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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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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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

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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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What is causing my car to blow cold air from heat. them it over heats while blowing cold air when hot air does blow car runs fine no overheating please help. 2000 Monte Carlos 3.4

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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2000 pontiac bonneville blows hot and cold at the same time

Sounds like the blend door motor isn't working.

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you didnt mention changing the thermostat, common culprit of this problem, the thermostat is in the waterneck at the motor end of the top radiator hose, easy fix, be sure to use new waterneck gasket when putting back together

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My 2000 Bonneville has dual heat and air, the passenger side blows out cold air while the driver blows out warm air. How can I fix this problem myself??

I assume that your concern is about trying to get cold air from both sides (not warm).
It could be the actuator or blending doors, but the most common answer is that your freon is low. I have a 2005 Bonneville and had the same problem. The good news is that you probably only need one can of freon and the auto parts stores have kits for the do-it-yourselfer. If you haven't done it before, I highly recommend going to someone that has done it before.
The bad news is that you have a slow leak, and it will not fix itself. You will probably have to pay a professional big bucks to eventually find and repair the leak.
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.

Nov 11, 2010 | 2000 Pontiac Bonneville

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Cold air on passenger side and warm on the drive.

If the actuator door motors are working,then the door,itself,is broken,and is not moving with the actuator motor.

Jun 13, 2010 | 2000 Pontiac Bonneville

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my 2004 pontaic bonneville the heater hoses going into and out from the heater core are hot , but the heater blow cold air. ,

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check for bad vacuum lines going to firewall under hood,or bad check valve in same line

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heater core may be going bad...things to check.. heater core, thermostat, anti-freeze/coolant, wires to the heater.

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Heater blows cold air

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Jan 23, 2009 | 1997 Pontiac Bonneville

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Air conditioner leaks into passenger floor board

If it is just clear water it is the drain tube that might be plugged, u can see the tube from underneath the car, it may have dirt in it. if it is sticky or orange or green it is coolant and that would indicate a heater core leak. The heater core is is what allows you to have cabin heat. If it is coolant the 1st thing i would try is a tube of powdered alumaseal, you can get it at any auto part store. DO NOT USE BARS LEAK OR ANY OTHER PELLET STOP LEAK, as they very rarely help and more often than not they clog up other areas in the cooling system, the Alumaseal is a silver powder made from aluminum and adhesives that works amazingly well.

Jul 04, 2008 | 2005 Pontiac Bonneville

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