After my tranny gauge lit up a couple months ago, I got a tranny cooler and then a tranny temp gauge. The gauge is a Autometer and the lowest setting is 100 F. I've been just driving around the city and it's been in the 90s or so. And the gauge doesn't seem to rise above 100F?

I wonder how much my Hayden 168 cooler is cooling the tranny fluid?

I wonder how much it would go up if 4 wheeling in 4 wheel low up a steep hill?

As a side note I get an check engine code PO710-Transmission Fluid Temperature Sensor Circuit Malfunction. So, I need to take it back and get that fixed. The tech that installed the gauge said that at highway driving most people figure the gauge is not working since it does not move off of 100 F. Also he said he installed it to the fluid temp sensor. Can you install a temp gauge to the fluild temp sensor?

Thanks
Bill

 

Your meter isn't working right. When I installed a trans cooler I attached a good thermometer to the bottom of the transmission fluid pan. On hot days (85-90F) I was getting readings up to 150F. Inside the transmission it was probably another 20 to 30 degrees more, as the bottom of the pan gets a decent amount of cooling.

 

Daily drive thanks. Do you or anyone else know if you can install tranny temp gauge sending unit to the the overtemp sensor?

Thanks
Bill

 

I doubt the overtemp sensor was designed to give good gradient readings, and even then it's already in a circuit, so I would not mess with it.

Where is your tranny gauge connected right now? Ideally it would be on the input hose to the cooler.

 

The tech said he spliced it into the overtemp sensor. I'm getting the feeling he may not know what he is doing?
Thanks
Bill

 

STOP GOING TO THAT GUY!!!!!! The autometer gauge gives you a temp sensor. I drilled a hole into the side of my pan and mounted it that way. Mine runs pretty hot on the highway cause my tc isnt locking up. My buddy did the same and his runs about 140 150. If you search on here there are some other guys that spliced a trans line going to the cooler.

 

Ha, thanks. I need to take the truck back and have him fix it. I just want to be educated when I go back on Tuesday.

If I already paid to have the work done and splicing into the temp sensor was a bad idea would they take the oil pan out and install the gauge in there? without charging me more? Or maybe I would get a credit?

Yes, I read about guys splicing the tranny line going to the cooler. I think the pan would give a hotter reading. I want to know how hot the fluid is getting. If it is 10 or so degrees different, it would be no biggie.

Thanks
Bill

 

I wouldnt even have him fix it. I would just try and get you money back if possible. In this case you might have to just count you losses unfortunately. You will come to find that with this type of hobby need to find a shop that is into the hobby or do it yourself if you want it done right. Unfortunately most of the shops into the hobby are strickly Ford, Chevy, and Jeep guys who think a 12in lift and 500hp is the best application for offroad. So like I said before if you want something done right you pretty much have to do it yourself.

 

My Magic 8-Ball says that it's related to the overtemp fault code and why the meter is not showing any readings.

But really, that idea of doing something like that is either gross negligence, gross misunderstanding of how a temp gauge works, or the guy wanted to pocket the sensor that might have been included in your gauge kit. In all 3 scenarios I personally would be very wary of giving them access to my truck again.

 

Thanks guys, it could have been just the tech, different techs could be good or bad. Originally, the one guy I talked with said they'd have to put the sensor in the pan. Another guy said they would try and find a spot on the tranny without having to drop the pan.

If I had the know how, I'd do it myself, but I cannot. I have a brother that is an ex mechanic and he cannot really help with a lot of stuff. It really takes a knack to be a good mechanic and it is really, really difficult with all the different types of cars and trucks.

Thanks
Bill