New blower motor, one speed only? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 7 Old 06-01-2012, 08:53 AM Thread Starter
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New blower motor, one speed only?

Just bought a 98 gt and the guy had the heater core replaced along with the blower motor. Issue is the blower only works on low speed. If you turn it on high or any other speed it still only blows on low. Would that be a motor issue or the switch its self? I think he said it worked ok for a month or two then did this.

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post #2 of 7 Old 06-01-2012, 09:34 AM
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It sounds like a switch or blower resistor issue. The blower motor itself only has one setting which is hi and the blower resistor drops power to slow it down.

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post #3 of 7 Old 06-01-2012, 02:16 PM Thread Starter
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Ok is there a way to narrow it down to either one? Or trial n error
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post #4 of 7 Old 06-01-2012, 07:04 PM
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Only if you have a volt meter
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post #5 of 7 Old 06-01-2012, 07:25 PM Thread Starter
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Quote:
Originally Posted by Goats View Post
Only if you have a volt meter
i have one what would i need to test exactly?
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post #6 of 7 Old 06-01-2012, 07:48 PM
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OK, if you look at the wiring diagrams, there's no logical way that a bad blower motor switch could create the OP's symptoms. However, a shorted blower ballast resister could.

To test the blower resister with an Ohm meter, verify there is 1.3 Ohm between terminals 4-3. Between 3-4 should be 0.5 Ohm. Between 1-2 should be 0.5 Ohm.

Or just look at it. Usually the rust through or bunt appearance is a dead give away.

I would also double check that the blower runs at full speed if the blower resister #4 (O/BK) is grounded. Be sure to use a solid ground because the blower needs a lot of current. If the blower does not run on full speed, then consider the blower may have bad bearings.

Last edited by wmburns; 06-02-2012 at 09:46 AM.
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post #7 of 7 Old 06-02-2012, 09:36 AM Thread Starter
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thank you sir!
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