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This is a 1999 Malibu.
This is my wife's car so I'm rather baffled as to why this behavior is
occurring. It seems that once it gets hot outside, say over 90 degrees or
so, and the car is sitting in the Texas sun the blower motor won't kick in.
This occurs whether it's the air conditioning or the heater is switched on.
The blower motor seems to work fine in the mornings and late evenings but
not at any other time. There are no scary or anomalous noises when the
blower is running nor does the blower suddenly kick off while the car is
running. I've checked all the fuses and even replaced them with no luck.
She's had the blower motor replaced about two years ago for some reason but
the blower motor does work when it's (relatively) cooler out.
The A/C unit is blowing cool air even when the blower motor not running. I
can verify this because when the car is moving above 25mph the cold air
does exit the vents. (could it be a vacuum problem and the vents aren't
opening?)
I'm not sure what other information would be helpful at this point but feel
free to throw out any questions if I'm not clear.
cujo
hmmm, interesting problem. My first thought is that the temperature sensor
is bad. Not the one for the engine but the one that measures outside temp.
Does the car have an automatic climate control? Does it show you the
outside temperature? Pay attention to what it reads, if it is giving a far
off reading that is the problem.
My 98 Gran Prix did something very similar to this a few years ago. The
sensor is not very expensive and is easy to change. My was located on the
radiator support.
corbett_auto
No automatic climate control. I'm starting to think the switch in the
dashboard/console that regulates the speed of the blower is the culprit.
I'm trying to figure out how to get that apart easily to see if that's
what's doing it and possibly running a jumper wire to see if that's what is
the problem.
Since it's complaining whether I use the A/C or the heater and it's working
sporadically, I'm assuming a worn or loose connection.
cujo
There's a part that hooks up to the blower motor called the "resistor
pack". I'm going to look and see where this part can be obtained and how
it's installed.
(you never know)
cujo
I doubt it is the resister pack if it does not work in any speed when it
decides not to work. In most cars it by-passes the resisters when on high
as it goes through a relay. If it stops working in all speeds follow the
power as it travels from the fuse box to the switch. If the power is good
then it could be the switch.
corbett_auto
