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The most likely cause is a bad blower motor resistor.
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∙ 9y ago
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Why does my 1991 Lincoln Town Car's AC and heater work at either full blast or not at all?
The problem is either the blower motor resistor or the blower speed selector switch.
My vectras heater fan only works on full its a 52 plate?
The blower motor speed resister may be burned out.
How do you check to see if front blower motor resistor on a 2004 dodge grand caravan is bad?
Usually if the resistor is bad the heater will only run on full blast.
What is wrong with your Climate control heater works only on full power setting but not on automatic or lower settings Vectra CDX?
Defective heater blower motor resistor pack.
What could be causing the heater blower motor to work only in the full blast switch setting - 1988 Suburban?
most vehicles have one circuit(and one fuse) for the first 3 fan speeds and a separate circuit and fuse for the highest speed.AnswerCHECK THE BLOWER MOTOR RESISTOR
Why does your GMC Canyon 2006 AC only working on full blast?
The blower motor speed resistor is burned out.
Why does your cars air and heat only work on full blast?
Either the blower motor resistor went bad or the blower motor speed control switch has gone bad.
What process is used to remove heat from an automobile radiator?
turn the heater on full blast, that will make use of the heater core to help cool things down.
Which one is the intake heater hose in a 1986 Nissan720 pickup?
Start the car, turn the heater/blower on full, The hose that is the hottest is the Inlet. The coolest is the Outlet.
The heater doesn't work in my '91 Toyota Previa. how would i fix that?
The heater or blower motor on my 91 previa works some time but has'nt now for the last month. I hear a humming sound that lasts for 10 seconds or so and then seems to kick out. It will do this twice with a gap of a few minutes in between when i start the vehicle in the morn.then it doesnt do this again until i let it sit for hours.i have heat but cant get the full effect because the blower wont kick in to circulate it. Also the blower only works on high when it works.any suggestions?
99 sunfire heater only works on full speed?
1) Check the blower motor, make sure it is not making any weird noises.2) Check the blower motor resistor, its located next to the motor. It is what controls the lower speeds of the motor. You can try to find one at the junkyard.
Heater in dodge 5.7 hemi starts out warm then cools down when you turn blower on high?
If the engine is at the proper temperature and the coolant is full, you have a restricted heater core.
