2006 V70 Transmission cooling

chuckV70 · Post by **chuckV70** » 25 May 2015, 18:58

I am towing sometimes with a 2006 V70 FWD 2.5T automatic and with my OBD2 scanner I can read the coolant temperature and the transmission fluid temperature and they are almost always the same or off by a degree. I have changed the transmission fluid and would like to keep an eye on the temperatures so can anyone answer the following questions.

1) where does the transmission fluid temperature reading get taken?

2) if the information display tells you the transmission is starting to get to hot what temperature readout would it corrospond to.

3) is it worth installing a transmission cooler and or filter (I do plan on doing a fluid replacement yearly. Gibbson method)

Thanks

Post by **jimmy57** » 25 May 2015, 22:37

The fluid temp sensor is located on the cooler line outlet for fluid leaving trans to go to cooler.

There would not be a warning until the fluid gets to around 150C

The fluid temp not going over 105C would be great. Short periods of 115C is ok.

You are in a cold climate and over cooled fluid can be an issue too.
How heavy is trailer and do you tow it slowly or is it used on highway?
Flat terrain or hilly terrain?

Post by **precopster** » 26 May 2015, 07:39

As above ^^
The transmission fluid temperature mirrors the coolant temperature because:

1) They share the same radiator which transfers the coolant temperature directly to the trans fluid via the brass tube inside the radiator.

2) By heat transfer of the large block surface touching the transmission surface.

The hotter climates in tandem with towing will suit an external cooler which has the radiator bypassed.

In milder climates running the external cooler in series with the inbuilt radiator cooler is ideal.

In cold climates no external cooler is required unless heavy towing is done.

The temp sensor is built into the valve body on the transmission and monitors as jimmy57 stated.

Post by **vtl** » 26 May 2015, 08:42

ATF is cooled/heated by coolant, that's why you read almost same temperatures. Extra cooler is a very good thing, especially if you tow. Because ATF cooler return line has to be cut, it is a good time to install inline Magnefine filter, which removes/reduces worn clutch material in ATF.

I wouldn't bother with thermostat, didn't see a glitch with both P2s w/ extra cooler in last couple of winters.

chuckV70 · Post by **chuckV70** » 26 May 2015, 20:31

Thanks for the great info thats what I really needed. I'm towing a small camper. I had it weighed in at 2720 lbs with propane full battery etc loaded so I'm well under the max towing weight. It has electric brakes and anti sway and tows really good. It didn't even flicker in high winds with trucks passing recently. I paid a certified scale to give me a print out and weighed the total weight and each axel. All within limits. The only thing that I do is lock it in 4th gear on the highway and tow between 85 and 95 km/hr depending on the wind. I really find it tows great until 70 km/hr before you start to notice a lot of resistance. I've been using ODB2 to monitor temps and it never went above 95 on the highway and got to about 105 with a little stop and go and some lights. Was not the hottest day of the year in Ontario though. That being said I'm quite glad to know its quite a ways off the limits.

chuckV70 · Post by **chuckV70** » 26 May 2015, 20:32

Quite interested in the magnafine filter. Anyone know the part number id need or have a good link.

Thanks

Post by **vtl** » 26 May 2015, 20:49

Search for 'Magnefine 3/8" inline filter' on ebay.