850 too cool.

02GF74 · Mar 24th, 2015, 19:09

Volvo 850 T5
Replaced coolant temp sensor and coolant, approx 50/50 glycol/deionised water. Drained system by removing the lower radiator hose.

Next days commute (4 miles) noticed car takes longer to warm up, needle reaches 3 o clock pos and sits there, used to take about 10 mins but took 20.

Did a longer journey today at higher speeds 15 miles and needle reaches steady state but never got over 4 o clock. Air coming out of vents does not feel as hot.
If car is left stationary needle will reach 3 o clock and fan keeps it there so i dont think the cts is faulty.

Surely a coolant change cannot account for this, afaik it*was the original stuff that is 20 yrs old. Thermostat was not touched.

Can only think thermostat is stuck open.

Should i be concerned?

I will get IR thermometer to measure coolant temp.

Luxobarge · Mar 24th, 2015, 19:36

Sounds like an open thermostat to me.

toolbah · Mar 24th, 2015, 19:58

You might as well replace thermostat too, especially if it's never been replaced.

Ecurie Ecosse · Mar 24th, 2015, 20:14

Mine did that and it was the thermostat - I didn't change all the coolant before, though.

Less than £50 at a garage to get it swapped including the part IIRC.

toolbah · Mar 24th, 2015, 20:33

http://www.ebay.co.uk/itm/GENUINE-VO...item3367ebd757

It's cheaper if you ring the main dealer direct, that applies to most dealers!!

SteveSarre · Mar 24th, 2015, 21:09

Hi 02GF74

Possibly just a stuck thermostat - unrelated to the change of coolant, but now you have paid the cooling system more attention you have noticed the fault.

Easy fix, so long as you dont mess up the 2 screws holding it in. Be sure to get the right size Torq bit.

Steve

Mar 24th, 2015, 19:09	#1
02GF74 Junior Member Last Online: Feb 23rd, 2024 15:29 Join Date: Feb 2009 Location: se	850 too cool. Volvo 850 T5 Replaced coolant temp sensor and coolant, approx 50/50 glycol/deionised water. Drained system by removing the lower radiator hose. Next days commute (4 miles) noticed car takes longer to warm up, needle reaches 3 o clock pos and sits there, used to take about 10 mins but took 20. Did a longer journey today at higher speeds 15 miles and needle reaches steady state but never got over 4 o clock. Air coming out of vents does not feel as hot. If car is left stationary needle will reach 3 o clock and fan keeps it there so i dont think the cts is faulty. Surely a coolant change cannot account for this, afaik it*was the original stuff that is 20 yrs old. Thermostat was not touched. Can only think thermostat is stuck open. Should i be concerned? I will get IR thermometer to measure coolant temp.

Mar 24th, 2015, 19:36	#2
Luxobarge Premier Member Last Online: Today 18:03 Join Date: Jan 2011 Location: Horne (Nr. Horley)	Sounds like an open thermostat to me. __________________ Some people are like Slinkies, they serve no useful purpose but they still bring a smile to your face when you push them downstairs.

Mar 24th, 2015, 19:58	#3
toolbah Master Member Last Online: Jul 5th, 2017 23:25 Join Date: Jan 2007 Location: Durham	You might as well replace thermostat too, especially if it's never been replaced. __________________ You missed a bit love. Now rub harder!!

Mar 24th, 2015, 20:33	#5
toolbah Master Member Last Online: Jul 5th, 2017 23:25 Join Date: Jan 2007 Location: Durham	http://www.ebay.co.uk/itm/GENUINE-VO...item3367ebd757 It's cheaper if you ring the main dealer direct, that applies to most dealers!! __________________ You missed a bit love. Now rub harder!!

Mar 24th, 2015, 21:09	#6
SteveSarre Premier Member Last Online: Yesterday 09:42 Join Date: Oct 2004 Location: London/West Country	Hi 02GF74 Possibly just a stuck thermostat - unrelated to the change of coolant, but now you have paid the cooling system more attention you have noticed the fault. Easy fix, so long as you dont mess up the 2 screws holding it in. Be sure to get the right size Torq bit. Steve __________________ V70 2.5 Turbo AWD Man. 1999 Red V70 2.5 10V Auto 1998 Green C70 T 20V Auto Conv. 2001 Blue, C70 T5 Auto Conv. 2000 Blue V70 2.5 Turbo AWD Auto 1998 Green, V70 2.5 10V Auto BiFuel 1999 Red (scrapped) V70 20v Auto 1999 Green (scrapped)

Mar 24th, 2015, 20:14	#4
Ecurie Ecosse Senior Member Last Online: Aug 28th, 2023 20:53 Join Date: Aug 2011 Location: Edinburgh	Mine did that and it was the thermostat - I didn't change all the coolant before, though. Less than £50 at a garage to get it swapped including the part IIRC.

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