Well...My last car was a 1968 RT Charger with a dyer blower on it. One radiator fan and no sensor. I had no idea there was a sensor that operated the fans until 3000 dollars later. I am not a mechanic.
Everyone thinks it's first a stuck thermostat. Then they think you have a bad radiator, then a bad water pump...Or you have air in your system...By that time the head gasket blows and you have a crack about the width of a toothpick in the gasket. Now you have major engine repairs. Then my mechanic checks the fans and they work fine. I assume the sensor creates a false reading and turns the fans off when they are needed the most. Both my fans were working fine. The clue was when the car was hot they didn't run like they were suppose too when the engine was turned off and they stay on to cool the engine. I had a dead car battery one morning. Now I know why...the fans / fan never turned off. That was the first sign that the sensor was bad. That I figured out today.
So if you have an Acura and a dead healthy battery in the morning you'll know know what you have to look forward to.
First your car overheats, You don't see the gauge go into red. The engine light comes on...you try and drive it anyway and blow the head gasket and the mechanics don't know about the sensor and replace everything that is not causing the problem. Your bill may be up to 5,000 dollars or a new engine. All you really need to do is replace the sensor because it causes everything to happen. If everyone new this why are there over 100 posts on this site all having the same problem and no one knowing what's causing it?
I know for sure because everything was replaced. With the exception of that sensor. Car overheats still. I change the sensor. Car works great and runs cool all the time. Problem solved Here's a couple of get me home without overheating solutions..... Rev the car a few times and watch the temp go down...Fan turns on. ...Drive it a short distance and it over heats. Or Overheats when it idles. I've had it overheat at 70MPH. Rev it a few times and if the temp doesn't go down pull over and let it cool...Never pop the radiator cap to see if you have water with a hot engine. .It's not a bad gauge problem or a sending unit in my case that measures your engine temperature..If the temp needle goes into the red it may cause future problems with those systems I was told. If your engine warning light comes on turn your engine off immediately as you park off the road. That happened only once to me. I drove the car with the needle moving into red almost 100 times before the gasket blew for good. I just kept on revving the car and the temp went back to normal. The last time it stopped doing that and stayed in the red. Then I knew it was over and I had to have the car repaired.
Turn the air conditioning on to make it home and get the car fixed immediately. The air kicks on the extra fan automatically and doesn't use the sensor. If your car changes RPM from high to low you have a blown head gasket. White smoke out of the exhaust...Same problem.
Last edited by jimmymeyer; 06-04-10 at 10:45 PM.
Reason: Adding more info.