I have a 1985 Toyota Corrola and a 1988 Chevy Nova (really a corrola).
The original; blower fan motors in both failed about 3 years ago. I replaced both with blower fan motors from an auto parts store. A month ago, the 3 year old blower fan motors in both cars failed. The auto parts store provided replacement blower fan motors under warranty. Which I installed. One failed after operating 50 miles of distance. The other just failed after 500 miles.
When the auto parts store provided another replacement blower fan motor under warranty a few weeks ago, the manager said it looked like the failed motor had been made with plastic brush holders and he provided one that had copper brush holders.
Despite believing that the previous motors were cheaply designed, I wanted additional assurance that there isn’t something else wrong in the electrical systems of both cars. I haven’t yet mounted the new blower fan motor but had a friend who understands electricity better than I to check both cars with the newest blower fan motor plugged in.
We measured 14.3 volts at the battery when the engine was revved up on both cars, and we measured 12.3 volts at the fan motor while it was running on high speed.
With the engines warmed up and idling and the lights and wipers on we measured 11.5 volts at the new blower fan motor on the Nova (stick shift and higher idle speed). And 10.5 volts at the new blower fan motor on the Corolla (Automatic and lower idle speed).
Does anyone know if these measures are within the range of blower fan motors for this car. Does anyone know of any other reason that I’ve had this many blower fan motor failures in such a short time?
The car operate nothing more than 12V systems. your alternator will also put out same amount of voltage to recharging the battery. there is no step up transformer in the vehicle to get more than 12V maybe a bit more but will be way under 13V, since it happened to the same car and type, I would say its the manufacture default. Ive have experienced same issue like yours on new parts, my suggestion is to change the brand. some manufacture after market company will build them as cheap as possible cutting corners to save cost. Inside of the motor what common parts fail is the contact brush, it can short or burn out over times, sound like what ever that manufacture are using is fairly cheap. since it happened to both car putting out the same amount of voltage my guess would be manufacture problems otherwise your radio and computers (ECU) will also be affected if the car somehow putting out more than 12V.
This is Typical around this YEAR, if the Blower Resistor Is ok they should give you a Few Years service. The VOLTAGE READINGS Are GOOD that your Friend Checked. Be Sure the GROUNDS are RENEWED on these Vehicles as POOR GROUNDS are Pretty Typical for failure also around that Year
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