fan control sender
Thread Starter
Pro
Joined: Feb 2006
Posts: 671
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2021 C4 of the Year - Unmodified Finalist
fan control sender
Howdy kids. 87 coupe. trying to find a cooling fan controller unit that scews into the head. Ideally i want to find one in 185/175 range. When search on line I type in coolant sensor and all I get are returns for the unit the sends the info to the dash display, not a unti that grounds the fan relay. Any help appreciated.
Phatty
Phatty
Melting Slicks
Joined: Aug 2011
Posts: 2,844
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Just search 3/8 not switch and summit, jegs, speedway, amazon, ebay all have them. Example
https://www.speedwaymotors.com/Coolant-Temperature-Switch-185-On-165-Off-3-8-Inch-NPT,539365.html?utm_matchtype={match_typ e}&msclkid=5fc085da2f4f179ccd3aed45e9763 8ec&utm_source=bing&utm_medium=cpc&utm_c ampaign=SMI%20-%20Shopping%20only%20Speedway%20(Brand)& utm_term=4576992037015195&utm_content=Al l%20Speedway%20Motors%20Products
https://www.speedwaymotors.com/Coolant-Temperature-Switch-185-On-165-Off-3-8-Inch-NPT,539365.html?utm_matchtype={match_typ e}&msclkid=5fc085da2f4f179ccd3aed45e9763 8ec&utm_source=bing&utm_medium=cpc&utm_c ampaign=SMI%20-%20Shopping%20only%20Speedway%20(Brand)& utm_term=4576992037015195&utm_content=Al l%20Speedway%20Motors%20Products
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 249
From: Summerland B.C. Canada
If your planning to tie the switch into main fan, that temp range is OK.
If your planning to have that switch for the booster fan, you may find it annoying to hear that fan all the time.
I am basing this off my loud annoying booster fan.😆
If your planning to have that switch for the booster fan, you may find it annoying to hear that fan all the time.
I am basing this off my loud annoying booster fan.😆
Drifting
Joined: Jul 2022
Posts: 1,805
Likes: 365
From: Central Florida
https://www.corvetteforum.com/forums...on-switch.html
I ended up going with the TS 136. I usually travel the back roads and traffic hasn't been bad here lately. Even in light traffic through town I have yet to turn any fan on this summer in my 87 Z52. I usually do my rides in the summer very early in the morning. I needed a new AC condensor so I just deleted the old one. My cooling system is renewed though, new radiator, deleted oil cooler, deleted AC condensor, new water pump, new 185 thermostat and my timing is BTDC 6°. As best my ECM temp gauge and a temp gun can tell my TS 136 turns on at 220°. I personally believe these switches very by a few degrees from one to another. The SW 505 was another choice, I still haven't found the new one I bought, dammit, it's here somewhere. I cruise in 90 degree daytime temps at 187°. The link above is to Greg's @GREGGPENN original thread about fan switchs.
I ended up going with the TS 136. I usually travel the back roads and traffic hasn't been bad here lately. Even in light traffic through town I have yet to turn any fan on this summer in my 87 Z52. I usually do my rides in the summer very early in the morning. I needed a new AC condensor so I just deleted the old one. My cooling system is renewed though, new radiator, deleted oil cooler, deleted AC condensor, new water pump, new 185 thermostat and my timing is BTDC 6°. As best my ECM temp gauge and a temp gun can tell my TS 136 turns on at 220°. I personally believe these switches very by a few degrees from one to another. The SW 505 was another choice, I still haven't found the new one I bought, dammit, it's here somewhere. I cruise in 90 degree daytime temps at 187°. The link above is to Greg's @GREGGPENN original thread about fan switchs.
Last edited by Vets-Vet; Aug 16, 2025 at 08:50 AM.
Thread Starter
Pro
Joined: Feb 2006
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2021 C4 of the Year - Unmodified Finalist
Thanks for the help kids MUCH APPRECIATED believe me! I found the exact piece I want from a Corvette Central vid on YT but their website doesn't seem to work,,,,are they still in business? thanks.
Pro
Joined: Aug 2023
Posts: 524
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From: CenTex
I have used this one for over a year, no issues at all in the 200/185 range, I recently switched to the 185/175 and feel it is too low. My car tends to run between 185 and 200 which is perfect for the 200/185 as the fan is off on the highway (unless the A/C is on) and comes on when stopped as soon as the temp reaches 200. With the 185/175 the fan does not stop, at least on my car.
This is in your desired temp range.
This is in your desired temp range.
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Verdad Gallardo
Race Director
Joined: Nov 2003
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From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
I have used this one for over a year, no issues at all in the 200/185 range, I recently switched to the 185/175 and feel it is too low. My car tends to run between 185 and 200 which is perfect for the 200/185 as the fan is off on the highway (unless the A/C is on) and comes on when stopped as soon as the temp reaches 200. With the 185/175 the fan does not stop, at least on my car.
This is in your desired temp range.
https://www.amazon.com/dp/B092M9QWFY...fed_asin_title
This is in your desired temp range.
https://www.amazon.com/dp/B092M9QWFY...fed_asin_title
Phat, don't pick anything that turns on below 200 and off below 185. Keep in mind the dash display's sensor is high up in the engine meaning it's going to show a bit hotter than the ECM sees....up to 10-deg in reality.
GIVE YOURSELF A BREAK AND LET YOUR CAR BE ABLE TO RUN LONG STRETCHES WITHOUT THE FAN RUNNING!!!!!!!!!!!!