Heat transfer stuck

When i turn the heat on it works but the transfer switch is stuck on defrost. I guess in the winter time defrost is the best place for it to be stuck because that is necessary ,during bad cold weather, for operation. However in the summer time i can't turn it off the defrost windshield position to send cold air out of the dash vents and it becomes a "sweat box" please help because until i get it fixed my wife will not get in it in the summer and i'll be forced to take her honda

Anonymous May 11, 2010

its gotta be either the mode door actuator which is the least costly or the control head no way to tell over thise computer but does it make clicking sounds

1 Answer

TechTry

Contributor 19 Answers
Posted on Jun 04, 2017

TechTry

Contributor

Joined: Jun 03, 2017

Answers

Questions

Helped

7120

Points

Our temperature control actuator is bad. It's a little motor that moves the temp door. They are about $70 at the dealer. To change it you need to remove the knee trim panel on the passenger side (3 screws, 7mm socket). The actuator is in the center above the transmission hump. It has one harness plugged into it and 2 screws (5.5 mm). Take the screws out and it should drop straight down. Align the actuator with the lever on the door and put the screws in. Plug the harness back in. Turn your temp control to cold and remove the HVAC 1 fuse. Should be in the fuse panel on the drivers side of the dash. Turn your key to run and leave it on for at least 1 minute. Turn your key back off and put the fuse back in.
P.S. The trim panel is a PITA to get off, so while you have it off check to see if you have the cabin air filters and change them while you are under there.
Big Daddy
Also there is an article in the Tech Corner on changing the cabin air filters.
GM# 52474810

2 Related Answers

jennifer godlewski

52 Answers
Posted on Jan 05, 2009

SOURCE: heater/ air conditioner stuck

You have a vacuum leak! Check the vacuum ball for cracks or missing hoses.
Good luck!

Wayne Tolonen

394 Answers
Posted on Jun 03, 2010

SOURCE: WINDSHIELD FOGGING UP INSIDE WHEN ITS SUMMER TIME

HI,
I think you are experiencing normal condensation,
try putting the heat and AC control to the position that blows a small amount of conditioned air up through the defrosters. This dries the windshield.
Good Luck !!!!!!!!!!!!

Add Your Answer

Upload

Upload an image from your computer

Uploading: 0%

my-video-file.mp4

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

Loading...

Include an image. It's worth a thousand words.

prev next

Related Questions:

0helpful

1answer

07 silverado ltz 1500 battery drains completely overnight.

did you check the hood light switch that another but the following links can assist you
How to Find Parasitic Battery Drain How to do Parasitic Battery Drain Test How To Perform Parasitic Draw Test EricTheCarGuy

Read full answer

Jun 05, 2017 • Cars & Trucks

0helpful

1answer

TRYING TO FIGURE OUT WHY MY NOTHING IS COMING OUT OF MY VENTS WHEN I TURN ON MY HEATER, MY DEFROSTER IS THE ONLY THING THAT WORKS.

There is a door inside your dash that switches from heat to defrost when you operate the dash control, it is not working. Could be as simple as a bad vacuum hose. You are lucky it is on defrost since it is close to winter.

Read full answer

Oct 14, 2016 • 1994 Plymouth Sundance

0helpful

1answer

03 Nissan frontier directional heater stuck. It's stuck on front vents and I need it to defrost the windshield since it's winter. Ac and heat work, fan works. Feels like it's jammed.

sounds like a bad actuator for the mode door. This actuator is an electrical motor that moves the door inside the HVAC box.

Read full answer

Nov 04, 2014 • Nissan Frontier Cars & Trucks

0helpful

1answer

Air blows out heater and vents but not the defrost when its just turned on just defrost? Help winters coming 1998 Cadillac Seville.

sounds like blending door is not moving, or stuck in place, some use a relay and fuse look in fuse box ,try it with car off and switch it from one to the other and see if you hear whats going on. it may also use a vacuum control.

Read full answer

Sep 22, 2014 • 1998 Cadillac Seville

0helpful

1answer

I own a 2003 1-ton, and the heat and a/c directional knob no longer switches from defrost to floor etc... It is stuck on vent, great for summer a/c but not for winter defrost. What is the fix?

There are two types of controllers for vents. Vacuum and electronic. Losing vacuum results in being stuck on defrost. So I will assume your's is electronic. First you will have to check to see if you have power and ground to the controller. A volt/ohm meter will check this. If you have both, then I would say the controller is bad.

Read full answer

Sep 09, 2014 • Cars & Trucks

0helpful

3answers

1998 Ford expedition motor not running hot enough

The engine is running at 210 you can be sure of that

Look at scan tool data

Your cabin heat issue may very well be several HVAC Blend
Door Vent Motors have failed
That data should be on the scan tool as well in enhanced data
& go to the hvac module

You can switch the heat or air flow to test if they are switching properly

Read full answer

Mar 05, 2014 • 1998 Ford Expedition

0helpful

1answer

94 deville concours ac works sometimes then u here duct door close and digital climate temp numbers go to blank dashes and defrost comes on and is stuck wont turn off then digital numbers come back on

My first guess would be a wiring problem or the controller.
If anything goes wrong with the system, it will default to the defrost mode for safety.

Read full answer

Jul 10, 2012 • Cadillac Cars & Trucks

0helpful

1answer

Heater and defroster don't work well

Connie this sounds like your thermostat in the engine is stuck open not letting the water stay in the engine block to heat up. The fix is to replace the thermostat with a new one that will allow the water to stay in the block to warm up. The typical symptoms of a stuck open thermostat is that the air will blow somewhat warm but never hot in the winter time, but it will take a few miles for the air to warm up at all. I would check with the dealership and find out what degree thermostat to replace it with. I run a 180 degree in the summer and a 195 degree thermostat in the winter just to have hot heat in the winter. I hope this helps

Read full answer

Nov 20, 2011 • 1992 Honda Accord

0helpful

1answer

Buick heat problem 1995 Park Ave.When I have the heater on switch to defroster I only get heat out of the drivers side in both setting,heater/defrost. The car has dual climate control I have set the...

Check the actuator motors on the inside on the heater box to see if they are working. They are small motors with rods mounted on the outside of the heater under the dash. This motor moves the arms that direct the heat to where you want it.

Read full answer

May 08, 2017 • 1995 Buick Park Avenue

0helpful

1answer

Heater/ defrost

no heat can be a t stat problem and the defroster sounds like a vacuum canister that controls the switching is not operating

Read full answer

Oct 20, 2008 • 1992 Buick Park Avenue

Not finding what you are looking for?

View Most Popular

2000 Silverado 1500

Cars & Trucks

07 silverado ltz 1500 battery drains completely overnight.

Cars & Trucks

96 views

Ask a Question

Usually answered in minutes!

Check Out the Latest Top Trucks Report!

View all Fixya Reports

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

Answer questions

Manuals & User Guides

Have a manual for 2000 Chevrolet Silverado 1500? Or just drag it here!

Related Topics:

Heat transfer stuck