Question about 1998 Oldsmobile Bravada

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Only blows hot air and it move automatically from defrost, to panel to floor. When I turn AC on, it is still hot but AC motor kicks on and off and AC condenser is COLD.

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  • Oldsmobile Master
  • 803 Answers

Most likely low on refrigerant. Have system filled with refrigerant and a/c dye. Any leaks would be visible with black light and uv glasses.

Posted on Dec 29, 2013

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Posted on Jan 02, 2017

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SOURCE: 99 oldsmobile intrigue

The ambient temperature sensor going bad causes this exact problem. I've replaced many of them because when they show outside temp as being below 60 degrees, the A/C control module will shut the compressor off.

Posted on Aug 08, 2008

  • 89 Answers

SOURCE: Dashboard AC Vents don't work

check the vent housing under dash it is vacuum controled most likley you got a line off or broken not allowing door inside to open worse case scenerio the acuator on it has gone out and needs replaced hope this helps

Posted on Aug 31, 2008

  • 1348 Answers

SOURCE: even when air is off, hot air comes out all pass side vents

it is the flap door inside the heater box area.alot of gm with electronic climate control have the problem.there is an actuator motor that needs to be replaced.

Posted on Jun 14, 2009

  • 1915 Answers

SOURCE: Blend door stuck on heater position and driver

I had this exact problem in a 2000 and it ended up being the air filter (engine compartment, pasenger side cowl)-all I did was replace it and both sides worked properly-you could try removing it and see if that solves it, if not I would think either the climate controller has a problem (vacuum line?) or maybe the blend door itself needs to be adjusted-hope this helps

Posted on Jun 26, 2011

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I have a 98 bonneville se. the blower fan only comes on when the knob is all the way up and it ONLY blows heat and absolutely no cold also the air only blows out the defroster and the floor


How did you test the A/C system ? Hook up gauge manifold , test A/C pressures ? Manual or automatic climate control ? The blower motor only working on high means the blower motor resistor is bad ! Did you hook up a scan tool an check high an low pressure switchs inputs to the PCM - engine computer . Does the A/C compressor clutch engage ? turning on the compressor ? Moving the mode switch does nothing . Doesn't move from floor to vent to defrost ? Probably the mode door actuator ! Don't think the HVAC control panel is bad . Just a few little things . Pushing the A/C button on the control panel just send a electrical signal to the PCM , the PCM will energize the A/C clutch relay , turning on the compressor .

The Trainer 40 When the compressor won compress

Blower Motor Problems Auto Repair Help

Do you know how to test automotive electrical circuits ?

Heater Blower Motor Troubleshooting


May 19, 2017 | 1998 Pontiac Bonneville

1 Answer

HVAC only blows hot air and moves between defrost, panel and floor


vacuum controls stuck work the knob a bit and try to free it..

Dec 29, 2013 | 1998 Oldsmobile Bravada

1 Answer

My heater does not blow in floor in a dodgeram 1500


the heater vacuum motor and lines needs to be checked.Also get the blend door checked.

NO HEAT ON FLOOR VENTS

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As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html


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No heat on Oldsmobile Silhouette?


http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

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Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

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1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

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Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

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Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

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Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

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Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

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2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html

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2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

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AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

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Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

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These will help.

Thanks.

Nov 28, 2012 | Cars & Trucks

1 Answer

Ac vents not working


There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

Jun 13, 2012 | 2007 Ford Sport Trac Limited

2 Answers

Air Conditioner Will not turn on Recirculation


there is a selector motor on the side of the heat ac coil box under the dash. it should have 2 or 3 levers on the side of it. it controls the dampeners the select where your air is moving to from the defrost to the bi level to the floor or all of the above find that control module and then turn the car on and start moving the selector switch back and forth slowly while watching that module if its moving the levers then you have a more serious problem and need to have a professional look at it. check to make sure that the levers are even connected and that the wiring harness is even hooked to the control module

Jul 13, 2010 | 2001 Chevrolet Venture

1 Answer

Driver's side defroster and heater vents blow cold air but the passenger side blows hot. Both sides should blow hot The temp is set any temp and it still does the same thing. It is winter so I don't know...


The doors that open and close in the heater control unit are ran by motors. It sounds like a motor has quit in yours. When turning on the defrosters the motor closes the door to the heat for the floor

Jan 12, 2010 | 1995 Cadillac DeVille

1 Answer

I have a 2003 Jeep Grand Cherokee Overland with automatic climate control. The drivers side blows cold air constantly. It has no heat.


sounds like the blend door motro may be bad, this motor is screwed to heater box, there are a few of these motors one for pass/side for hot/cold air then one to control position of air like defrost or vent or floor, then the driverside cold/hot air, i think this motor is on driverside part of heater box, to make sure locate each motor while moving all controls until you spot the one that doesnt move, then remove it and move door manualy to see if you get heat, then replace that motor, hope this helps,

Dec 26, 2009 | 2003 Jeep Grand Cherokee

1 Answer

1993 ford e-150 conversion van heat and a/c


Selection lever does not move to AC vent or floor vent only to the defrost. AC compressor does not kick in when AC is selected.
Vacuum level is at 18 instead of 23.
Any suggestions.

Oct 19, 2009 | 1993 Ford Econoline

2 Answers

I have a mercury mountaineer 2003 V6. It has a problem of making sound repeated when I want to have heat turned on. No sound when the dashboard A.C/Heat stays at AC level, which is the zero? level. The...


When the engine is cold,check the coolant level.

Make sure it's on max.

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A coolant system should be flush every two years.

===

If you did a coolant flush recently then air pocket can be the cause of the un-even heating problem.

The DIY method is to drive you car onto a ramp or a steep hill.

Iet the engine cool off and top off the coolant tank.

Set MAX heat + MAX fan

Let the engine ran for 20 minutes wih the cap off and the trap air will escape from the coolant reserve tank,

Check coolant level and top off coolant when the engine cools down.



A shop will charge $75+ for this but using an air operated excavate tool!

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A car with over 90K miles may experience linkage problem to the heater control valve.

The heater control valve (near the firewall) may be stick over time.

Open the hood and move the heater to max and min. Back and forth.

Clean and lube the linkage with WD-40 to free the heater control valve.

If it's a vacuum type heater control valve then cash for leaky vac. hoses.


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Move the fan switch back and forth to re-new the electrical conductors.

Pass a vacuum over the control panel to prevent dust build up behind the console.

Sep 13, 2009 | 2003 Mercury Mountaineer

2 Answers

2000 Mercury Grand Marquis will only blow hot air when ac is on. The ac system does work lines get cold but will not blow nothing but hot air. Has automatic climate control system. Will direct air from...


needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved

Jun 21, 2009 | 2000 Mercury Grand Marquis

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