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Climate control on a 98 Pontiac Bonneville

I have a climate control Heater/ AC and now all I get is heat, the air conditioner comes on when the AC is turned on but all the heater does is throws out heat when you turn down the perferred temp. the fan increases speed and it gets hotter. The line from the compressor gets cold so something is not turning on the air, I have checked all the fuses and they are okay.

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If the compressor suction line is getting cold and sweating and the line going out to condensor is hot - the compressor is working - the electric door to cut off heat is stuck or motor coupling could be broke - this unit under the dash can be hard to get to - i have installed a valve in heater hose to cut off hot water in summer on older cars - cheap fix - unless you want to take out dash

Posted on Sep 20, 2009

Testimonial: "Checked out everything and it was as you said so for now until I get the right valve I squeezed it shut and what a blessed relief. Again thanks"

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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 .

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May 19, 2017 | 1998 Pontiac Bonneville

1 Answer

Why is my air conditioner running when heat is selected on year 2000 mazda b3000.


check ur switching box make sure is turning the ac off disconnect form the switching box inside and see if ac goes off if so control box is at fault repair or replace. Good Luck

Nov 17, 2016 | Mazda Cars & Trucks

1 Answer

The heat does does not work in my 98 Tahoe at all its blows cold all the time I have done changed the there and put new coolent in it still have no heat so I by pasted the heat valve and ran it right in...


If you are getting hot water/coolant to the heater core and still no hot air coming out the vents, then it's a issue with the climate control or blend door. After running your engine and it reaching normal operating temp, locate your heater hoses that goes to the heater core. Carefully touch them to make sure both hoses are hot to the touch, if they are, you are getting hot water/coolant to and from the heater core. So, then it will have to be a issue with the climate control in the dash or either the blend door in the air box. It's a common problem for the climate control to go out on these models, hope this helps.

Nov 26, 2013 | Cars & Trucks

1 Answer

1998 pontiac Bonneville ac blowing out the defrost only


theirs a vacume control module under passenger side airbag that goes out

Jul 06, 2012 | 1998 Pontiac Bonneville

1 Answer

1998 bonneville climate control air does not come through dash vents


you may have a blown heater fuse, either in box under dashboard or under hood in black box on drivers side fenderwell check those fuses 1st

Aug 13, 2010 | 1998 Pontiac Bonneville

2 Answers

1997 Bonneville SSE, when the heater is turned on, only cold air


you may have a failed blend air door motor/actuator. this part will regulate the amount of air from the heater core depending on the temp setting on your electronic climate control unit. if it has failed, it will be stuck at the temp that it was last set at when it quit working. it is also possible the heater core may be plugged up, but using the gm recommended dexcool coolant and flushing it out every 5 years, it should not be plugged up. you can pull the 2 heater hoses off the heater core on the passenger side of the engine compartment firewall and see if the heater core is the problem. caution-do not use a high pressure air hose to blow through the heater core as this could damage it and cause a leak!

Oct 15, 2009 | 1997 Pontiac Bonneville

2 Answers

The blower motor and AC works but the heater doesn't in a 2002 bonnieville Pontiac. I turn on the AC and it works fine. I switch over to the heat and it just blows cold air.


if your vehicle has the electronic climate control, it is probably the blend door motor/actuator that has failed and is stuck at the temp that was last entered in the climate control unit when it failed. this can be a very time consuming repair to do as it is under the dash. the other possibility is your coolant level is low and not allowing the heater core to bring the outside air up to the temp you want. if that is the case,your low coolant temp sensor should have come on. if not, then the thermostat could be either stuck open or closed. if stuck open the engine would not always show the temp gauge at normal operating temp of 195-200 degrees. if stuck closed the engine should be overheating according to the temp gauge. you did not mention what the operating coolant temp was!

Oct 14, 2009 | 2002 Pontiac Bonneville

1 Answer

My 96 bonneville is blowing heat


sounds like the vacuum lines that direct the air over the evaporator is maulfactioning and let it blow air over the heater core all the time

Jun 15, 2008 | 1996 Pontiac Bonneville SE CA Value

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