Question about 2008 Mazda Cx 9

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My cx-9 blower motor is running in the front but no heat is coming out

Then it works sometime

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Posted on Jan 02, 2017

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SOURCE: Front and rear blowers in my 2007 CX-9 are not working. Both A/C and Heat options don't make any difference. No air coming out of front and rear vents.

maybe a blown fuse

Posted on Jan 21, 2015

Testimonial: "Thanks for your response. Could you elaborate as there are quiet a few fuses related as per the manual: A/C MAG -> 10A -> Air conditioner HEATER -> 50A -> Heater R HEATER -> 40A -> Heater Are Front and Rear blowers working off the same fuse as both are dead? Appreciate your response."

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1 Answer

Heater and ac sometimes won't work til i drive for awhile


Many of those type trucks have a fuel gauge issue...I don't think it is in relation to your heat and cool problem...I know people have had to change the complete fuel sending unit assembly to fix gauge...It wasn't cheap...Should have been a recall but it wasnt...However I don't have enough info for the heat/cool problem...Is the blower motor running all the time or does it not run until you drive for awhile..?..Some blower motors that go bad won't come on until they are jarred or tapped with a hammer...Maybe it is vibrated while driving and finally comes on...You have to listen closely to make sure if it comes on when you turn it on...If it always turns on when you flip the switch then it sounds that your HVAC blend vent doors are very slowly opening...This could mean the door actuators are wearing out or the plastic vent doors are contaminated at the hinge and slowly opening.......So check the blower motor operation first...If it don't blow until you drive the motor is going bad...First make sure all fuses have a good connection..sometimes they vibrate out...Also blower motor relays.If a blower motor relay is bad the blower will not come on at all....A faulty relay will not work the fan at all....If the blower motor comes on when it wants to it has to be a bad motor or improper connection....Sometimes a motor will operate but doesn't blow..This could mean the fan has torn loose from motor....Best way to troubleshoot blower motor is remove it,inspect fan connection...,hold it safely in your hand while an assistant turns it on.....Good luck..

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{: ) If the front a/c and heater is working fine, that's good. At least the problem can be isolated on the rear HVAC circuits only.
Check first the RR HVAC fuse 30amp at the underhood fuseblock and the IGN 3 fuse 10amp at the IP fuseblock. If you found them good, then you can begin diagnosing the blower circuits wirings and connectors.
A faulty blower definitely will not give any output. If it doesn't spin for some reason, rear a/c or heating cannot be circulated.
A faulty blower resistor or speed control processor can also cause a zero air output. Sometimes, the blower may only work at certain speeds only.
A faulty rear HVAC control switch may not give the proper signals to the blower resistor or speed controller, and in turn will render the blower motor disabled.
Sometimes it can be a terminal connector being loose or burnt. However, the most usual cause for this type of problem is a faulty blower resistor.

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1 Answer

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I have the same problem. Sometimes it will blow out of the front vents also. I'm taking mine to the dealer on Monday.

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