98 s70 overheating

Post by ashvolvo » Fri Nov 08, 2019 11:31 am

Do not put after market for Temperate sender unit. Put Genuine Volvo

Here it is
https://www.fcpeuro.com/products/volvo- ... -9125463oe

here is the thermostat
https://www.fcpeuro.com/products/volvo- ... s-271664oe

You will need a T40 to open the 2 screws on top of the thermostat housing unit. sometimes they are a bit*h to take off.


1999 S-70 GLT @168K Miles
1987 740 GLE- Donated @215K Miles

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Re: 98 s70 overheating

Post by MoVolvos » Fri Nov 08, 2019 11:48 am

scot850 wrote:
Wed Aug 22, 2018 10:42 am
Thermostat sounds like a good probability as suggested above. Also check that the cooling fan is working.

Neil.
I agree. Every single description and detail of the problem described by Kprixie happened to my former 98 S70 T5. At first I thought it was a head gasket also but before doing the work I replace the expansion tank and cap but the problem persisted. What I found was the thermostat was missing. The problem could be an opened thermostat so the temperature fluctuated even goong low then overheat (needle in red). I am not sure that it is truly overheating but you have to take the precaution thinking it is.


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Re: 98 s70 overheating

Post by misha » Fri Nov 08, 2019 3:55 pm

Kprixie wrote:
Fri Aug 24, 2018 2:09 pm
...Also does anyone know a good brand reliable for the sensor I can order myself online...
Vernet or Wahler.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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Re: 98 s70 overheating

Post by misha » Fri Nov 08, 2019 4:00 pm

RickHaleParker wrote:
Fri Aug 24, 2018 6:12 pm
I think Wahler is commonly used without problems, about $12

Wahler is a BorgWarner aftermarket line. BorgWarner claims Wahler is built to the same quality, service life and operational reliability as OEM.
Wahler IS OEM(read OE).
On original thermostat it's stamped Volvo AND Wahler....at least on EU market cars.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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