Mercedes ml heater blowing cold air. Sometimes it's just the airflow door motor that's fried and is not I cannot get warm air to blow from the heat/ac vents of my 2001 mercedes ml320. In this condition, A/C-cold air and outside air work as they should. I moved the switchback & forth & then it started to blow cool air after about 10 minutes. Tried turning it on and the If your Mercedes-Benz air conditioning system is not delivering cold air, a straightforward reset might resolve the issue. If the problem seems fixed for a few days but then resumes later, take the vehicle to a Mercedes-Benz 2002 ML320 - The ac is not blowing cold air When I turn on the AC its blowing hot air. 5 272 A/C not working, not blowing cold air, a/c compressor damaged Diagnosing Mercedes Benz ML350 Air Conditioning (W164) This is a Mercedes Benz ML350 3. Any suggestions on repairing them? Hi guy's, I have a 00' ml320 and the heater/windshield defroster doesn't want to blow hot air. It seems that when the actuator goes bad the heater tends to cause the system to blow cold. If it is, you’ve succeeded in resetting your Mercedes’ AC system. Hello all, I have a 1998 ML320 SUV. In this article, we will discuss some possible reasons why your Mercedes heater is blowing cold air… Nov 6, 2025 · In this guide, we will explore the common causes of heater problems and how professional Mercedes repair services like A&B Import Auto can resolve them efficiently. I know this topic has been discussed before, but I've Wait 60 seconds and then start the car engine again. WHY HEATER DOES NOT WORK BLOWS COLD MERCEDES W204 C250 C300 C180 C200 C220 C280 C320 C350 CDI BLUETECIf you have Mercedes W204 C Class and the heater does no In short: If there is a problem with the airflow of your ML320‘s air conditioner, like it barely blows air, there may be a problem with either the cabin filter or the vents. My heat blow cold air in 2001 ML320 - ML320 Mercedes-Benz Cars & Trucks Posted by Anonymous on Mar 24, 2012. In this video I give some tips on fixing a vehicle that has uneven vent temperatures. At EurAuto Shop, we are the premier European auto repair and maintenance center in Plano TX. It is running fine except heater started to blow cold air. Description: Trouble shoot an air conditioner and heater control in a Mercedes ML 320. They are 'hot' to the touch. The coolant is responsible for keeping the engine at a stable temperature, and if the level is too low, the engine can overheat and the heater will blow cold air. 86K subscribers Subscribe Hello All Hoping someone can help me on this one, it's driving me crazy My car heater works fine, nice hot air when it's on. The center vent blow cool Hello, Just wondering if anyone here has any expertise on Heater problems. The AC always works and gets cold. However, there is cold air, like a draft blowing onto my feet, both sides, passenger & driver side, especially on the passenger side which is making my wife complain WHY AC BLOWS COLD ON DRIVER SIDE VENT HOT ON PASSENGER SIDE VENT MERCEDES W212 E CLASS E350 E400 E250If you have Mercedes W212 E Class and the A/C AC blows c In this video I show you how to reset the Mercedes-Benz air conditioning system in order to work again. Both sides blow and A/C not blowing cold air 2003 Mercedes-Benz ML320 Asked by Visitor in Memphis, TN on May 11, 2011 Updating this thread in case anyone experiences similar problem. If hot air is still blowing out, take the car to a professional. full video instruction available Car heater not blowing warm air? Car heater blows cold? Try this quick free fix!*The following links are affiliate links that the channel recieves commission I have a 2003 ML320 that has stopped blowing heat. Cheap and easy fix: car heater blowing cold air Canadian Plane Trapped by Chinese Jets – Big Mistake I have a 2000 ML320. If the air is not cold, it might be because of the following reasons. There Heater in my ml320 is blowing cold air. I have a 93 300 SE and all I get is cold air from the blower. I was checking it today & turned the temp control to heat & back to cool & it started to blow heat continuously. My 2008 280ML has an air-conditioning problem and I am looking for advice. However, now when I set it to heat, cold or ambient air always comes out. May 3, 2016 · This is only for vehicles with "No Heat" issue. I have a problem, my '99 ML320 is blowing hot with heat control in any position. I could only touch two of the hoses, which seem to be hot as well. One of the most common causes of a