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Search Auto Parts Search OVERHEATING AND FAULTY THERMOSTAT CUASES Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum brandonf New User Sep 27, 2005, 10:24 AM Post #1 of 4 (6240 views) OVERHEATING AND FAULTY THERMOSTAT CUASES Sign In Can anyone help me? The temperature gauge on my 99 Mercury Cougar has been acting erratic lately and I seem to be having problems diagnosing the cause. Sometimes the gauge doesn't move and everything is normal. Other times it will climb into the red zone and stay fixed in that area for quite sometime before releasing and falling back to the dead-center where it normally should be. I've also noticed at times my fans don't run unless the A/C is on. I took it to Midas and they were completely useless and told me they can't diagnose it until something goes wrong. What could be the cause/cure...simply replace the thermostat and see what happens? Is it possible the fan motors are shorting, or could it be a temperature sensor? What is your opinion? Tom Greenleaf Ultimate Carjunky / Moderator Sep 27, 2005, 3:13 PM Post #2 of 4 (6214 views) Re: OVERHEATING AND FAULTY THERMOSTAT CUASES Sign In If things are ok with A/C on then it points to the switch near thermostat that makes fans come on. Cheap and worth a try if that sounds like it. T rsuda User May 27, 2006, 6:32 PM Post #3 of 4 (5500 views) Re: OVERHEATING AND FAULTY THERMOSTAT CUASES Sign In Tom,Just wondering if you know the name of this switch near the thermostat,I'm having the same problem with the rad. fan not working.THANKS!!!!! Tom Greenleaf Ultimate Carjunky / Moderator May 28, 2006, 11:53 AM Post #4 of 4 (5493 views) Re: OVERHEATING AND FAULTY THERMOSTAT CUASES Sign In Un plug the "temp sender" and if the gauge falls that would be a good indicater that you have the right one. If putting A/C on quickly when it spikes drops with the fans running it MAY be that. Do fans always work with A/C on? Is all normal with A/C on? Sorry to answer the question with questions. If the car is truely overheating don't wait to address this and hit back with what you find. T   Email This Post   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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