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Climate Control Problems (Air Conditioning, Heat) - All Cars

791 messages,  Last post on Aug 12, 2009 at 12:55 PM

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What is this discussion about? Heating / Cooling


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#730 of 791
Re: heater goes on and off [astroman3] by kiawah
Jan 15, 2009 (6:28 am)
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Replying to: astroman3 (Jan 15, 2009 5:21 am)

Is it the heat (temperature hot vs. cold), or the blower (fan speed)?
 
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.
#731 of 791
Re: heater goes on and off [kiawah] by astroman3
Jan 15, 2009 (9:55 am)
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Replying to: kiawah (Jan 15, 2009 6:28 am)

sorry i wasnt more clear,the heat is fine its the blower that stops n starts at will,it just kicks on when it wants to or i hit a bump? its intermitent,its on one minute and off the next,not sure if a short or lose connection???
#732 of 791
Re: heater goes on and off [astroman3] by kiawah
Jan 15, 2009 (10:17 am)
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Replying to: astroman3 (Jan 15, 2009 9:55 am)

check the resistor bank
#733 of 791
Re: heater goes on and off [kiawah] by astroman3
Jan 15, 2009 (10:35 am)
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Replying to: kiawah (Jan 15, 2009 10:17 am)

were would that be located and what am i checking for....
#734 of 791
Re: heater goes on and off [astroman3] by imidazol97
Jan 15, 2009 (10:40 am)
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Replying to: astroman3 (Jan 15, 2009 9:55 am)

Another possibility is the blower motor is wearing out. It doesn't make contact at times and bumps and vibration will allow the brushes to make contact again. The more it wears the worse it will get.
 
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.
#735 of 791
Re: heater goes on and off [astroman3] by kiawah
Jan 15, 2009 (10:53 am)
Reply

Replying to: astroman3 (Jan 15, 2009 10:35 am)

Inside the car, up on the firewall, typically on the passenger side, you'll see a squirrel cage blower motor shape. You should find at the output plenum of that blower motor, some wires going in which attach to a resistor bank. Pull that out, and visually check to see if the wires are all connected. If they are, then check is with a ohmmeter.
#736 of 791
Re: heater goes on and off [kiawah] by astroman3
Jan 15, 2009 (11:16 am)
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Replying to: kiawah (Jan 15, 2009 10:53 am)

thanks for the replys,,it makes sense on the blower motor contacts,im sure its more that then the resistor bank as i think if the traces burnt or something along that line it would just quit,but the motor brushes not making contact due to wear makes sense,,,how hard is the job and about how long to do the blower motor swap from start to finish,,on a scale of difficult 1-10 how hard is it????
#737 of 791
Re: heater goes on and off [astroman3] by imidazol97
Jan 15, 2009 (12:28 pm)
Reply

Replying to: astroman3 (Jan 15, 2009 11:16 am)

I do not know where the blower fan is on an Astro, whether it's accessible from under the hood area or from under the dash probably on the passenger footwell side.
 
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.
#738 of 791
Re: heater goes on and off [imidazol97] by astroman3
Jan 16, 2009 (7:44 am)
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Replying to: imidazol97 (Jan 15, 2009 12:28 pm)

ok after further investigation i found out,that in fact it is running but while on hi,it will drop out and sound like it quits ,but in fact it is on low,,so its going from high speed to low speed on its own,so maybe the resistor pack you mention? , and were is that located? ,same place as the motor? ,someone said the motor is behind the wiper n radiator refill bottles,and have to remove the headlight to get to?,,can anyone verify this? ,its -14 degree here lol and dont wana waste alotta time out there,thanks to all....

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