My 1993 190 E Benz will sometimes on its own blow very hot air from the defroster vents and the driverside air vent, the majority of hot air comes from the drivers side and only an small amout of hot air from the passenger side. Doesen't always happen but when you least expect it is cooking you in the face. This happens even when the A/C is in operation or when all ventilation system is inactive. Please help my i'm frying my brain.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
This could be a couple different things. You would need to remove dash to inspect and test these however. First, your vehicle has a blend door which is what mixes hot and cool air together to adjust it to your climate control settings. Your vehicle also have vents which open/close to divert airflow to different locations. If your vehicle also has a setting for fresh/recirculated air 1 or more of these things may not be working properly. It sounds as if your getting warm air radiating inside your passenger compartment because your vents are not closed when your ac/heat is off
I haven't got the problem solve as of yet, I have a 190-e 2.6 mercedes benz 1989 not a e300 still checking different mech your insight give me much help and Im gratful for everyone for their good advice.
The Heater Control Valve has failed. It defaults to full defrost mode when it fails and blows hot air even when the A/C runs. Replacement part is $105 ...google Autohaus AZ for online parts ordering. BTW...HCV is located in the engine compartment right in front of the driver position in the corner by the firewall and inner fender...you'll see small coolant hose running to it.