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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Temperature GaugeViews : 441 Replies : 3Users Viewing This Thread : |
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#1 |
Senior Member
Last Online: Jun 15th, 2024 16:05
Join Date: May 2007
Location: Norwich
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Hi - I've recently changed the thermostat in my T5 as the old one was jammed open, but now temp gauge sits at just above 3 o'clock when the engine has fully warmed up. It should sit at 3. Am I right in thinking it could be the temp sender at fault and is this scewed into the thermostat housing?
or do I have a faulty gauge - if so how to I test these components? (I have digital and analogue multimeters) Jeremy
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2005 XC70 AWD D5 SE LUX (163) 206K Previous Volvo's, 1996 855 T5 CD Aubergine 855 N/A CD, 940 Wentworth, 760 Estate,740 Estate, 240 DL Estate,240 GLT Estate |
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#2 |
VOC Member
Last Online: Nov 6th, 2016 10:18
Join Date: May 2009
Location: Blackpool UK
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Have a read of This]Thread Where I detailed how to check the temp sender unit with a DVM set to OHMS, might be a case of de-javu though - Mike
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#3 |
Senior Member
Last Online: Jun 15th, 2024 16:05
Join Date: May 2007
Location: Norwich
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thnks Mike, I feel pretty stupid now! I was focussed on the cold running issue and not the warm, changed the stat and then forgot what you posted re the temp sensor. A trip to Maplins for me...
__________________
2005 XC70 AWD D5 SE LUX (163) 206K Previous Volvo's, 1996 855 T5 CD Aubergine 855 N/A CD, 940 Wentworth, 760 Estate,740 Estate, 240 DL Estate,240 GLT Estate |
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#4 |
VOC Member
Last Online: Nov 6th, 2016 10:18
Join Date: May 2009
Location: Blackpool UK
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Just take the sender unit out of the engine and connect your DVM to the two wires coming out of the plug, pop it in a pan of cooking oil along with a thermometer capable of reading to at least 120 deg C, heat the oil and take spot temp readings vs resistance from the meter and compare them with the graph, if it looks out of place once you get above 80 Deg C change the temp sender unit.
The reason I suggest using oil in the pan is that water will boil at 100 Deg C but oil doesn't so you take it to the 120 temp, once complete turn the heat off and let it cool down slowly, don't be tempted to cool it with running water as you will probably get burnt by the resultant steam and shock cooling will damage the sender unit - Mike |
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