New Temp Gauge and sender now seems higher reading for fans to run.

[Flash66]

Hi all, my temperature gauge bit the dust and after troubleshooting everything and replacing the sending unit, it was definitely the gauge itself. My question is, my fans seem to come on with the new gauge reading 230deg (just above the 220 mark and turn off at around 205-210 (just below the 220 mark. What's puzzling is I could swear the old gauge would read about 190 for the fans to come on and never would reach 220 ever unless the ambient temp was near 100 and above (I live in Vegas). Now I did purchase the new sending unit on eBay which is prompting me to think the resistance value may be different causing a higher reading. I let the car warm up with the cap off and read the coolant temp in the bottle with an infrared therm and I couldn't get a reading from the water in the neck past 195 when the fans came on and down to 188 when they cycles off. So I guess my question is, what do anyone else's gauge read when the fans cycle on and off? Anyone else seem similar? Here's photos of it reading when on and off. I guess I could just order a DMC unit but would like some input from the gang before I go through changing it and maybe still getting the same reading. Thanks!!

Fans cycle on:

https://uploads.tapatalk-cdn.com/20170921/2f7dc9357e99258902a995979dcef8a1.jpg

Fans Cycle off:

https://uploads.tapatalk-cdn.com/20170921/2b2378f54e1c37d8fa54cd00f988574a.jpg

[Bitsyncmaster]

It's probably the sender. Very critical you get the stock unit.

[Flash66]

Thanks for the input Dave! I'll order one and give it a shot. Sure not looking forward to bleeding the cooling system again!

[Bitsyncmaster]

Thanks for the input Dave! I'll order one and give it a shot. Sure not looking forward to bleeding the cooling system again!

I ran a lot of testing of the sensor designing my new electronic otterstat. I had a new sensor I bought close to 10 years ago from Hervey and it tested good. I then got a used sensor from another owner and it also tested good.

Anyway use this table to test your sensor with a multimeter.

212 deg. F = 168 ohms
200 deg. F = 210 ohms
180 deg. F = 297 ohms
160 deg. F = 428 ohms
140 deg. F = 633 ohms
120 deg. F = 965 ohms
100 deg. F = 1489 ohms

My thread is:
http://dmctalk.org/showthread.php?15056-Electronic-Otterstat/page5

Sensor info starts around #45 in that thread.

[Flash66]

Thanks so much for sharing this info Dave! Absolutely incredible research in your thread to have answered any questions I could have to test the theory. Also looking forward to having one of your Electronic Otterstats.

[Nuclearbacon]

Hey Flash! Sorry to hijack, but whats that screen overlay you have on your cluster? Is that a GPS heads-up?

[Flash66]

No worries! Here's a link to the thread of the technology upgrades I made to this car and a YouTube link for a video overview.

https://r.tapatalk.com/shareLink?url=http%3A%2F%2Fdmctalk%2Eorg%2Fshowthr ead%2Ephp%3Ft%3D11745&share_tid=11745&share_fid=24478&share_type=t

http://youtu.be/t6nVO-ITdvs

[Nuclearbacon]

Thank you so much!

[Nuclearbacon]

No worries! Here's a link to the thread of the technology upgrades I made to this car and a YouTube link for a video overview.

https://r.tapatalk.com/shareLink?url=http%3A%2F%2Fdmctalk%2Eorg%2Fshowthr ead%2Ephp%3Ft%3D11745&share_tid=11745&share_fid=24478&share_type=t

http://youtu.be/t6nVO-ITdvs

WOW. Awesome!!!!

[Flash66]

Thanks Bud!

[Flash66]

So, driving the car yesterday, my water pump failed and have coolant pissing out at 6:00 position. Oh the absolute joy of owning a Delorean!