Mercedes e320 heater blowing cold. my blowers are working...

Mercedes e320 heater blowing cold. my blowers are working great but it feels like the ac is always on. It only blows cold air and i have changed the heater shut off Mechanic's Assistant chat Customer: I own a 2003 e320, and the heater isn't blowing hot air. However, many owners encounter Mercedes heater issues that can leave them shivering on cold mornings or struggling to defrost their windows. Any ideas? Douvalve is my guess Thanks in advance Mercedes-Benz Air Conditioner Doesn't Work - Try This Simple Fix YOUCANIC 97. After the heater on my E/class 2003 W211 has just decide to blow cold constantly, I have Googled the fault, and the suggestions all point to the Duo Valve! Looks a fiddly job to replace, but the confusing thing is that several people are suggesting that if you give it a Whack, that it This article applies to the Mercedes-Benz C-Class and C-Class AMG (2007-2014). The heat wouldn’t come on and was only blowing cold air, so I took it to a local Here are some possible answers: http://repairpal. I read threads about actuators not working correctly. About 3 weeks ago, I had a low Looking at the W210 air hoses Êàòàëîã I assume it would not blow hot air but instead would not blow at all on the driver's side when it gets hot? A/C normally blows mainly from the upper nozzles, cool air goes downwards anyway. I have a 2004 mercedes e320 that blows cold air when i turn on the heater. Mercedes-Benz W211 models are equipped with a climate control system or HVAC, which automatically controls cabin temperature once a temperature is set on the 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 Typically cold air will blow from the passenger side and warm air will blow from the driver side. I already check & replaced i have absolutlely no heat. Wait 60 seconds and then start the car engine again. Open the hood by pulling the hood release under the dashboard. I am just wondering if this is an obvious cause of the problem before I take it to the shop. This is a job best left to a mechanic, as it requires specialized equipment. Let's say there is one incoming hose to it, 2 pipes to heater core, and Hi everyone, I am new to the forum . please help my kids cant drive in this beauty,and thats a $40000 shame. A couple days ago a mechanic my daughter knows put a scanner on it and it says it's the Heat exchanger shut off motor. 8M I have a 2003 E320 and the heat stopped working out of nowhere it just blows cool air. Not sure how to fix, any suggestions or similar problems. Jan 14, 2025 · Explore the essential heater system in the Mercedes-Benz E320, common malfunction causes, and troubleshooting tips for optimal cabin comfort. Low coolant level or air in the cooling system can cause the heater to stop working properly in E-Class. It only emits cold air, and I've already replaced the heater shut-off valve, but the issue persists. Understanding the common causes of heater problems is the first step toward restoring If your 2003 E320 heater blows cold air, check the auxiliary water pump function first. I have Mercedes E320 2004 The heater isn't working. What else might be causing this problem? The heater fan on my Merc E220 CDI S212 stopped working recently. I googled "Mercedes A/C blows hot air on left side and cold air on right side". :eek: To me, if it had a leak, then the ac So I have a 1998 S320, When I turn on the windshield defroster after the car is warn it blows hot air to the front windshield for maybe 5 seconds, afterwards it just blows cold. In April I purchased a MB 2003 E320. Just noticed that the air is blowing out cold from the passenger side vents but blowing out warn from Driver’s side vents. The heater wont blow out warm air even though the 4-zone temp is set to 24 Thanks When a 2003 E320 blows only cold air, check the thermostat first; a stuck-open thermostat prevents engine warming. Hi folks, heater on my W211 kept blowing cold air even when settings were at max heat. . Hi All. The heating system in E-Class uses hot coolant or antifreeze from the engine block to heat the interior of th Jun 22, 2025 · Mercedes Heater Issues: Causes, Diagnosis & Solutions Guide When the temperature drops, a fully functioning heater is essential for comfort and safety in your Mercedes. I even tried the Manuel mode instead of climate control but same problem. Many thanks Fred Save Share Reply Quote Like Post Reply Mercedes-Benz Forum posts 7. Nov 6, 2025 · A fully functioning heater in your Mercedes is essential for comfort, safety, and visibility during colder months. I have a 93 300 SE and all I get is cold air from the blower. I tried the reset and what a difference, it is now blowing cold on both side but the passenger side is one or two degree colder you can feel the difference if you put your hand near the vents. Learn about this problem, why it occurs, and how to fix it. the car blows freezing air at all temps. does anyone have any suggestions before i take this 03 e500 in for service AGAIN. And when I say hot, I mean as if the heater were on; not just warm outside air. Final Thoughts If your Mercedes-Benz car heater is blowing cold air, there’s no need to panic. Just tried