A few times now I start the car and the blower motor won't come on in several cold conditions. Drive a little bit and it comes on but this morning with temp @ -30, my wife drove an hour and froze as the fan would not come on. Is there a way to put a light switch or something to keep the blower fan on?
Replace your ignition switch, very common problem
Rather then rigging it , fix it right ! The blower motor could be bad . Testing the electrical circuit , checking current draw , voltage drop . etc.... Hooking up a light switch isn,t going to keep it on if parts are failing . More then likely the blower motor control processor is going bad . The blower motor is electronically controlled .
HVAC Blower Motor Circuit
https://www.1aauto.com/2006--pontiac-grand-prix-blower-motor-module-for-models-with-automatic-temperature-control/i/1ahbr00026?f=489143&y=2006&utm_source=bing&utm_medium=cpc&utm_campaign=Shopping%20Campaign%20F-L%20-%20Medium&utm_term=1100309270240&utm_content=F-L
SOURCE: 1999 Pontiac Grand Prix Overheating
I had trouble with overheating on my 2000 Grand Am, The dealer could not even resolve the issue,(they wanted to replace the intake gaskets)...I knew that was not the issue, no air leaks or water leaking there; so I sit down to think; what are the causes of overheating. Thermostat sticking - nope not it, water circulates, Water leak - nope not it, has water stays until it gets too hot and goes out overflow, fans working - yep...hummmm the only other thing I could think of was losing of water pressure, yep that's it - the cap on the coolant tank was going bad, got a new cap ($8.00) replaced the old one and no more trouble going on 6 months now.
Hope this may solve your issue.
SOURCE: 2000 grand prix day time running lights/blower not working correctly
Believe it or not, but it was a bad ignition switch. I the switch apart and found about 3 different and one in particular that were burned pretty bad. Must have been the circuit that controls the blower and DRL? Found the solution on another blog. I put a new switch on in about 1.5 hours. I does take a couple special tools, very small female torx sockets. Other than that pretty easy.
SOURCE: 2001 Pontiac Grand Prix GT multifunction switch problem?
I had the exact same problem, I changed the "ignition switch" because the contacts inside were burned, this is why you see all those troubles coming in and out at different moments. It costed me 150$ to do it myself, buy the switch on an online reseller, must cheaper than the dealer! Now everything is back to normal on my Grand Prix GT 99 exept that my headlights don't light up automatically when starting the car... I have to check my fuse/relay and switch to make sure everything is ok on that side.
Good luck.
SOURCE: Blower motor not working on 1999 Pontiac Grand Prix GT
The blowers vary greatly relative to accessibility; some are back-breakers and only removable from under the dashboard.
Make sure you don't have a blown fuse or failed relay; neither of these are costly and both easy to replace.
On the relays, there are often multiples of the same part number which allows for swapping to check for operation. They will have a part number that you can compare so you are sure you are putting the same part where it belongs when swapping.
> I can hear the fan kick on, but nothing else happens.
I assume you mean the cooling fan under the hood, not the AC/heater blower.
Most often, the blower will continue to function on the highest speed setting and this common problem is caused by the failure of a special stepped (tapped) resistor that is used to 'waste' some of the voltage therefore changing the speed of the blower.
I recommend that everyone have a cheap multimeter at home since these are now under $20 US and let any layman do some electrical checking without paying an expert.
Such a meter can be had at Radio Shack or any auto parts store and are easy to use.
Having one of these, you can often ferret out problems such as yours quite quickly and they are handy around any home as well.
SOURCE: 2001 Grand Prix: can't find the blower motor resistor on 2001 Grand...
Under the passenger side of the dashboard is a carpeted cover you'll need to remove. Once that's out of the way you'll see the blower motor on the RH side and just to the left of it right next to the frontwall is the blower motor resistor held in by two screws.
Here's a picture of the old design (right) versus the new design (left).
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