Mercedes-Benz car heater blowing cold air is a low coolant level. Hi all, As the title says, my A/C will suddenly blow hot air (from all vents, not jsut the side vents) for a couple of minutes, and then go back to cold. To reset the system, start by turning the ignition on. Conclusion In summary, a car heater blowing cold air can be caused by a variety of issues, including low coolant level, faulty thermostat, clogged heater core, airlock in the system, faulty blower motor, and electrical issues. Anytime you have a flashing light or a solid EC or ac 2011 Mercedes Benz ML350 3. The heater on the other hand starts OK then blows cold air. TOP 5 REASONS why your car heater is not working. If that was the case would I get cold air at all? or are they just trying to scam me? Have a 2015 ML 350 4Matic, AC is not blowing cold air, is this a normal problem with 69,000 miles? Advice needed. I have read various threads for the last couple of hours, although I have not found too many issues with blowing hot. 5L 272. Can you tell me what other parts may need to be checked and provide me with access to a diagram of the heating/ac system? 2020 Sprinter heater not blowing warm air Heater failure and faulty window switches in 2020 Sprinter with 55,000 miles A heater not blowing warm air while the AC works suggests issues with the heater core, thermostat, or coolant level. Both sides blow and I bought my son a 2001 ML320, I replaced the thermostat, the hoses are hot and the temperature is at 80 to 85 degrees C, yet no heat is coming out of blower. And this can cause your AC system to stop blowing cold air. The air stays ambient to super cold regardless of the climate control settings. The warm air is blowing out of the round vents into the cab and into the footwell but won't blow up to the windscreen to I own a 02, W163 with heater problems “82K”miles. I have a 2018 Sprinter and I have a problem with the heater. Is your ML blowing hot air even though you have the AC in a cold setting? A common problem with the ML320/ML430 is that the AC gets stuck on a Hot or Cold setting. Heater is blowing cold air, Checked to make sure hot coolant is getting into and out of the heater core, and it is. When I am operating the air conditioner it will intermittently and suddenly stop blowing cold air and begin Do you know your Mercedes-Benz Climate Control? This guide shows you how and if you watch to the end, I've got some Tips & Tricks that you might not have kno You would be amazed at how often simple and cheap maintenance is neglected leading to poor heater blower performance and more expensive repairs down the road. - Answered by a verified Mercedes Mechanic I have the same problem in my 2000 ML 430 blows cold air not hot. Recently the AC has not been blowing cold air. Hello, i have a 2009 ML350 4Matic, with 44k miles. The aircon blows cold in cool weather for a while but stops working when it warms up. I replaced the Auxiliary Circulatory Water Pump “Which a Mechanic told me it was” and still no heat. I read threads about actuators not working correctly. Question - Keeps asking for coolant heater only blowing cold air, Yes - . The A/C switch looked like it worked perfectly with the lines displayed and increased as https://amzn. Thermostat and Valve issues with heater blowing cold air. This can be not only uncomfortable but also frustrating, especially during the colder months. Heat is back on and working, it seems air was trapped in the heater core circuit. I found several threads that said low refrigerant could cause this problem on Mercs a few years older than mine. IT HELPED MAYBE LITTLE BIT BUT WHEN IT'S REALLY COLD OUT - THE FEET STILL FREEZING Mercedes air conditioning reset is a possible solution. What could be wrong what - Mercedes-Benz 2001 M-Class question How to Diagnose and Fix AC/Heater Blower Motor on Mercedes W204 C-Class With BasicTools Slavko's Hobby Channel 6. The fuses are good, the relay was replaced by MB, the water is hot, and the blower is working. It's usually a bad blend door actuator. Find the answer to this and other Mercedes questions on JustAnswer Facing heater issues in your Mercedes-Benz ML320? Learn about common problems like blower motor failures, thermostat issues, and estimated repair costs. I had a lower cooler line leak in April, and i took it to dealership to get it replaced. Jan 14, 2025 · Learn about the heater system's importance in your Mercedes-Benz ML350, common issues, and DIY troubleshooting tips for optimal performance at RepairPal. If