Normally the problem is heater resistor underhood ,or a/c relay stuck on . it could be more complicated if you have a Riviera with touch screen for radio ,a/c control, an other.
SOURCE: 1996 buick riviera blower motor will not shut off
The blower motor control module needs to be replaced, that will solve the problem. The module is underneath the hood on the firewall in the back. It has 2- 6mm screws. Unplug it, pull it out, put the other one back in. Plug it in. This is common for this model buick.
SOURCE: heater fan won't turn off.
Unplug the blower resistor/relay, If the blower quits replace it.
SOURCE: Air conditioner/heater blower fan on 1997 Buick
it will be hard to diagnose with out having my hands on it but try this.
this vehicle is known for blower motor resistor failure.
under the dash on the passenger side next to the blower motor there is a resistor attatched to the blower motor case it will have a single plug with 5 or 6 wires in it, they are normally within a couple of inches of the blower motor, remove this resistor and look at closely for any signs of burning this is a common problem, you can buy one at any parts house, do not operate the motor with the resistor removed from its mounting hole or you will damage it.
if the resistor looks good than purchase you a test light and drop me a line and i will explain how to test the entire system its not hard to do.
[email protected]
SOURCE: My heater in the Mercedes c240 1999 car is not
the control valve unit behind the dash either broke or stuck. the car has two set of control valves, one for passenger and on for the driver. It common for the unit to fail on all cars some has better luck than others. inside of the valves made out of rubber, over time if it not move regularly it can seized from heat and it get stuck and the motor may have a hard time turning and adjust the valves itself. the only way to get to it and work on it, the dash has to come apart. the part may be cheap if it need it, the bad part is time consuming getting to it and its all mechanic nightmare and the labor will get you. The fan keep coming on, you may have to change the thermostat switch sensor, it could be faulty and not sensing correct temperature causing the fan to stay running. at the same time I would go ahead and have the thermostat it self change, you will have replace that soon or later and you don't want the car leaving you stranded and overheating. by running the heater believe it or not, it also help cool down the the engine a bit. hope that help some
SOURCE: MY HVAC fan stopped blowing. Checked all the
Check the blower motor speed control resistor pack is ok.
(The resistor pack is usually located in the blower fan ducting in the air flow).
Check condition of electrical connection terminals on the blower motor circuit - these terminals pass considerable current and over time may fatigue overheat and loosen.
Check operation/replace any blower motor control relay,
Check the blower motor will run if +12v directly applied to the blower motor.
Check operation of the blower motor speed control switch is ok.
123 views
Usually answered in minutes!
×