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Maintenance & Repair Climate Control Problems (Air Conditioning, Heat) - All Cars
791 messages, Last post on Aug 12, 2009 at 12:55 PM
You are in the Maintenance & Repair Forum. Your Host is mr_shiftright
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Replying to: securitya8 (Nov 30, 2008 10:14 pm) 
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hello i have a 96 astro that heat works well,the front heat i guess blower will come on and off at will,the rear works perfect,,,when the front heat comes on it works great,then will just go out at will,,now that its freezing out,you really notice it,,any idea were to start,to find the issue??
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Replying to: astroman3 (Jan 15, 2009 5:21 am) If it is the latter, the blower fan speed, then check the blower resistor bank which is usually in the air plenum, right at the output of the blower fan. The design typically uses the air from the blower fan, to cool the resistors which get hot. That resistor bank is what gives you the different blower speeds (controlled of course by the blower switch). If one of those resistor wires burns out, you'll get weird motor speed problems.
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Replying to: kiawah (Jan 15, 2009 6:28 am)
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Replying to: astroman3 (Jan 15, 2009 9:55 am)
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Replying to: kiawah (Jan 15, 2009 10:17 am)
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Replying to: astroman3 (Jan 15, 2009 9:55 am) And check the connectors on the wires to motor. Heating will often burn the plastic connectors or the metal contacts causing them to make and break connection because of poor contact. |
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Replying to: astroman3 (Jan 15, 2009 10:35 am)
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Replying to: kiawah (Jan 15, 2009 10:53 am)
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Replying to: astroman3 (Jan 15, 2009 11:16 am) If it's the typical GM setup the power through resistors may kill one speed or more of the lower speeds depending on where in the series the break occurs. However the high speed is usually controlled by a relay and doesn't go through the resistors because of the high amperage draw involved. So if the problem is resistor pack, switching to high usually will work fine. You hadn't mentioned that so I suspected the blower motor. Ideal is if it won't work and you know where the motor is and you can tap it gently with a hammer or a screwdriver handle and it starts moving with the vibration making contact. Good luck. You might post in a group related to Astro vans to have someone tell you where the blower is located.
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