Question about 1999 Mercedes-Benz E-Class

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EC button on temp console will not go off. therefore the ac will not engage. what could be possible problem?

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Low freon level, bad climate control unit or bad interior or exterior temp sensors.

Posted on May 26, 2010

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1 Answer

Air condition and heat know not working


You need to ensure the engine is running when you are testing the AC or heating systems, as they rely upon a compressor to work the heat pump.

If your engine is on when you are testing this and no different temp air comes out, you should ensure your AC system is properly charged with coolant and that the compressor is engaging and functioning. If not, it will need to be replaced.

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2003 monte carlo AC on off button does not work


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Temp. light comes on when driving, seems to go off when I turn off the air conditioning


There are two possible sources for this; the auxiliary fan is not turning on with the AC and/or the compressor load on the belt (if shared with the water pump) is causing it to slip causing the water pump to lose revs. and water flow.
Have someone turn on the AC while you watch under the hood. You should hear a 'click' as the AC compressor clutch engages and the extra fan should turn on.

Jun 24, 2010 | 2002 Chrysler PT Cruiser

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Ac button flashes after using ac for a while if you shut it off for a while ac works again refrigerant charge correct engine operating temp ok .when ac engages fans operate at low speen never high tried...


It sounds like the expansion valve is closing up,replace it,and the dryer to prevent this from happening again,if this was helpful,please rate,thank you,

Jun 17, 2010 | 2003 Toyota Camry

1 Answer

Ac won't turn on?


Your compressor clutch is not engaged that was why AC is not on. The clutch is controlled by several sensors: coolant temp, refrigerant pressure, compressor speed sensor, evaporator temp sensor... First to make sure your Clutch is working then start tracing back to these other sensors. Look at the compressor, there is a plug of electrical wire on it. One prong is for speed sensor feedback, the others are for power connectors to turn on the clutch. Jump wires to power to clutch to check if it is working. That is just the beginning of AC troubleshooting. Good luck.

Aug 12, 2009 | 2001 Mercedes-Benz S-Class

1 Answer

Hi..I have 90 Celica GT model and I came to Autozone to pickup can of Freon to recharge my ac.. Autozone guy came out to check make sure compressor was working when I push the AC button. It was working...


Did you put freon in the car? If you did, and you have too much, there is a "high-pressure" cut off switch, and there is also a "low-pressure" cut off switch. So, if the freon is too little or too much, the AC is prevented from engaging. The best thing to do is take it to a guy who has freon pressure gauges; this is the only way to tell if the charge is correct or not.

Jul 16, 2009 | 1990 Toyota Celica

1 Answer

Ac problem, passenger side is cold driver's side is not.


Hello, Here is a way to ck the codes in the climate control system.
Ignition ON
Temperature selector Left Hi Right Low
Within 20 seconds, press REST and EC simultaneously for more than 5 seconds
The LED in the car flashes and the display di A
Press auto repeatedly until all DTC's are shown. Record all DTC's
Each malfunction (short circuit, open circuit, etc) has a specific DTC
The letter "E" (error) is displayed in the left of the display and the DTC is displayed in the right of the display. By pressing the AUTO button the next DTC stored in memory will be displayed
To erase, This is only possible after all DTC's are read out
Simultaneously press both AUTO buttons for more than 2 seconds
"d" will be displayed on the left side of the display window and "FF" on the right side
The only problems that I can think of that will cause this problem are as follows;
006 right heater core temp
020 right duo valve
I hop this helps. CYA Gator241

Jan 03, 2009 | 1998 Mercedes-Benz E-Class

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