Question about 1992 Pontiac Bonneville

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92 bonneville. The heat suddenly stopped blowing at low or high.

The heat just suddenly stoped blowing. I think the relays are ok but not sure. How do I find out if its the blower motor or the relays. Also is there anything else that could cause this

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Jump 12 volts to the blower motor connector and see if it runs, if it does replace te blower motor speed control module

Posted on Dec 16, 2008

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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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Why do my heat only blow on low in my 93 bonneville sse


this is usually due to the switch wearing out, replace switch or remove switch and put jumper wire straight from 12 volt supply to the high terminal, if you prefer to have high, switch is typically 12 dollars and easy to replace.

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1 Answer

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