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Based on your description, it seems like there could be a few possible causes for the issue. Here are some things you can try:
Reset the climate control system: Try resetting the climate control system by turning off the engine, pressing and holding the A/C and recirculation buttons at the same time, turning the ignition to the ON position without starting the engine, continuing to hold the A/C and recirculation buttons for 10 seconds, releasing the buttons, turning the ignition key to the OFF position, and starting the engine.
Check the blower motor: If the fan is only working at one speed, it could be due to a faulty blower motor. You can check the blower motor by turning on the fan and checking if it's blowing air at all speeds. If it's not, then it could be due to a blown fuse, bad relay, resistor or control module malfunction, or a bad electrical connector or broken wire.
Check the HVAC control unit: If resetting the climate control system and checking the blower motor doesn't work, then it could be due to a malfunctioning HVAC control unit. In this case, it's best to take your vehicle to a certified mechanic for further diagnosis and repair .
Well you need to post more info. What mode is the climate control in? what is the temp set to? Is the engine warmed up to operating temp? Is the coolant filled to the top of radiator and are the hoses going to the heater warm/hot when engine is running?
Automatic climate control? The HVAC control module is the part with the buttons that control the heater in the dash.
The first thing I would do is access the blower motor. With key on and/or the engine running wiggle the connector at the blower motor. It you get the same symptom than replace the blower motor. I run into quite a few of these with this symptom.
unfortunately the climate control system in your car is totally electronic. the outsidetemperature system is related to the other problems, most likely there is a problem with the climate control computer, but it could be many things in the system that has gone haywire, there is not any thing you can do to the system with out a scan tool, you might be able to go to autozone and see if they can retrieve the trouble codes from the climate control computer. but not all autozone's can get info from Mercedes-Benz they are kind of a breed of there own, good reliable cars but very difficult to work on and Mercedes very reluctant to give any info on theircomputer systems to anyone other then there certified dealers.and if you are not very careful with the electronics you can do even more damage they are very sensitive to staticelectricity.i would not recommend trying to repair the system yourself......sorry
for the transmission I would check the fluid level and add fluid, the climate control may be a fuse or the switch, you will need to check the fuses inside and under the hood as it may be located in the two, to check control switch mark wires and take out and inspect switch. Hope this helped Tim
You may want to check the engine to boy gounf . It is located at the rear top of engine anfd is bolted to the engine intake manifold and screwed to the firwall. It's just a short stainless steel braided strap Remove ,clen rnds and sand of any pat tthat would interfere with a good connection. Good Luck _Ned_
Could be a number of things, usually a blinking screen indicates that the climate control module is defective. But not always, If one of the vent doors jammed of a solenoid for one of the doors malfunctioned It would cause the screen to flash.
if you are sure that your heater core is not restricted. then try to recalibrate the climate control panel. if your a/c system is not working then DO NOT ATTEMPT THE RECALIBRATION it will make your lights on climate control panel flash codes forever.
to reclaibrate the climate control panel just have the engine running. turn the mode to vent, the temp to cold, the blower on high, then press and hold the rear wiper wash and wiper buttons at the same time until the panel lights up then wait about 2 minutes for it to run completly when completed. turn off ignition and then restart the engine try to se if you have heat again. if it doesntwork post the codes it gives you after the calibration test.
Electronics involved !
The climate control seat system is able to heat and cool the front seats. Each climate controlled seat is operated by push-buttons on the dual automatic temperature controller (EATC) located on the instrument panel. Each front seat temperature is then monitored and controlled by the dual climate control seat module (dual CCSM) located underneath the passenger front seat cushion.
Both the driver and front passenger climate controlled seats are independently controlled electronically by the dual climate controlled seat module (CCSM) mounted to the bottom of the passenger seat cushion. The climate controlled seat system only operates with the engine running, however, if using a diagnostic tool to command the dual CCSM, diagnostic testing can be carried out with the ignition switch key ON engine OFF (KOEO). The system receives power from central junction box (CJB) fuse 118 (30A) through circuit 1153 (RD/BK) feeding battery voltage into dual CCSM C3265b pins 1 and 24. If power is disconnected from either pin 1 or 24 of dual CCSM C3265b, only 1 seat will be disabled (pin 1 for driver seat, pin 24 for passenger seat), the other will remain operational. Since both climate controlled seats operate independently, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled by the module and the other will remain operational.
Sorry , but it would be best for you to take it to the dealer or someother qualified repair shop.
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