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S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
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Duff ThermostatViews : 972 Replies : 11Users Viewing This Thread : |
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Jan 12th, 2021, 16:16 | #1 |
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Duff Thermostat
Decided to plug my ELM327 into the car whilst on a long motorway run so I could monitor the coolant temperature.
It didn’t rise about about 75 Celsius, and fell as soon as load was taken off the engine. Me thinks ‘stat has expired in the open position. Any tips on replacing it? Who on earth ever decided it was a good idea to get rid of temperature gauges from cars.... may partially explain my absolutely pants mpg! Car is a MY2010 euro5 D5 205bhp Edit: found a thread on it - https://www.volvoforums.org.uk/showthread.php?t=197671 Think it’ll be going into an independent specialist to be done, too much hassle for the time I’ve got! Last edited by reggit; Jan 12th, 2021 at 18:18. |
Jan 12th, 2021, 18:55 | #2 |
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I read in a forum post that for a job which should be seen as the changing of a consumable, changing the thermostat is not the simple job that it is on most other cars. It's a poor design decision because thermostats slowly degrade and we shouldn't have to wait until the cars performance falls to a low point before realising that the change needs to be done.
On a previous car the regime was to change the thermostat and the coolant temperature sensor every 3 or so years to ensure that the running temperature of the coolant around the block and the coolant temperature reported to the ECU to control the fuelling were accurate and that the engine ran at its most efficient. It used to be the loosening of three bolts, removing the thermostat chamber cover, taking out the old one, putting in a new one, replacing the cover and tightening the bolts. 20 minutes work for the DIY owner.
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2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey |
Jan 12th, 2021, 20:50 | #3 |
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Tell me about it! Used to be a 20 minute job, looks like it may be 2 days!
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Jan 13th, 2021, 18:20 | #4 |
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Last Online: Dec 18th, 2023 19:52
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I'm going to have to get mine changed as well, a recent trip over the tops on the M62 gave a temperature reading of between 90 and 65 degrees. The DPF regen not kicking in if the engine doesn't get up to normal operating temperature during shorter journeys is a concern.
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2011 XC70 AWD SE LUX D5 Polestar Black Sapphire |
Jan 14th, 2021, 01:27 | #5 |
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Its bad enough not having a temperature gauge, but Volvo decided to put the thermostat in the most awkward place to add insult to injury.
Yet another example of what I imagine will be an expensive job to fix a part that would be done in minutes on other cars.
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2007 S80 2.4 D5 - 110,000 miles |
Jan 14th, 2021, 10:46 | #6 |
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Perhaps if Volvo owners shifted their mind set on thermostat replacement and looked at it in the same way as cam belt replacement then we would be routinely scheduling the work every 2 or 3 years regardless of whether we had discerned faults because by that time the thermostat might be pretty far gone and the effects of that would be costing us money in fuel etc any way although we might not notice the gradual drop off in performance over the long period of time it takes for the wax capsule to degrade and fail. What life expectation should we have for this ancient technology component? Whatever it turns out to be, we need to factor that into a routine maintenance and replacement schedule for our Volvos perhaps together with the coolant temperature sensor which also has dramatic effect on performance which can onset slowly with gradual degradation of the sensor before it actually fails.
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2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey |
Jan 15th, 2021, 14:58 | #7 | |
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