SOURCE: ac/heater blower relay
Center Rear Of Engine Compartment, At Cowl
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SOURCE: Hello I have a 1997 Bonneville SE
you need new blower module located at blower under hood, against the firewall under the relays it has four or five wires in it, and two bolts holding it in.
SOURCE: the blower motor and AC works but the heater
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!
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