the heater through all its settings hot, cold, manual, auto, aircon on/off, residual heat, both zones, still getting nothing but cold air, great!! The car has a warranty and i'll be on the phone first thing in the morning but just wondered if its a known fault? I have a 2003 e320 and the heater is not blowing hot. The dealer says it's indicative of a evaporator core having a leak. The heater on the other hand starts OK then blows cold air. :eek At first i though it could be one of the I have a 2007 E350 4 matic Mercedes and the heater blows cold air while dial is on high throughout the time it is on Mechanic's Assistant chat Customer: I have a 2007 E350 4MATIC Mercedes, and the heater consistently blows cold air even when the dial is set to high. I get none from the center vents, and only the slightest whisper from the side and lower vents. May 3, 2016 · Arlind86, Thanks for posting these instructions. What this means is that one side of the car can be cool, while the other side blows warm air and vice-versa. If your Mercedes-Benz air conditioning system is not delivering cold air, a straightforward reset might resolve the issue. Anytime you have a flashing light or a solid EC or ac Mercedes-Benz E-Class – (Gabriel Nica / Shutterstock) The most common causes for AC blowing hot air in Mercedes-Benz E-Class are low or overcharged refrigerant, compressor malfunction, dirty condenser or evaporator coils, faulty blend door actuator, defective evaporator temperature sensor, bad AC pressure sensor, and bad fuse or relay. I got in the car and fiddled with the controls, set them to the max temperature and all and surely, the heater is only blowing cold air. So sometimes it blows hot air sometimes not. BTW, cold air blows out of every vent, and hot air blows out of the side vents. full video instruction available 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. I HAVE A 99 E320 DEISEL. I have been researching it a bit and i read that it could be the Heat exchanger control valve. I put my question at teh Mercedes Benz website form and I received this answers: Mercedes-Benz E320 Evaporator Temperature Sensor Failure - 29 reports. So I thought maybe control were not adjusted properly. I know this topic has been discussed before, but I've I have a 1999 E320 and as the title says, when my heater is on, no hot air comes out of the middle vents and since it's getting colder, I want to fix it fast. If the coolant is adequate, inspect the heater control valve, which is often a common culprit for inadequate heat. The air blows through, but it is as cold as the air outside, no matter what I do to the temperature controls. The A/C switch looked like it worked perfectly with the lines displayed and increased as Mercedes C320 C240 C230 C350 E class not blowing hot air W211 W219 W203 Heater Easy FIX. When it starts underperforming or stops working altogether, it can signal underlying mechanical or electrical issues that need immediate attention. As it got warmer out, both sides started blowing warm. All of this is pretty common knowledge discussed in detail on the MB forums. I have a 99 E300TD that had a problem with outside temperature air Blowing out of the Drivers side VentS, and ice cold air out of the passenger side VentS. I could only touch two of the hoses, which seem to be hot as well. THis is how I solved the problem: Found a 4-way motorised valve right under the brake-servo/master cylinder assembly had ceased, due to corrosion Found 3 result (s) for your search A/c passenger side blow hot and the driver side blow cold for mercedez benz e Mechanic's Assistant chat Customer: The air conditioning on the passenger side is blowing hot air, while the driver side is blowing cold air for a Mercedes-Benz E-Class. my air conditioner is blowing hot air the red light on a/c button is on and cant shut it off. Can anyone advise me on my problem with my 2003 w211 E320 . Understanding why your Mercedes heater is malfunctioning helps you make informed decisions about repairs, preventing further Nov 7, 2024 · Symptoms Mercedes is not blowing hot air. If it is, you’ve succeeded in resetting your Mercedes’ AC system. Mercedes-Benz E320 Failed Digital Heater Control Valve May Cause Poor Heat Output - 15 reports. We always expect our air conditioner to blow cold air and our heaters to blow hot air, but what happens when they are no longer operating as they should? It seems that heaters like to stop working when it's incredibly cold outside or in the middle of a long trip. The Duovalve is used to regulate the amount of engine coolant that flows into the heater core between both sides of the passenger compartment. All seemed to be fine but it was a warm day. Main common problem is heater valve under wipers. When I use the heater, the left side blows hot air like normal, but the passenger side blows cold unheated air. A/C has no hot air Climate control only blows cold air How to replace the Mercedes heater valve What you will need Mercedes heater valve 13 mm socket Screwdrivers Needle Nose Pliers Instructions Park the vehicle and set the parking brakes. I expected that, but there is some non-sense about that. 7K subscribers Subscribed If you are facing a malfunctioning Mercedes-Benz car heater, follow our guide to learn of a number of reasons why this is happening to your car. I have located the dual valves in front, driver's side. There My 2005 e320 cdi is blowing cold air instead of hot when i have heater on. The AC definitely works. I checked if the heater was blowing air but could not determine if it was blowing hot air. It appears that hot coolant is finding its way to the heater coil to spoil my cool summer. Cold air out of Passenger side Vents, Driver side blowing Outside Temp Air!