Question about 1999 GMC Sonoma

1 Answer

The heater control does not switch from the floor to the dash. It's stuck on vent. What part does it take to fix the problem? Is it just the control knob?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Governor:

    An expert whose answer got voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 90 Answers

It is probally in the heater box behind the dash. It is controlled by vacuum line

Posted on Sep 26, 2009

3 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 269 Answers

SOURCE: my vent is stuck on floor position and heater

The thing to do is check for vacuum leaks. In the engine bay look for any "hoses" coming from the firewall. These are for the heater contols. If any of these are broke? Replace them . Have you installed a after market radio? Sometimes heater controlls get messed up. I would take the radio out and examine the heater controlls.

Posted on Jan 10, 2011

  • 67 Answers

SOURCE: my dash knob that controls defrost/feet,

remove switch wires fried

Posted on Mar 30, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My air runs cold but is stuck between defrost and front vent. How to fix


Pull the control panel out of the dash and see if the mode control vacuum switch has a good vacuum source or the switch itself leaks vacuum. The mode control is what moves the doors that diverts the air flow around to the vents, defrost and floor.

Sep 20, 2016 | 2004 Hyundai Elantra

2 Answers

1998 chevy blazer heater problems. wont switch from defrost to floor. stuck on vents right now. how do I fix this problem.


Most likely either the vent switching mechanism is dirty and won't switch the flaps -or- most likely the vacuum that is used to turn the vent flaps is either leaking and not pulling enough vacuum. You will have to get underneath the dash near the center, to check and see if you can manually move the vent flaps. If so, then most likely it is a vacuum leak in a vacuum line to the flap mechanism.

Dec 02, 2014 | Cars & Trucks

1 Answer

I have heat but no dash defrost or floor heat


it could be a bad switch... it could also be leaking vacum lines (vacum is what operates the dirictional doors). it could be a stuck door, or bad hinge. it could also be loose ducts underneath the dash.

Feb 11, 2014 | Mercury Mountaineer Cars & Trucks

2 Answers

The heater core is going bad in my blazer, but it still blows hot air. When I turn the control to switch the heat from vent to defrost or floor, it still blows out of the vent. How do I fix this?


THAT HAS NOTHING TO DO WITH A HEATER CORE IF CORE IS GOING OUT IT WILL LEAK THATSOUNDS LIKE AN ACTUATOR ACTING UP OR VACCUUM LINE LEAK BEHIND DASH

Apr 06, 2011 | Chevrolet Blazer Cars & Trucks

2 Answers

My 2004 tralblazer a/c will blow out the floor when you put it on the dash vents why?


The heater / a/c vents are controlled by vacuum,or electronic devices. What is happening in your Trailblazer is the Vent Doors are either stuck in a open or closed position thus only having air flow to the floor vents only..The actual vent door is located in the heater box next to the blower motor.

Feb 19, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

My vent is stuck on floor position and heater control assembly wont switch to dash were do i start to fix problem on 83 cutlass supreme


The thing to do is check for vacuum leaks. In the engine bay look for any "hoses" coming from the firewall. These are for the heater contols. If any of these are broke? Replace them . Have you installed a after market radio? Sometimes heater controlls get messed up. I would take the radio out and examine the heater controlls.

Jan 10, 2011 | 1983 Oldsmobile Cutlass Supreme

1 Answer

1998 chevy monte carlo , can not switch


Problem is in the vaccum feed pipe (Cracked) or the actual control panel.

Mar 10, 2010 | 1997 Chevrolet Monte Carlo

2 Answers

Heater control 98 chevy s10 blazer


These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Dec 13, 2008 | 1996 Chevrolet Blazer

1 Answer

Heater vent doesn't shift to all positions


Sounds like you have a vacuum leak, those controls are are accuated by vacuum.

Dec 02, 2008 | 1995 Jeep Grand Cherokee

Not finding what you are looking for?
1999 GMC Sonoma Logo

Related Topics:

197 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

75077 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...