Automotive Air Conditioning Information Forum (Archives)

Provided by

We've updated our forums!
Click here to visit the new forum

Archive Home

Search Auto AC Forum Archives

Vent/fan clogged then unclogged then warm air

BuffyWuffy on Tue July 29, 2008 10:37 AM User is offline

Year: 2004
Make: Mazda
Model: 6
Engine Size: 2.3L
Country of Origin: United States

Let me start this off by saying I know very little but would like to learn. I'm happy to do something myself if the risk of me destroying anything is minimal. I figure I need to take it in for a recharge or something but would like to have an idea of what's going on first. I'm a girl and don't want to get pushed around.

Here's the sequence of events (I apologize if my lack of knowledge or bad explanation makes you cringe!):
A/C was never great but it was sufficient. I figured it was normal for sunny south Florida.

One day (a couple of weeks ago), I heard a noise and suddenly my vents seemed clogged and barely any air was coming out even on high. Problem seemed worse on passenger side. The small amount of air that came out (mostly on the driver's side) was cold.
I planned on taking it in but the next day whatever got clogged seemed to make its way through. When I turned the air on, it seemed to cough up whatever it was, but was still not blowing great and the fan was making a noise. Passenger side was blowing warmish air and the driver's side was blowing cold air.

After reading around on the internet I decided to check my cabin filter. Sure enough it was disgusting and broken (which I'm guessing happened the day I heard the noise and the vent wouldn't blow). I changed it. Fan/vent seem to be working fine, but the passenger side isn't blowing cold air, while the driver's side does. Vent air gets progressively warmer as you move to the right. If I close the driver's side vents, some cool air seems to make its way down. The vent all the way on the right, however, won't and even with the fan on high it doesn't seem to blow as strongly as the rest of the vents.

After many days of just keeping passenger side vents closed, they were open and on yesterday for a good while. Today I turn on the car and the ones in the middle seem to be blowing cooler than before, but the one farthest to the right is still not cool or blowing very well.


HECAT on Tue July 29, 2008 3:32 PM User is offline


Not taking into account you may have a refrigerant leak and the system is not performing properly. The filter may have broken or a blend door may have stuck (maybe with broken filter pieces). The blend doors control warm air from the heater core and cool air from the A/C. You may have some mixing of both if a door is not operating properly. You could pinch closed one of the heater hoses, be careful not to damage, to see if this improves cooling. Maybe if you can tell us where in FL you reside, we could guide you to a reputable shop for further assistance.


HECAT: You support the Forum when you consider for your a/c parts.


BuffyWuffy on Tue July 29, 2008 3:50 PM User is offline

Thank you so much for your reply. I wouldn't have any idea where the hoses are, but would be happy to try with some guidance. I know that when I turn the temperature knob for the heater, all of the vents blow equally hot air. Would that mean that when I turn it back to cool it just isn't closing it all the way?

I live in Miami, FL 33145. I would love a place near by but of course wouldn't mind traveling a bit for a reputable place.

Thanks again.

HECAT on Tue July 29, 2008 4:35 PM User is offline

There will be two hoses going from the engine to the firewall, they carry hot water from the engine to the heater core in the dash. They should be fairly easy to identify because they will be very hot to the touch with the engine hot. If you can restrict or stop the flow of hot water to the heater core (without damaging the hoses), and cooling improves; this would indicate a high probability of a blend door problem (mixing cool and warm air).

You can search for MACS (Mobile Air Conditioning Society) member shops here...

I have listed a few I found in Miami, there may be more in surrounding areas but I am not familiar with what else is close. I cannot speak to the level of service you may receive at these shops, but MACS membership is the first thing I will look for.

O&A Auto Air Service
3219 SW 8th St
Miami, FL 33135-2605
Phone: (305) 443-6181
Fax: (305) 443-1720

Doug's Automotive
8800 SW 129th St
Miami, FL 33176-5919
Phone: (305) 238-6566

Auto A/C World, Inc.
7920 NW 67th St
Miami, FL 33166-2631
Phone: (305) 468-8387
Fax: (305) 468-8239


HECAT: You support the Forum when you consider for your a/c parts.


Back to Automotive Air Conditioning Forum

We've updated our forums!
Click here to visit the new forum

Archive Home

Copyright © 2016 Arizona Mobile Air Inc.