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Question DetailsAsked on 12/2/2016

How much should i expect to install a heater blowed in a 2002 CHEVY GRAND PRIX

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Could not find ready access to info on changing out the blower motor for your year and model - the price depends GREATLY on whether the &*()&&%%$ design engineers designed it so it can just be swapped out in 5-10 minutes or so, or tucked it in behind A/C equipment and pressurized tubing so the A/C system has to be evacuated and partly disassembled - which can drive the cost up to the $500-600 range if that is needed.

Assuming accessible - aftermarket motor only is around $30-50 for your model, motor with blower fan about $70-100, and labor for normally accessible unit would be minimum shop charge of about $70-100 typically (more like $90-150 at a GM dealer).

It is also possible that the motor is fine, and only a resistor or the fan speed switch needs replacement - similar cost for those or a bit less if resistor issue. Generally - if blower works at any fan speed setting, motor and blower fan are OK - switch is probably the issue if some positions do not power it. If only runs at one speed regardless of fan control setting, resistor(s) are likely issue. If does not run at all, could be any of above, plus occasionally fan blockage by blown in leaf or road debris or such.

If fan runs but no air movement into car, then leaf blockage of the air intake for the unit (if it has individual screening, not just pulling air from engine compartment) can cause that, as can failure of the damper valves - shutters or "gates" that move to direct the air different places in the car. Also rarely crudded up (debris, dust, mold) of the A/C evaporator coil, which the air flows over on its way into the car. Some cars also have a filter on that airflow that will block airflow if crudded up. In each of these cases, the failure would have been gradual - not sudden loss of airflow. Cabin air filter is something you can change, though evidently only some Grand Prix models came with them OEM - filter cost about $10-20 aftermarket, around $40 OEM depending on size.

Answered 3 years ago by LCD

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