heating problem - AC Auto Repair Help Forum


	Auto Repair Home	SEARCH POSTS	WHO'S ONLINE	LOG IN

Automotive Repair

Car Troubleshooting Topics
  Car Troubleshooting
  Engine Troubleshooting
  Engine Fault Codes
  Electrical and Wiring
  Transmission Problems

Car Repair Topics
  Car Making Noises
  Car Stereo Repair
  Heating or AC Issues
  Motorcycles and ATVs
  Tricks of the Trade
  Truck Repair Advice

Site Options:
  Login
  Sign up here!

Latest Forum Post

2006 Toyoto Camry XLE Driver Side Electric Window Trouble

Hello, Looking for a little brain help ...

Tierod end change caused some kind of leak

Hello so I just took my car to the nearb...

2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes

When I bought this car in summer 2023, a...

Grounding Cable, 2017 Jeep Renegade Trailhawk

The Cable that connects my negative batt...

Rough Idle (Found new thing)

Hi everyone. First of all sorry for bad ...

equipment

hey yall. im a first year engineering st...

HELP

I have a 1956 1/2 ton panel truck, 69 35...

Howdy

    Just wanted to s...

ABS/Tractiob/Brake Lights on But No DTCs

Hello all, Recently while driving m...

Chevy strut replacement

I'm trying to get a sensor of some kind ...

heating problem

Sign up here!

Email This Post

Auto Repair Home>> Automotive Repair>> AC Auto Repair Help Forum

thomasrb
New User

Jan 4, 2008, 3:18 PM

Post #1 of 4 (1708 views)

heating problem	Sign In

Having trouble with heater on 2002 Chevy Impala. It will not shift from throwing heat out of the ac vents on dash to the floor. Also fan does not seem to throw as much air as it used to. anyone have any ideas

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 4, 2008, 5:48 PM

Post #2 of 4 (1699 views)

Re: heating problem	Sign In

?Will this switch to other vents like defrost? Also can you hear a change with requesting fresh air vs recric or max?

T

thomasrb
New User

Jan 5, 2008, 3:06 PM

Post #3 of 4 (1688 views)

Re: heating problem	Sign In

The ac vents are open and hot air comes out of them. nothing goes to the floor. Also changing the recirc to outside makes no difference at all. Do not hear anything when changing it back and forth. Hope this gives you some clue as to what is wrong.
thomasrb

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 5, 2008, 3:29 PM

Post #4 of 4 (1685 views)

Re: heating problem	Sign In

Ok: This exact behavior isn't totally consistant but most vehicles use engine vacuum as the power to move the flaps in the heater box around. When that fails the setting usually defaults to defrost ducts only.

Look for a vacuum line, some look like wires instead of rubber hose, that goes into the car and for breaks in it. Some get burned or broken just doing something else as this is a bit too new for just age to get them.

Vehicles that use vacuum for ducts also use a reservoir for vacuum and check valve so ducts stay put when engine vacuum is not available. The line to that storage ball (GM has used a plastic ball in many models) if broken shuts the show down.

If these are electronic acutators this would not be the case and I can't understand why all selections don't work if an individual actuator which puts some suspision on the control head itself.

Does this car use digital settings and automatic temp control? Right now I hope not.

I don't have software for every car so I don't know how this one is set up. Perhaps someone does here. If not I can still help you with this thru another site,

T

Email This Post

Search for (options) Privacy Sitemap