Location of Coolant Temperature Sensor

sealuva · Post by **sealuva** » 15 Aug 2011, 11:17

Can someone show me with a picture of where this is located. I saw one on this site somewhere but the picture was horrible. 1998 S70

Location and picture. Thanks all.

Post by **jblackburn** » 15 Aug 2011, 11:18

Thermostat housing right by the power steering pump. CTS is the brass plug you see here.

sealuva · Post by **sealuva** » 15 Aug 2011, 11:22

Is it as easy as unscrewing it and taking it out and plugging in a new one? I want to change both the thermostat and this part. Thanks

Post by **jblackburn** » 15 Aug 2011, 11:28

You'll need to drain a bit of coolant first. Probably a good time to change it (should really be done every 3 years or so).

https://www.matthewsvolvosite.com/2009/0 ... 0-or-xc70/

sealuva · Post by **sealuva** » 15 Aug 2011, 11:37

Do I need to drain this for just the sensor or just to change the thermostat? Also is it as easy as unscrewing it and screwing in the new one? Thanks again for all your help.

Post by **jblackburn** » 15 Aug 2011, 11:40

The Torx bits on the housing can be a real pain to get out. Spray both of them over the next few days with lots of PB Blaster and hopefully they should come right out.

Dealers, if they're close by, sell new bolts that are metal instead of the crappy aluminum they used for the ones probably still in there.

The coolant level will need to be lowered before you open up the thermostat housing or you'll spill it everywhere. Thermostat housing needs to be removed to really get access to the CTS plug on a 1998 model - then yes, just unscrew the old and and screw the new one in. Take a look at that link above.

Post by **Ozark Lee** » 15 Aug 2011, 11:44

As Justin said, you will need to remove the upper portion of the thermostat housing to get to it and you should drain some coolant before you remove the cap. I remove the lower radiator hose and drain out 1/2 gallon or so. I would advise not using the drain cock since it is prone to breaking at the the base of the radiator.

...Lee

sealuva · Post by **sealuva** » 15 Aug 2011, 12:13

Thanks everyone.

mike walter · Post by **mike walter** » 15 Aug 2011, 12:40

The torx bolts can be a bit tight. Let the engine warm up, loosen slightly, not enough to allow coolant to escape.I install a clamp on the hose leading to the block from the over flow box and pull the box out of the mounts and lay it behind the engine. You will loose very little coolant this way.

seth1991 · Post by **seth1991** » 06 Dec 2011, 17:28

Sorry to revive this thread, and I've bumped a thread of my own, but are the steps listed for the 98 V70 the same as for a 1999? My CEL is on with the code P0118, which I believe to be the ECT Sensor failure code. I just wanted to make sure before I buy the part [also replacing the thermostat]. Thanks!