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1999 s70 overheating in stop-and-go traffic

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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kumulipo
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Year and Model: 1999 S70
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1999 s70 overheating in stop-and-go traffic

Post by kumulipo » Fri Jun 08, 2018 12:30 pm

My new-to-me naturally aspriated 1999 s70 overheats in stop-and-go traffic. I can take heat out of the cooling system by running the heater on full, but its a drag on these warm days. Otherwise, the car stays at nominal heat while driving. Seems to me the problem is in the radiator shroud fan. Can anyone tell me at what coolant temperature its supposed to kick in? Flushing the system while I'm at it for good measure. Thanks!



ecbsykes
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Re: 1999 s70 overheating in stop-and-go traffic

Post by ecbsykes » Fri Jun 08, 2018 1:13 pm

Sounds like your cooling fan is inop. With car on and in park, try turning on the AC and going out to see if the fan kicks in. Could be a bad fan, but more likely just a bad fan relay.

Do not let the needle ever go into the red on these cars. A little bump up from the 3 o'clock position is okay, but anything more and you could quickly be finding yourself with a blown head-gasket.


Ed Sykes
2000 V70XC - Emerald Green - 263,000 miles

kumulipo
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Joined: Tue Feb 06, 2018 9:45 am
Year and Model: 1999 S70
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Re: 1999 s70 overheating in stop-and-go traffic

Post by kumulipo » Fri Jun 08, 2018 2:18 pm

Thanks for the heads up. Will replace the relay with one from the junkyard.
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kumulipo
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Year and Model: 1999 S70
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Re: 1999 s70 overheating in stop-and-go traffic

Post by kumulipo » Tue Jun 12, 2018 12:15 pm

Well, the junkyard relay failed to correct the situation. S70 at the shop as this is over my head for now. Thanks!



scot850
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Re: 1999 s70 overheating in stop-and-go traffic

Post by scot850 » Tue Jun 12, 2018 12:23 pm

Could be a failed thermostat, bad ECT (coolant sensor), bad fan motor or an unlucky bad used relay. There is one other issue it could also be bad wiring on the ECT sensor at the connector by the power steering pump.

Hopefully not, but could be worst case the head gasket.

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

kumulipo
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Joined: Tue Feb 06, 2018 9:45 am
Year and Model: 1999 S70
Location: Merrickville, Ontario
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Re: 1999 s70 overheating in stop-and-go traffic

Post by kumulipo » Tue Jun 12, 2018 12:25 pm

Thanks for the heads up!



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