Where to install coolant temp sensor?
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Senior User
Joined: Feb 2017
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Where to install coolant temp sensor?
7.3 engine. Can anyone suggest where to install a coolant temp sensor? When I installed my Edge CTS2 monitor I added a coolant temp sensor to the coolant filter housing but I really think its way off, as in reading 20+ deg cooler than actual coolant temp in the engine.
Where are others installing the coolant temp sensor for a CTS or for a gage?
Where are others installing the coolant temp sensor for a CTS or for a gage?
Mountain Pass
Joined: Mar 2010
Posts: 113
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I installed my sending unit in one of the plug ports of my water pump. I installed an aftermarket water pump in my Ford Excursion 7.3 and it had a plug to remove so yours may be different. My Isspro gauge reads consistent with where it should based on my Motorcraft thermostat which I installed 2 months ago.
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That's where I have mine currently but its reading 155 deg which I know is not right. Oil temp is 200 or so and thermostat is 195. Perhaps the single wire sensor that the Edge uses is not properly grounded on that filter housing and is reading incorrectly. I am going to try and ground it better and see if that helps. If not I will move it to the engine somewhere. Since the engine computer does not read water temp there is nothing other than the dash gage to compare to. That one is squarely in the middle of the scale.
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Postmaster
Joined: Nov 2015
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From: Colorado Springs
That's where I have mine currently but its reading 155 deg which I know is not right. Oil temp is 200 or so and thermostat is 195. Perhaps the single wire sensor that the Edge uses is not properly grounded on that filter housing and is reading incorrectly. I am going to try and ground it better and see if that helps. If not I will move it to the engine somewhere. Since the engine computer does not read water temp there is nothing other than the dash gage to compare to. That one is squarely in the middle of the scale.
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Senior User
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Thanks. Yes they are open and flowing. I can see the flow dumping into the expansion bottle. The filter base is also hot.
Postmaster
Joined: Nov 2015
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From: Colorado Springs
Well, and thenmy guess is your sensor is bad. Pull it out and put in a glass of cold water does it read it correctly?
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Trouble is, it will not read anything in a glass of water as there is no ground path. Its a single wire sensor and I think that may be my problem with the coolant filter mounted to the radiator support. Time to do some electrical testing and or grounding I think.
Fleet Mechanic
Joined: Jun 2015
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I got the T fitting at Home Depot. Standard 3/8" npt fitting. The sender came with the isspro gauge. You can pick it up at dieselmanor.com. I feel like this is the best way to monitor coolant temps as there is a steady flow of coolant always being pushed across the sender.