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Help identifying cause of heater blower fan failure
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ChipRivers
New User
Jan 18, 2014, 6:36 AM
Post #1 of 4
(4284 views)
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Help identifying cause of heater blower fan failure
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2008 registration
Citroen
C4 Grand Picasso
1.6
36000 miles ish
Hi all. The heater blower fan in my above vehicle has failed, I believe due to water ingress into the system. I have removed the fan motor and dried out hoping that it would rectify the problem but it has not :(
I need some help pinpointing the failed item which I believe could be either the fan motor, the resistor pack mounted on motor, or the power supply / control feed.
I have a multimeter but will need instructions on how to use to test this.
The control panel on dash appears to be working as the lights are coming on and other components sound like they are responding to the controls, it is just the fan motor that is not working.
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nickwarner
Veteran
/ Moderator
Jan 18, 2014, 3:58 PM
Post #2 of 4
(4255 views)
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Re: Help identifying cause of heater blower fan failure
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How did the water get in there in the first place? Did this car get flooded? Leaking windshield?
You need to see if there is power and ground at the plug for the fan motor. If you have that, your blower motor is bad. If you don't you'll have to go further back to find out what is going on. If you have water getting in here, you will have major electrical issues and you need to get that leak stopped asap.
Unfortunately I can't give you any specific info as that brand of car isn't sold in the US where this site is based. Because of that I have no access to tech info for it.
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nickwarner
Veteran
/ Moderator
Jan 20, 2014, 7:12 AM
Post #4 of 4
(4211 views)
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Re: Help identifying cause of heater blower fan failure
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Saw your locked post on testing this. You were testing right. The wire that showed 0 ohms of resistance between it and ground was your ground wire and tested out good. You had no voltage on the power wire, so you know you are not getting power. Now you need to find out why. Start by testing at the fuse to make sure it has power to it and the power is getting through. At the resistor, you should have power coming in on at least one spot. You will want a wiring diagram to figure out which wire is which. If that has no power you'll be going back to the switch itself if this is a manual system.
Please note that if this has some sort of electronic temp control you will likely need a scan tool with bi-directional capability to see what is going on and do testing. In that case you would need to take it into the shop. I would think the water getting into this almost certainly caused the issues you are having now, so do be sure to keep the drains clear of debris to prevent a repeat of this. As you're finding out, chasing down electrical problems isn't a lot of fun.
If you do find that you get power to the resistors, do ahead and pull it out. I'd bet its pretty nasty with corrosion from the water and time to replace it. If you need to fig up a fan or something to blow into the heater box when the fan is unbolted do so to dry out the vents and heater box area. If left damp it will grow mold and you will be breathing that in when the heater is on, plus the moisture will wreck the new parts you put in.
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