My 2006 Caravan temperature gauge goes to red - engine is not overheating. Kick it into a lower gear (automatic trans) and the gauge comes back down. Is it likely the coolant sensor?

The ac fan only comes on when the ac is on , the engine fan comes on at engine operating temp . few things to check , the radiator core fins are free from rubbish leave or plastic bags , the thermostat is fully open , radiator tubes are blocked with gunk have it flow tested .

dodnt specify vehicle -generic answer -- if fluid level is correct and vehicle in not overheating will need to test sensor circuit and or gauge

Engine Temperature Issue - Please Help! - Mazda 6 Forums : Mazda 6 ...

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Sep 12, 2011 - Join Date: Mar 2006 ... to the gauge) and then after being shut off for 5 minutes, show COLD. ... I'll also confirm, with my AP, that my ECT is around 200 like it normally is. .... VSS, and ECT signals and calculate radiator's heat the radiation ... I noticed my engine temp needle was dipping down and then came ... CEL - Throwing code P0126 (Insufficient Coolant Temperature ...
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Temperature gauge going up and down - CarGurus

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CarGurusAug 20, 2014 - Also as my temperature gage rises but car does not overheat. ... tempneedle gets up towards the red mark while you're driving, then yes, ... i have a 2006Pontiac Grand prix and my temp. goes up to the ... crzgrl637 answered 6 months ago ...the cooling fans won't kick on then you will see gauge over heat.

Car Engine Overheating - Causes and Symptoms of Over ...

where is it located....thermostat

check the circuit to the tem p sender unit by removing the wire at the sender and turning on the ignition touch the wire to the head . The gauge should got o hot. This indicates that the wire is ok . Remove and replace the sender unit as it is shorting out inside and is not showing a resistance. The higher resistance __cold water --the lower the gauge reading. The lower resistance the more current allowed through so the gauge goes up

Actually, by your very description of the symptoms the car IS overheating. The temperature gauge should NEVER be "in the red" as this is too hot for the engine. The "puttering" you describe is the engine laboring to stay running in the overheated condition. This is shortening engine life dramatically. It sounds like you may have a thermostat that is not opening completely, or a cooling fan that is not operating correctly. If a fan problem it could be either the fan motor itself or the coolant temperature sensor that turns the fan on. It is imperative that you get this looked at IMMEDIATELY. The engine on your Cadillac has aluminum heads and they are easily warped or cracked by heat. A third problem you could have is a low coolant level. Never trust the sensors in the overflow bottles. If the coolant in the reservoir gets depleted, then the system develops air pockets which cause overheating and erratic gauge operation. If this is your problem, topping off the reservoir and purging the air in the system should clear things up. Be advised, however, you should also be on the lookout for system leaks if this occurs.

Check the transmission fluid level. Also check the rear differential if your car has one ( I think the 99's were still rear wheel drive) for fluid. If either of these are low, the fact that things are fine indicates that the low fluid level is causing problems. Also, the trans fluid should be a nice pink color. If it isn't then the transmission is not in good shape and should be looked at again by the rebuilder. If the fluid levels are fine, have the rebuilder check the trans again to see if he missed something.

The issue with the temp gauge is entirely separate except if you mean that the car begins to heat up when the shifting problems are occurring. If the temp gauge goes way up then comes down quickly regardless of how the car is being driven, the thermostat may be sticking and should be replaced. If the car is hard to drive and then starts overheating, the transmission may well be defective and causing the engine to work harder than it should.

There should be some relay controlling the electric radiator cooling fans. Usually 2 heat sensors are on the motor, 1 for the dash gauge and the other for the fans.

You are trying to cool the transmission when the truck is in gear. When you go to Park or Neutral, the trans is freewheeling and the engine can also rev up slightly. Both of these actions will help bring down the temperature.

You need to have the electric radiator cooling fans checked. Sometimes they are built with 2 speeds and the high speed may not be switching on.

Also, some engines have a cooling fan clutch which is suppose to grip better when the engine heats up. This function can be checked with a timig light. If the clutch on and the fan clutch slips too much, it will overheat.

For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----

temp gauge goes erratic? http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html

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Temperature gauge keeps fluctuating up and down close to red? http://technoanswers.blogspot.com/2012/01/temperature-gauge-keeps-fluctuating-up.html

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Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
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Temperature gauge does not move and no heat when heater is ON? http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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This details will help.Thanks.

its in the kik down cable its sticking