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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

I tested the ac system and it all checked out. is there any way this could be the control switch in the dash since it affects every aspect on the climate control system?

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Jeff Armer

Pontiac Master 15,575 Answers
Posted on May 19, 2017

Jeff Armer

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Joined: Nov 22, 2012

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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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I have a 2000 Pontiac Bonneville SE and the cold/hot selector knob is not positioned right. To get max heat it has to be a little over 3/4 turned toward high heat.

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1998 Bonneville

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I have a 2000 Pontiac Bonneville SE and the cold/hot selector knob is not positioned right. To get max heat it has to be a little over 3/4 turned toward high heat.

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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

1 Answer

Jeff Armer

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1998 Bonneville

I have a 2000 Pontiac Bonneville SE and the cold/hot selector knob is not positioned right. To get max heat it has to be a little over 3/4 turned toward high heat.

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Trustworthy Expert Solutions

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

1 Answer

Jeff Armer

Add Your Answer

Attachments: Added items

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I have a 2000 Pontiac Bonneville SE and the cold/hot selector knob is not positioned right. To get max heat it has to be a little over 3/4 turned toward high heat.

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