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Hey all! New to this forum. We have a 1995 Honda Civic. Fan switch is in the "off" position but the blower motor will not turn off. Blows hot air all the time. Don't care about whether or not the a/c works or not - looking at how to trouble shoot - Im tired of hearing my husband complain about it. Last time we took it to a mechanic he complained because the car is old, so I'm trying to trouble shoot it myself. Cause, cmon - Its a 1995 with 70k miles on it, would you get rid of it?? I'm handy, somewhat auto savvy, but its not something I do every day. Any ideas to trouble shoot? Any help would be appreciated.
Well, that system is pretty simple. It consists of the following:
Fan speed switch
Blower motor resistor
Blower motor
First thing I'd start with is checking the blower motor resistor. This guy is behind the glove box an held down by 2 Philips screws, This is what it looks like
You didn't mention if the fan speed switch actually adjusts the speeds or not. Does it? Or does it only run on the highest no matter which speed it is set on?
For what it is worth, this part goes between $12-16 dollars on RockAuto. It is super simple to replace.
Im going to take a look at it. Husband said it used to turn off when he slammed the glove box closed so I think we're going in the right direction. Really - thanks so much for the guidance. Checking out local shops now.
The resistor won't do this. You have a wire shorted to ground (the switch and resistor are in the ground side of the circuit). The resistor can't short to ground since it is mounted in plastic. Take the glove box out, turn key on with fan switch off, and wiggle the wires coming from the motor to the resistor and then to the switch till you get it to stop. Localize the problem then repair with electric tape etc.
Hot air coming from the vents with the lever on cold means that you need to adjust the cable that operates the water valve under the hood. It should push all the way out and close the valve fully to shut down the heater core when the lever is on cold.
Of course you can work around this by just pulling the plug on the blower motor in the summer time.
Hot air coming from the vents with the lever on cold means that you need to adjust the cable that operates the water valve under the hood. It should push all the way out and close the valve fully to shut down the heater core when the lever is on cold.
The flapper doors if broken could potentially do this same behavior. Usually tends to only blows cold air no matter what heat setting you have but if two of the flapper doors are broken and stuck in the open position, it would only blow the air temp of the heater core.
In my case only one flapper post was broken so the second one would close the first one and I could not get heat unless I reach under the center dash and manually turned the broken post to open. That being said, I know that two posts could be broken and the flaps be open. Highly unlikely but still possible.
Under the center dash is the air flow control box, underneath it you should see a 4 prong actuator, 2 or 3 of which have white plastic slider switched on half moon posts. Those half moon posts are the flapper door posts. If those posts are broken, the flapper doors won't move and air flow won't be diverted from or through the heater core depending on their stuck position. Unfortunately, the only fix for this kind of problem is to remove the heater core section of the system and replace the box the heater core resides in. This is a bit more involved and requires removal of the dash.
You can see a post where I posted the FSM pages about this specific problem for more details on where/what to look for. A simple visual inspection of the 4 way level under the flapper box will remove this possibility from the equation.
1995 Civic Blower Motor won't turn off
