Yes there is, but it only operates the high speed function.
The heater fan relay switch can be found on the firewall in the engine compartment. The relay switch will be on the passenger side of the firewall.
The 2002 Chevrolet trailblazer heater fan relay switch is located behind the dashboard. The relay switch will be on the drivers side of the vehicle.
Fan (heater/air conditioning) relay switch
Under hood fuse panel box. It is labled "Cooling Fan". To easily check it,swap it out with the "heater blower fan" relay and see if the heater blower works. Both relay's are made the same.
It could be the high speed heater motor relay is stuck on or the switch itself is broken.
could be the resistor (relay). Did the fan fail all at once or did it work on a "speed" and not others? My friend has a "Ford" and he replaced the switch AND fan motor before finding out it was the "relay" switch.
The heater/AC fan has no relay just a switch. The Radiator fan relay is mounted next to the battery. It has 2 plugs and starts based on radiator temp and AC pressure.
Relay is on heater/AC ductwork under hood on passenger side of engine compartment
Where is the heater relay switch on a 2005 MalibuRead more: Where_is_the_heater_relay_switc
Where is heater control switch
location of the fan relay switch on a 1989 Chevy Corsica
The cooling fan relay switch can be located on the back of the cooling fan motor. The relay switch should be labeled as such.