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It sounds like the temp sender may be bad. This is the sensor that sends a signal to the gauge on the dash (as opposed to the engine coolant temperature (ECT) sensor that goes to the ECU instead.) It is located on the bottom front of the thermostat housing (which you will find if you follow the large hose from the top right of the radiator.)
Before replacing, make sure the connection is clean and secure, then check the wiring for any obvious failures.
NEED TO CHECK ON A SCANNER AND SEE WHAT TEMPATURE THE COMPUTER IS SEEING COLD COMPUTER TEMP SENSOR IS MORE THAN LIKLEY GIVING THE COMPUTER THE WRONG TEMP LETS SAY ITS 40 OUTSIDE AND THE TEMP SENSOR IS TELLING THE COMPUTER THAT IT IS 90 OUTSIDE THEN THE COMPUTER WILL NOT GIVE IT THE FUEL THAT IT NEEDS WHEN ITS THAT COLD
I would supect you actually have two problems going on here. First off it sounds like your guage is reading inaccuratly. When it is reading at one quarter it probably should be at the half way point. This is the normal operating range. The most likely cause is the temp sensor for the guage. When you pull a trailer and engine gets under a load the tempature sounds like its going up too high. Your engine light comes on because it uses a different sensor and is registering accurate tempature. I would start by comparing actual tempature of engine with what the guage reads, this can be done with a scanner or a heat gun pointed at the thermostat housing. I believe you will find a faulty sensor or possibly an outside chance of a bad guage.(but doubt it!)Once that is straightned out you will have to look at why is the engine getting too warm under load. I would start with radiator flow,A ristricted radiator either internally or externally will cause this. Good luck!
if your talking about the over head temp reading that is an entirely different system.the temps you show at 178,169,173 are all below what they should be,it should have a 195 degree thermostat in that engine,where did you get those temps,if you got them from the dash you should change the temperature sending unit. re-flashing a computer is done if Chrysler found problems in vehicles and would download the new info to the computer to correct them,
one or more of your actuators is malfuntioning. they ar eunder the dash. I had a mechanic repair mine for about 400 bucks. the dash needs to b removed and some very tight spots to work in. the flashing is maybe caused from the sensor. either outside air tempo sensor or inside. does it blink while showing the inside or ouside. not exactly sure where the inside is, but the outside is in the center in front of radiator when u open the hood. black about the size of a tube of chap stick.
The reason your A/C sent hot and dash showed -40 is because you probably lost your amibent sensor. Its a sensor that reads the tempature outside and if its cold it will not allow your a/c to work, if you force it, you'll cause far more damage then you'd like. You can go to www.bimmerspecialist.com and find an ambient sensor. Also check www.bimmerfest.com to get pictures where your amibent senor is located. Mine was in back of the front / passanger sensor, and it got ripped off as I hit something on the road. Hope this helps...
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