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Coolant temp sensor? Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Car Troubleshooting Rayderz New User Jun 22, 2018, 1:29 PM Post #1 of 4 (1513 views) Coolant temp sensor? Sign In The Mrs said her 2003 Chevy Tahoe Z71 5.3L engine was running warm. I told her I'd check it later. 3 days before I looked at it. Upon starting it, dash gauge was reading 225 degress ish. So I instantly thought coolant temp sensor. Ran down to store and bought a new one. Disconnected the lead to the old one (still screwed into engine block) and connected the new one. It's now just hanging free in engine compartment, and I turned key on again to see what gauge says, hoping it would read zero. Still showing just right of center. Now what? Sidom Veteran / Moderator Jun 22, 2018, 2:11 PM Post #2 of 4 (1507 views) Re: Coolant temp sensor? Sign In When you disconnect the sensor, the reading defaults to -44°, if the needle didn't move when you disconnect the sensor more than likely you have a gauge problem... The clusters from that time period had lots of problems with all the gauges....The only way I know to confirm this is to sweep the gauges with a scan tool (move the gauges from the lowest point to highest & back).... if someone else has another test....I'm sure they will post it.... Tom Greenleaf Ultimate Carjunky / Moderator Jun 22, 2018, 2:49 PM Post #3 of 4 (1501 views) Re: Coolant temp sensor? Sign In ? Unplugging it didn't change reading on dash? A or B - It's not that more likely some other or oil pressure gauge which one dropped out? Trucks dag nabbit could have "extra cooling" package you need to know and at least have the right gauge sender. If you are electric fan(s) only and a needle for temp (different possible) it may be just fine and come down however hot it is request heat only and disable A/C and also try leaving that and use heat out defroster only. Sidom: Were you thinking a CTS or sender for gauge only? I can't know which set up for each truck just that if only electric fans it might be correct and not stay at one spot only all the time no matter what barring super extremes and if that hot 225 if system is tight isn't near boiling point with a working pressure cap, T Hammer Time Ultimate Carjunky / Moderator Jun 22, 2018, 3:23 PM Post #4 of 4 (1493 views) Re: Coolant temp sensor? Sign In You need to also remember, coolant temp sensors read coolant, not air. You can't just plug it in outside the engine and expect a reading. It does sound like you have a gauge problem though. You really need a scan tool to see the actual temp the computer is seeing. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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