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Guide: Replacing Thermostat

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Old Mar 22nd, 2011, 16:00   #1
Volvon
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Last Online: Nov 13th, 2020 07:29
Join Date: Mar 2010
Location: The Land of Ice & Snow
Default Guide: Replacing Thermostat

Engines: 1.6/1.8/2.0 Petrol

Symptoms: Poor MPG, Low engine temp, poor heat output on heater.

Time required: 15 Mins

Tools required: Torx driver (sorry forget what size..)

NOTE: Ensure engine is cool before attempting or risk of scalding.

Engine temp should be around 90°C anything below this indicates a fault. My car was running at 78°C, I have seen some worse and some better. For a while mine ran at 85°C and I didn't believe the thermostat to be at fault. I was wrong, 960KG was right (I'm going way back here..).

Follow top radiator hose to locate thermostat cover and remove the 2 torx bolts (you will lose about a cup full of coolant):



Move hose out of the way:



Remove old thermostat:



Ensure new thermostat is correct and ensure it comes with O ring:



Fit new o-ring onto new thermostat:



Install new thermostat:



Retighten thermostat cover torx bolts:


Top up any lost coolant. Coming into Spring summer I just topped up with distilled water. Any other time I'd replace coolant.

Job Done Put kettle on.

Maximum temp car achieved on tickover with old thermostat:


Maximum temp car achieved on tickover with new thermostat:


The difference is significant! I haven't been for a drive yet, but I bet the MPG is improved massively! I have to do a 200km drive to Helsinki on Thursday, a good MPG test. With faulty thermostat I got around 37 MPG on motorway runs, I will report back Thursdays finding and see, once and for all just how much a thermostat affects MPG.


Edit: Original thread
__________________
1999 V40 1.9D (D4192T2 engine)
Current mileage: 211,000 miles
Average MPG: 54.4



Last edited by cumbrianmale; Nov 22nd, 2012 at 14:28. Reason: link back
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