Question about 1999 BMW 323 Series

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Temp my temp reading on my dash always says -40 degrees how do you reset it

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This reading is a default setting and it looks like the ambient temp sensor is either faulty or missing, it should be located in the front lower plastic panels under the front bumper. hope this is of some help and if the sensor is missing/damaged you will not be able to reset it

Posted on Jan 23, 2009

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I replaced my temp sensoe and it reads ccd


Hi Glenn, I'm glad to help! Here's how you check the Ambient Temp Sensor circuit itself to see if its working properly. Disconnect the Ambient Temp Sensor Connector. If the temp reading go to the default mode it will show 40 degrees. If it doesn't go to 40 Degrees then thyere something wrong with the system. Could be wiring or display itself. If it does go to 40 degrees then I'd try another sensor and see what happens. Hope this helps and have an awesome day Glenn.

Apr 11, 2014 | 2001 Dodge Ram 2500 Truck

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Outdoor thermometer reads -40 so the climate control system blows heat in the summer


sound like faulty out side air temperature sensor located center radiator support.

May 20, 2013 | 2001 Chrysler Town & Country

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2001 Saturn L200 Sedan, 186,000+ miles. When first try to start it cold, engine stumbles and sometimes won't run--like its short of fuel or lacking spark. Try again and she starts fine and runs great...


You can read what the ECTS is telling your computer with a scanner. (It will read in degrees) If this is bad, sometimes it will read -40 degrees and cause the system to add more fuel, which may be you issue. Also, you can ohm out your spark plug wires to verify if they are all equal.

Jun 23, 2011 | Saturn L-Series Cars & Trucks

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Hi I bought a 2006 Ford Explorer it has a outside temp. readout on the dash board. The temp is off by 15 degrees higher. What can I do to fix it?


if it is reading wrong al the time , replace the sensor. if reads off after car is driven sensor might have been moved to a spot near something warm and needs to be put back

Apr 13, 2010 | 2006 Ford Explorer

1 Answer

Air conditioner clutch will not engage. also my car has auto climate control and the external temp. light always reads 30 degrees.


That is why the A/C clutch is not coming on.If the temp is below 50 degrees the auto control will not allow the compressor to kick in to protect the compressor.You have to check the codes for the body control module.It should show a code for the outside temp sensor.You could have a bad sensor or wiring.If you disconnect it it should show -40 degrees.check wiring and connections.Hope this helps.Good luck.

Apr 05, 2010 | 1999 Buick Regal

1 Answer

Replaced a 03 monte outside temp guage sensor only reads -40 now


If there is nothing else wrong with the system you just need to drive it over 25mph for more than 2 minutes. If you slow down below 25mph then you will have to start over. I would recomend getting on the freeway. Don't go over 60mph though, that will make it reset also. If it still says -40 after you are sure you have met the time and speed criteria. Then there is still a problem in the system. Make sure the connector at the temp sensor is clean and the terminals are good.

Oct 13, 2009 | 2006 Chevrolet Monte Carlo

2 Answers

Misreading outside temperature sensor on 2001 Audi A4


There are four sensors for ambient tempurature and they work in unison to provide information to the temp reading on the dash, the heater control head ( where to direct air, blending of warm/cold/outside/inside air flapper controls) depending on the ambient temp and the inside air temp sensor located just above the radio as well as the sun sensor on the top of the dash as well as the a/c compressor head.

When you start your car, the body control module takes the readings from all sensors, outside air temp located in front of the radiator, air temp sensor located in the airbox ( senses temp of air being drawn in from the outside into the air box), coolant temp, inside air temp sensor and the sun sensor on top of the dash (this is why it takes a few seconds for the climate control system to begine when you start the car). The intake air sensor is 1st priority, inside air second, coolant third, ambient 4th and sun 5th. For instance, if the sun sensor reads the sun is hot but the interior sensor reads cold, the inside akes priority. The goal is for the system to achieve a tempurature inside the car that matches the selected temp. It uses all of the sensors to set the system up to achieve that goal as quickly as possible.

Example; Its mid afternoon, sunny and 40 degrees outside adn your in stop and go traffic. The intake sensor reads 40 degrees, the outside sensor reads 60 degrees (heat from radiator...engine heat protrudes into cabin) and the sun sensor reads high (sun is strong). The system is set for 72. priority one sensor reads 40, inside sensor reads 65, ambient reads 60= system will blow hot air to the floor out put, dash outlets will lightly flow 65 degree air so the sun doesnt roast you yet your feet are cold(if it blew hot air from all outlets, your upper body would be hot but your legs/feet would be cold). as the interior sensor reaches desired temp, air will be distrubuted through thee dash, defrost and floor with the warmest air coming out the floor and defrost, coolest air out the dash vents. Its a complex system!

The two sensors that will screw the system up the most are the intake and interior sensors. the system will function reasonably well with just those two sensors though it wont blend air temps between outlets if the sun sensor isnt working. If the outside sensor fails, it simply uses the intake sensor, if the intake sensor fails it will rely on the front sensor. However, since the intake takes priority over the outside sensor, if the intake sensor sends incorrect resistance info rather than failing, it will take priority and cause the unit to malfunction such as in your case.

The intake air sensor can be changed from the outside with patience. If it where me, I would pay the two hrs labor and let the dealer do it right.

Kevin,
Kevins Small Engine service,
South Berwick ME. 03908

May 01, 2009 | 2001 Audi A4

1 Answer

Gage reads 10-50 degrees below actual tempiture


The needle on the dash gage can be pulled off and slipped back onto the stem of the gage. First get an accurate temp gage to be sure what the engine temp is operating at. Then remove the face of the dash gages and remove the needle and place it back onto the stem to reflect the current correct engine temp and you should be good.

Mar 11, 2009 | 2001 Ford F150 Styleside SuperCrew

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