Kurt G.

Used the IR gun and found the sending unit is reading 25 to 30 degrees higher than actual temp.......SO- where can I find the particular sending unit I've seen mentioned on the forum?? TU-5 or something like that... AND- do I need to drain any coolant prior to removing the old sending unit?? Thanks very much for any advice..

65 vette dude

You can buy it at Auto Zone. It use to be the Wells TU5. I think they now call it their store brand name which is Duralast. It worked for me. You don't have to drain your coolant to change the sending unit.

babbah

ctjackster

buy two, I had to try more than one to end up with one that works well-enough with my temp gauge to provide basically accurate readings.


PS - I am glad you may have found the temp gauge readings themselves to be the issue, rather than a persistant run-hot condition as you first feared:

http://forums.corvetteforum.com/c1-a...questions.html

BarryK

when the original temp sender went bad on my '65 I bought a Wells TU5 as recommended by people on here. It read a full 40º too high.
They seem to be hit or miss on whether or not you will get one that reads accurate.
I ended up finding a guy locally that had a couple used original GM temp sender units and bought them. After measuring the OHM's with a meter I choose the one that read closest to what it should be and used it. It's accurate within about 7º. Not perfect but a whole lot better than the 40º off I got with the Wells TU5.
Other people have had luck getting a TU5 units though that worked for them so like I said, it seems to be hit or miss.

Kurt G.

Thanks for ALL the replies.......

Kurt G.

Yeah, I was driving myself nuts trying to figure this thing out....But when you're doing it all yourself, it can wear on you. Luckilly the guys on this forum have been a HUGE resource of info.....Thanks.

midyear1

LectricLimited now has temp sending units that they claim are more accurate than the OEM tolerance. While I haven't personally used one of them, their company reputation is quite good, as is the quality of their harnesses. You might want to check it out:

http://www.lectriclimited.com/mainpage.htm