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Yes there is, but it only operates the high speed function.
I believe you have a relay that runs the high speed for the heater fan motor. The relay should be located in the power distribution box under the hood.
Check the low speed relay and the resistor at the motor
same as low speed relay its call fan mode
do you mean the speed of the fan? if so, it'a relay generaly near the motor of the fan. If it's the heat who only came at high speed, you need to add some antifreeze.
It could be the high speed heater motor relay is stuck on or the switch itself is broken.
If only high speed is effected check the high speed relay and/or the fan switch/electrical connections for problems.
There should be a smaller plastic box behind the fuse box in the engine compartment. There you will find the high speed fan relay as well as the low speed fan relay.Good Luck
Most heater blaower motors have 2 relays: 1 for speeds 1-4 and a high speed fan relay for 5th speed I do not know what kind of vehicle or location of relays Most heater blaower motors have 2 relays: 1 for speeds 1-4 and a high speed fan relay for 5th speed I do not know what kind of vehicle or location of relays
A fan or cooler relay is used in electrical furnace to change the blower speed to the blank speed for cooling
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 switch had a meltdown or the high speed relay is stuck.