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Outside temperature display wrong

Reads -40 always

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2 Answers

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

1 Answer

Temperature display isn't accurate


Hi Dale. Look under the front bumper either on the left or right trim panel. The trim panels are triangle in shape. An outside temp sensor usually sits in this area. The sensor may be missing. BMW has the sensor, wire, and connector available sperately if they are missing or damaged. It will cause the outside reading to be -40 and can cause the a/c compressor not to operate.

Feb 29, 2012 | 2000 BMW 3 Series

1 Answer

Outside temperature display is widely inaccurate.


Change heater output temperature sensor.That is a SAAB dealer job.

Apr 22, 2010 | Saab 9 5 Cars & Trucks

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Air conditioner suddenly stopped working and my outside temp on dash reads at ( - 40 )ever since.heater works fine


the sensor that reads the outside temperature may be the problem.The computer will not turn on the a/c if it is 40 below outside.

Apr 14, 2010 | 2008 BMW 528i Sedan

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

1 Answer

2000 bmw 323i always displays -40 degrees


You ripped out your outside temperature sensor, it's located by the  right brake duct area.

Jun 28, 2009 | 1999 BMW 323 Series

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

Outside temperature Gauge


disconected wire or blown fuse to the outside thermostat

Feb 26, 2009 | 2003 Volkswagen Beetle TDI

1 Answer

Outside temperature thermometer on 2005 Ford Freestar van


my thermometer is blinking -40 degrees how can i fix this

Jan 19, 2009 | 2006 Ford Freestar

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