logicon- heater/cooler out
10-25-12, 08:06 PM
#1
Full Member
Thread Starter
iTrader: (1)
Join Date: Apr 2011
Location: Oregon
Posts: 60
Likes: 0
Received 0 Likes
on
0 Posts
logicon- heater/cooler out
Hi everyone, I am very inexperienced with cars and my heater/cooler fan has stopped working. I replaced the logicon and that seemed to have worked but the next day the fan speeds went out again. 
I have no idea what to do.
I have no idea what to do.
10-25-12, 08:11 PM
#2
im seriously frustrated as hell and cannot think straight.
10-30-12, 08:11 AM
#4
Is the problem with the thermo-modulated fan or the electrical fan?
I'm gonna assume electrical fan for starters. Hook up a current to the fan (~2.5A; 12V should do it) and see if the motor runs smoothly. If you hear grating (fan moving slowly) or a hum (fan not moving), the fan needs cleaning. If the fan simply does nothing when powered, the motor is shot; replace the fan. If the fan runs smoothly when fed power, it's a problem elsewhere in your electrical system. Check the signal to the fan with an electric multi-meter. If the voltage is particularly low try cleaning your wire contacts including your grounding points. If you're not getting any power, it's likely a fault in your cooling fan relay or fan control unit. Go through the system backwards until you find a faulty component. Replace it, then try again.
If your issue is with the thermo-modulated fan, I don't think I can offer much advice on it. All I know about it is that it sits on a bearing that moves free when cool, offers slight resistance when warm, and clutches when hot. If that's the fan you're having trouble with, replace the thermo-modulated clutching system.
Best of luck to you getting it figured out.
I'm gonna assume electrical fan for starters. Hook up a current to the fan (~2.5A; 12V should do it) and see if the motor runs smoothly. If you hear grating (fan moving slowly) or a hum (fan not moving), the fan needs cleaning. If the fan simply does nothing when powered, the motor is shot; replace the fan. If the fan runs smoothly when fed power, it's a problem elsewhere in your electrical system. Check the signal to the fan with an electric multi-meter. If the voltage is particularly low try cleaning your wire contacts including your grounding points. If you're not getting any power, it's likely a fault in your cooling fan relay or fan control unit. Go through the system backwards until you find a faulty component. Replace it, then try again.
If your issue is with the thermo-modulated fan, I don't think I can offer much advice on it. All I know about it is that it sits on a bearing that moves free when cool, offers slight resistance when warm, and clutches when hot. If that's the fan you're having trouble with, replace the thermo-modulated clutching system.
Best of luck to you getting it figured out.
10-30-12, 10:17 AM
#5
In case you don't already have it, the factory service manual is available here.
Foxed.ca - Mazda RX-7 Manuals
Check the 'body electrical' section, under 'heater'. Intermittent failures tend to be electrical in nature. Check fuses, relays, wiring connections, then the blower motor itself. Could be as simple as a corroded connector or you may need to replace the fan motor. Pretty much impossible to tell without getting in there.
Foxed.ca - Mazda RX-7 Manuals
Check the 'body electrical' section, under 'heater'. Intermittent failures tend to be electrical in nature. Check fuses, relays, wiring connections, then the blower motor itself. Could be as simple as a corroded connector or you may need to replace the fan motor. Pretty much impossible to tell without getting in there.