Question about 1997 Pontiac Bonneville

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My heat is not working in a 97 pontiac bonneville

My heat is not functioning it blows cold air. i have not had a leak in the passenger floor board. so i dont think its the heater core also only one of my hoses is warming up from the engine to the heater core possibly some sort of blockage can you flush the heater core usung a hose and water? also i tried looking for a diverter because it does not make a sound when switching from heat to cool. but i need help in locating it. if thats my problem. also i need detailed directions on how to remove the heater core if this is my problem. thank you for all the help

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  • Pontiac Master
  • 9,771 Answers

You have correctly trouble shot a plugged heater core. Install a back flush kit on the car. They can be had at an auto parts store. Get new anti freeze too.

Posted on Dec 06, 2014

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Posted on Jan 02, 2017

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Molson02536
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SOURCE: I have 2001 Pontiac Bonneville My heat works but

Your passenger side temperature door actuator is bad. You can access the actuator by removing the glove box & hush panel. The actuator is on the side of the HVAC box. If you can gain access to the actuator watch the center of the actuator as you change the temp on the control head, if the actuator does not move it is bad, if it does, the door inside the HVAC box is bad. Most likely its the actuator. If you remove the actuator & open it up you will most likely find the large center plastic gear is cracked all the way through. It is held in place by 2 or 3 7/32 screws. Once you replace it, disconnect your battery wait 30 seconds and reconnect it to reset the HVAC control head so it can relearn your actuator positions. It can take up to 5 minutes for the control head to go through it's relearn procedure. You can try resetting the actuator first , but make sure your radio is turned off before you disconnect the battery and if your luck, the actuator may not have any broken parts and the gears may just need to be freed up and lubed. Good luck friend and hope this helps.

Posted on Oct 22, 2009

  • 200 Answers

SOURCE: 98 bonneville-heater does not blow hot air.

Well looking at your tests here the only logical explanation is that you have a bad blend door switch, blend door servo, air leak in the control valve for the blend door, or the blend door has broken off in the air duct or some other obstruction in the air duct blocking the flow of air to the heater core.

Posted on Jan 20, 2010

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more than likely your losing cold water from your water system, make sure your water pump is up to scratch...sounds strange, but you need cold water for heat through your air conditioning...

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Sounds like the blend door motor isn't working.

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I assume that your concern is about trying to get cold air from both sides (not warm).
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I've topped my freon off a couple times, and suspect the leak is down by the compressor. I'm currently sweating it out until I can get it fixed.

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