Question about 1998 GMC Sierra

1 Answer

97 Sierra no heat on passanger defrost or floor

There is no air flow in passanger defrost or floor, drivers floor is weak but there... yet drivers defrost and all dash vents work good.... Please help, Wife says she's freezing!!!!

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 13 Answers

I assume you have the dual climate control feature on your truck. it sounds like you have door problems. The heating system has several doors inside the box and duct work that divert the air from defrost to face and feet...i'm not 100% sure if the ones in your truck are electronic or vaccum, but i think they are electronic. From time to time the actuators that control the door go out, as every electric motor does. You need to find the ones that have quit and replace them. It is possible that the arm(s) on the actuator(s) have broken loose from the doors and are working but not pushing or pulling the doors properly...if might help to remove the front seats...just to help save your back....working under the dash is hard on your body....and it take a good half day to remove the dash, so working under it is actually less work.

Posted on Mar 13, 2009

1 Suggested Answer

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

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

04 Silverado my heater speeds work but very weak,high feels like low.I replaced module and harness,30amp fuse,10amp fuse which were both blown.


Plugged cabin air filter ? Mode or temperature door stuck closed ? Can you change direction of air flow ? floor ,vent , defroster . Change the heat to A/C .

Dec 27, 2015 | Cars & Trucks

2 Answers

Toyota tundra floor heat quit


sounds like vaccuum line problem or vaccuum assist

Jan 13, 2014 | 2002 Chevrolet Tahoe

1 Answer

Have a 1996 buick park avenue heater works only on half the car passanger side has heat driver side cool air the defrost to vent to floor doesent work check for vacume to heater switch no vacume at all...


you can have relay fan faulty, blower, or heating elements or duct NOT o.k .However you can go to www. aa1car.com get the topic and fix it.
God bless you

Nov 20, 2013 | 1998 Oldsmobile Intrigue

1 Answer

I have a 97 chevy k2500 the fan works, heat and ac works, the floor vents and dash vents work but cant get any air to blow out of the defrost vents. help i have replaced the control panel, still have...


Your vehicle uses electronically controlled blend doors to direct th air flow from defrost to vent and to the floor . If the door motor is bad then it will stay at a fixed position so you will not get the air to flow out the defrost ducts. There are at least two of these one for air blend and one for fresh air. They are located on the passenger side usually under the plastic cover and have a wire harness that plug in and are usually shaped like a piece of pie.

Mar 03, 2011 | 1997 Chevrolet K2500

1 Answer

97 plymouth voyager , blower works great but air will not deflect to defrost, stays on floor?


there is a actuator that makes a flap flow air out the defrost or the floor they work off vacuum . need to check see if vacuum hoses bad or broken .to get to actuator -the heater box under dash.

Nov 02, 2010 | 1997 Plymouth Voyager

1 Answer

Heat does not come out passenger side of the car but comes out drivers side


There is a blend door problem.

---
prev.gif next.gif HEATING AND AIR CONDITIONING Refer to Section 1 for discharging and charging of the air conditioning system. The heating system provides heating, ventilation and defrosting for the windshield and side windows. The heater core is a heat exchanger supplied with coolant from the engine cooling system. Temperature is controlled by the temperature valve which moves an air door that directs air flow through the heater core for more heat or bypasses the heater core for less heat. Vacuum actuators control the mode doors which direct air flow to the outlet ducts. The mode selector on the control panel directs engine vacuum to the actuators. The position of the mode doors determines whether air flows from the floor, panel, defrost or panel and defrost ducts (bi-level mode).

Oct 28, 2010 | 1998 Oldsmobile Regency

1 Answer

AIR FLOW CONTROL HEAT an aircon. Will not go to floor or defrost.


i had that problem but in reverse i had no vents, its a hvac mode acuator, it controls where the air goes sounds like yours is dead

Mar 18, 2010 | 2001 GMC Jimmy

1 Answer

I have a 97 SIERRA. HEAT WORKS FINE ON DRIVERS


If you have climate controls that are "slide type" knobs...likely that the cable that controls the diverter panel in the blower box is broken....

Feb 27, 2009 | 2000 GMC Jimmy

1 Answer

Reduced air flow in a 2003 venture when selected to vent


open glove box and open door in the back ,remove air filter and clean,then re install,and make sure to close the door tightly.

Nov 30, 2008 | 2003 Chevrolet Venture Passanger

2 Answers

No dashboard heat output


The climate control was poorly designed on these cars.

There is only heat on the floor and defrost settings, due to the layout of the ductwork.

Oct 22, 2008 | 1989 Ford Festiva

Not finding what you are looking for?
1998 GMC Sierra Logo

228 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

64286 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21990 Answers

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

Answer questions

Manuals & User Guides

Loading...