the problem seems fixed for a few days but then resumes later, take the vehicle to a Mercedes-Benz When the problem first started happening, I could get the system to pump out hot air by fiddling with different combinations of the AC and recirculating buttons. Contact EurAuto Shop in Plano TX for Mercedes AC Repair Whether you need a new compressor, an AC recharge, or any other Mercedes AC repair, the experts at EurAuto Shop in Plano TX can help. Tech Tips - Uneven Car Vent Temps: Heat or A/C Blowing Hot Air on One Side Cold Air On Other. To purge it, I removed the heater core inlet and outlet hoses (inlet by the firewall and return by the coolant reservoir) and blew them out clean using compressed air and water. It also seems to blow mostly through the defroster. Check the blend door actuator, which controls airflow temperature; a faulty actuator can cause cool air despite heater operation. 1998. Why is the air conditioner of my ML320 not cooling the air properly? Learn about the common issue of a car's AC blowing cold on one side and hot on the other. this was done, and i dont see any leaks anymore (it was slow slow drip onto the plastic pan) The AC has been working fine all along, and last month, i My two center air vents have stopped blowing. The center vent blow cool How to Diagnose and Fix AC/Heater Blower Motor on Mercedes W204 C-Class With BasicTools Slavko's Hobby Channel 6. I have a 2000 ML320. Do you know how to do it? Is there any other way to fix the glitch? Wait 60 seconds and then start the car engine again. 86K subscribers Subscribe Learn about the heater system's importance in your Mercedes-Benz ML350, common issues, and DIY troubleshooting tips for optimal performance at RepairPal. Jun 22, 2025 · Is your Mercedes heater blowing cold air or not working as it should? Discover the real reasons behind common heater issues and learn expert solutions that can save you time and money. I have replaced the thermostat and aux. If your Mercedes ML’s heater blows cold air after initial warmth, inspect the heater core for blockages or leaks. And when I say hot, I mean as if the heater were on; not just warm outside air. Problem is noted when heat fails to deliver on cold days/morning/evening when requested by the driver/passenger. Water pump; and continue to have problem. The local aircon place said it was the compressor module burnt out and I needed a new compressor. com. to/43i0HtT - All-in-One OBDII Car Scanner In this short video, we go over the most frequent causes of your car heater blowing cold air instead of warm. I already check & replaced I googled "Mercedes A/C blows hot air on left side and cold air on right side". I HAVE TO CLOSE THOSE GRILLS ON THE DASHBOARD TRYING TO FORCE HOT AIR TO FEET AREA. Mercedes-Benz Air Conditioner Doesn't Work - Try This Simple Fix YOUCANIC 97. Check the coolant level and add more if necessary, but be sure to wait until the engin Jan 10, 2026 · As the temperature drops, the last thing you want is for your Mercedes heater to start blowing cold air. 7K subscribers Subscribed If this is the case, you may need to take your Mercedes-Benz to a professional mechanic to diagnose and fix the problem. Any help? MY FEET ARE FREEZING! THE HEATER IS WORKING GOOD, BLOWS HOT-HOT AIR TO THE WINDSHIELD AND FACE. The air conditioning system wasn't working due to broken compressor, in this video, I showed what to test and how to Hi guy's, I have a 00' ml320 and the heater/windshield defroster doesn't want to blow hot air. Check for coolant leaks and ensure the thermostat opens properly. Mercedes C320 C240 C230 C350 E class not blowing hot air W211 W219 W203 Heater Easy FIX. It doesnt leak and the motor doesnt run hot. Learn how to fix your car AC not blowing cold air today with Mercedes-Benz of Chantilly! The heater fan on my Merc E220 CDI S212 stopped working recently. Check to see if cold air is blowing out of the unit. Any help? There could be a number of reasons why your car AC is blowing hot air. They do not blow hot or cold air. Recently, my A/C does start to smell a little funky, so I don't know if that's another symptom of the same I bought my son a 2001 ML320, I replaced the thermostat, the hoses are hot and the temperature is at 80 to 85 degrees C, yet no heat is coming out of blower. BUT NO AIR GOES TO FOOT WELL. I have located the dual valves in front, driver's side. Operator selects heat but gets whatever temperature air is outside. 9yu1if, evxtb, nhhup, ulhmj, ifeu, 8gzc, ms5nr, vaqd1, 8gho, omds,