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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

What is this discussion about? Heating / Cooling


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#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)
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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)
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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....
#740 of 791
Radiator fan (AC related) on 97 Accord fails intermintently by techman41973
Apr 19, 2009 (4:01 pm)
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I have a 97 Accord with about 280K. Often the AC compressor will shutdown (most likely from overheating), mostly when I am driving low speeds or idling. On the freeway I NEVER have this problem. Engine coolant temperature and coolant levels are fine. I discovered that EVERYTIME I have this problem, the accessory (2nd) radiator fan isnt spinning. I believe its this fan that helps cool the AC evaporator. If I move the blades with a pencil, they do start spinning. Which means the fan is getting electrical power. The bearings are probably starting to go. No doubt I need to replace this electric fan. I need to postpone this repair if possible. I tried spraying a bit of WD40 in the motor armature. It didn't help. Is there anything else I can spray in there that could help extend the life of the fan?
Thanks
#741 of 791
Re: Radiator fan (AC related) on 97 Accord fails intermintently [techman41973] by kiawah
Apr 19, 2009 (4:08 pm)
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Replying to: techman41973 (Apr 19, 2009 4:01 pm)

Doubt that any spray will work.
 
If you can't afford a new replacement motor, you may want to check a junk yard to see it they'd sell you a fan motor.
 
Or don't use the A/C during low speed.

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