(NOT HOT) SOLVED. It has Troubleshooting Heater Issues in a Mercedes-Benz E350 When troubleshooting heater issues in your Mercedes-Benz E350, start by checking the coolant level, as low coolant can significantly impact heating performance. I found several threads that said low refrigerant could cause this problem on Mercs a few years older than mine. 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. please help its 105 degrees today. My friend suggested that I may have to change the micro In this video I show you how to reset the Mercedes-Benz air conditioning system in order to work again. It is running fine except heater started to blow cold air. That problem, along with a hissing noise from the center vents when the A/C is on, is a common symptom of insufficient refrigerant charge. com/i-have-no-heat-what-could-be-wrong My blower motor sounds nice and loud, but barely any air flows through the vents. Hello, Just wondering if anyone here has any expertise on Heater problems. The climate control system on the W210 Chassis Mercedes has a dual climate system. To reset the system, start by turning the ignition on. The AC always works and gets cold. Check to see if cold air is blowing out of the unit. They are 'hot' to the touch. Heater is not blowing hot air on Mercedes W211, W219 / Problem solved! Replacing valve W211 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 My A/C blows cold air from the center vents and hot air from both side vents. Hi guys, A little headache with blowing cold air on W211 E320. On my '99 E320, the climate cotrol blows so-so cool on the passenger side, but blows warm on the driver side, when set to LO or 14degree temperature. My I had the same problem with the right side blowing cold and the left side blowing warm. By checking the coolant level, thermostat, heater core, heater valve, and cooling system, you can identify the problem and take steps to fix it. I have a 2008 S550 that I recently bought, this was the first time I drove it in the winter cold weather, the heat was always working but after driving to the store I parked the car in the parking lot and the heat suddenly stop working, it was only blowing cold air. If the problem seems fixed for a few days but then resumes later, take the vehicle to a Mercedes-Benz My '07 E320 is doing the same exact thing - cold air on passenger side, warm air on driver side. I thought it may be a duovalve from searching, but that seems related to the A/C. I am hesitant to take it to a dealer until I have a good idea whether or not I can fix this or if it will require a dealer. Quoted me about $4500. 00 to do it. MY A/C BLOWS COLD AIR ON THE TWO CENTER VENTS AND HOT AIR FROM THE TWO SIDE VENTS! WHAT IS MY 1= in car temperature - 25 2= outside temp - 13 3=*heater*core*temp, left - 34 4=*heater core*temp, right - 28 5= evaporator core temp - 14 6= engine coolant temp – 92C 7= refrigerant pressure*- 15 8= refrigerant temp – 56C After switching on the AC, the driving side vents blows warm air which normally takes a while to cool. Sometimes fault would cure it'self till it failed permanently. The problem I have is that ac blows hot/warm/outside temp air initially, then it blows cold air for 1 or 2 min then it blows outside air. I tried everything in the manual, your Hi folks, My wife told me that heater is only blowing cold air. Thermostat and Valve issues with heater blowing cold air. A faulty pump can prevent coolant circulation through the heater core, causing no heat or overheating. Any idea what could be blocking up the whole system? The reading for this sensor sensor 05 for my 1998 C280 was 159 with the car running for 10 min and 158 without starting the car in the morning after a night with outside temp 80. When the driver side is hot, does it blow cold from the centre and the passenger side? On my mothers 2000 E430 she's getting warmer air out of the right half of her vents than the very cold air coming from the right side vents. Air conditioner blows cold air but heater doesnt blow hot air it only blows cold air 2003 Mercedes-Benz E320 Asked by Visitor in Pryor, OK on December 23, 2010 I own a 02, W163 with heater problems “82K”miles. If the cooling system is not full and bled properly, the water pump will not be able to push the coolant around the system efficiently. If hot air is still blowing out, take the car to a professional. Explore essential air conditioning tips for your Mercedes-Benz E320, including common issues, troubleshooting steps, and maintenance advice for optimal performance. Inspect the heater core for clogs or leaks, which block hot coolant flow. zd2p6, fg6ke, rnklc, kzrp, 5u7id, ubbj, c89u8, jatzim, khbq, 2zflnv,