no air from heater vents

whynot · Post by **whynot** » Sun Feb 16, 2014 1:20 am

I was coming home tonight, and lost all air from my heater.
The fan runs, you can hear a change when changing the recirc. knob. but there is not any air coming out of the thing.
The air was not getting very warm, but no air is not an option, where do I start and why no air, on any setting hot or cold.

Donkeypuncher · Post by **Donkeypuncher** » Sun Feb 16, 2014 4:48 pm

Sounds like the blower motor is dead. I hear it's not fun to replace.

neonrog · Post by **neonrog** » Sun Feb 16, 2014 8:31 pm

Maybe a cracked or broken vacuum line.

whynot · Post by **whynot** » Sun Feb 16, 2014 9:36 pm

blower is not dead. I can hear the fan. Just get nothing out of the vents.
The recirc door makes a change in the sound of the fan. But still nothing out of the vents.

Post by **occasional demons** » Sun Feb 16, 2014 10:51 pm

The recirculate only changes where the air is drawn from, either the cabin, or the outside. Probably not where the problem is.

The air blend door is attached to the temperature control knob via a cable, and the position selector is also cable actuated. You may need to pull the HVAC bezel and see if you can tell if the cable has come loose.

Regardless, there should be some air movement from one of the outlets.

Unless there is enough debris built up against the evaporator core that there isn't any air getting through. All the air passes through the evaporator before it gets to the heater core, or the other vents.

If the A/C compressor clutch has malfunctioned, it could be running the compressor constantly, and frozen the evaporator solid.

Check this for a detailed write up on the HVAC removal, for some good reference pictures, that might help out.

viewtopic.php?t=49477

whynot · Post by **whynot** » Mon Feb 17, 2014 1:10 am

Can I pull the blower without pulling the entire dash? it would allow me to see that there is nothing in it blocking the fins.
Not looking like fun from that post

Post by **occasional demons** » Mon Feb 17, 2014 8:57 am

I believe the blower motor drops out from the bottom. I know it does on the 1gn's. It is a tight squeeze getting it in/out, but there are far worse jobs.

whynot · Post by **whynot** » Tue Feb 18, 2014 12:13 am

ok, it is working fine today. What gives?
I am thinking maybe the blower sucked something in that blocked the evap core? And has now moved?
Or what? If the door was broken, why would it start working again.

NickKo · Post by **NickKo** » Sat Feb 22, 2014 11:05 am

whynot wrote:ok, it is working fine today. What gives?
I am thinking maybe the blower sucked something in that blocked the evap core? And has now moved?
Or what? If the door was broken, why would it start working again.

The evap door is probably not 'broken', but it's 'binding'.... Something is causing it to 'get stuck'.

The issue may be a blockage at the door itself (debris?); or the controls themselves are binding.

- Nick

whynot · Post by **whynot** » Sat Mar 01, 2014 5:41 pm

but that door is driven by a cable? it seems to adjust fine from the knob. And why did it just start working? If it bound up, and I cycled that knob on the way home, to no change, probably about 20 minutes. then the next morning, nothing is wrong, and has been fine since...