Problem with my 1999 Chevy Astro Cargo Van
Mileage = 119,000
Engine size = 6 cylinder
Repair work done prior = Replaced blower motor resistor assembly
tip/donation yes
GM tech = JK
question = The a/c blower motor was working intermittently so I went on line and found most
problems were pointing to the blower motor resistor assembly. I replaced this part and it was
fine for a few days. Since then it has been an electrical mystery. As it stands, the blower
doesn't work most of the time. Here's the weird part: When I start the van, the ABS light
comes on and the fan doesn't work. However, sometimes it starts with the ABS off and then
the blower does work, but if you change the fan speed the ABS light comes on and the fan
stops working again. Also, the check engine light has come on a number of times but
always turns off at some point. By the way, I have actually changed the blower motor
resistor twice. When I had the problem initially I don't remember any problems with the dash
indicator lights so after I installed the new part and had the problem with the lights I thought
the new part was bad so I installed another new one but have the same problem!
s. Also, when the blower is working you can change the temperature and vent settings
without any problems but as soon as you touch the fan speed control the fan stops working
and, again, the ABS light comes on. I live in Arizona and need the a/c (by the way, when the
blower is working the a/c compressor, etc. works fine) This is driving me nuts, please help.
Thanks... Jay
P.S. The new part I installed was a different version (supposedly updated)that was bigger. I
had no problem cutting the opening and securing it properly.
JK:
WOW, that is weird.
OK. First off, a bad resistor usually wont cause an intermittent operation. It usually will cause
1 or more of the speeds to not work at all.
Was the resistor a GM factory part? I am wondering that if this part was not correct for your
van, if could cause these things. It does not seem likely, but possible.
I would re-install the old resistor if you still have it, and see if the ABS light and fan operation
are the same as with the new resistor installed.
If no ABS light and fan operating as you described, i would suspect the resistor.
If old resistor has no change to the current condition, then i would have to say this is either a
faulty fan drawing too much current and you have a couple of wires melted together
somewhere causing it to backfeed to the ABS indicator, or a ground problem for the fan. A
faulty ground would cause the fan to try to find ground through another circuit, possibly
causing the ABS light.
I will send you a few schematics shortly.....
Mileage = 119,000
Engine size = 6 cylinder
Repair work done prior = Replaced blower motor resistor assembly
tip/donation yes
GM tech = JK
question = The a/c blower motor was working intermittently so I went on line and found most
problems were pointing to the blower motor resistor assembly. I replaced this part and it was
fine for a few days. Since then it has been an electrical mystery. As it stands, the blower
doesn't work most of the time. Here's the weird part: When I start the van, the ABS light
comes on and the fan doesn't work. However, sometimes it starts with the ABS off and then
the blower does work, but if you change the fan speed the ABS light comes on and the fan
stops working again. Also, the check engine light has come on a number of times but
always turns off at some point. By the way, I have actually changed the blower motor
resistor twice. When I had the problem initially I don't remember any problems with the dash
indicator lights so after I installed the new part and had the problem with the lights I thought
the new part was bad so I installed another new one but have the same problem!
s. Also, when the blower is working you can change the temperature and vent settings
without any problems but as soon as you touch the fan speed control the fan stops working
and, again, the ABS light comes on. I live in Arizona and need the a/c (by the way, when the
blower is working the a/c compressor, etc. works fine) This is driving me nuts, please help.
Thanks... Jay
P.S. The new part I installed was a different version (supposedly updated)that was bigger. I
had no problem cutting the opening and securing it properly.
JK:
WOW, that is weird.
OK. First off, a bad resistor usually wont cause an intermittent operation. It usually will cause
1 or more of the speeds to not work at all.
Was the resistor a GM factory part? I am wondering that if this part was not correct for your
van, if could cause these things. It does not seem likely, but possible.
I would re-install the old resistor if you still have it, and see if the ABS light and fan operation
are the same as with the new resistor installed.
If no ABS light and fan operating as you described, i would suspect the resistor.
If old resistor has no change to the current condition, then i would have to say this is either a
faulty fan drawing too much current and you have a couple of wires melted together
somewhere causing it to backfeed to the ABS indicator, or a ground problem for the fan. A
faulty ground would cause the fan to try to find ground through another circuit, possibly
causing the ABS light.
I will send you a few schematics shortly.....
