Question about 1987 Nissan 300ZX
Heater blower stopped working. Pulled the blower and it tests ok but at the input terminals I read .15 V with the computer controller on economy with low fan and .46 V when on high fan. I traced the wiring up to a relay/diode combination above the glove box. Wondering if anyone has experienced this and can identify whether the relay or diode assembly would be faulty or if its something else.
When you tested the voltage they mean basically nothing without a load. No automobile fan will run at 1/2 a volt. Put the blower back into the circuit and retest the voltage. If you did indeed check with the blower in circuit, you do have a problem with the supply voltage. I would need to know what make, model and year to tell you more. As a temporary fix, you can rig a switch to the blower to supply 12 volts directly to it. It will run on high whenever you have it on, but it will work until you can trace back to where the problem is.
Posted on Feb 08, 2009
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faulty blower motor resistor. The low and medium speed on blower motor is
controlled by resistor and its actual speed is high. So because resistor is not
working, blower motors actual speed which is high is working.
can be faulty blower motor or faulty blower motor resistor. Get the blower
motor inspected. If it's faulty it has to be replaced.
blower motor testing and replacing, check the link below: ----
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