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Originally Posted by JoshBarber
Wrong fan slick. Read the whole post before you give information that may confuse a situation further. It's the BLOWER FAN that I was suggesting they check. Which has NOTHING to do with the engine cooling fan you're talking about.
To return to my original statement...you can hear the blower motor if its working by just turning the fan on HIGH with the engine running. If theres a bunch of cold air blowing out of the vents you know its not the fan motor. In which case it's likely that its the heater core...or thermostat as I said.
My next suggestion if its not the blower motor, would be to feel the coolant hoses running into the heater core. see if they're both hot. If the leaving line is colder than the return line, chances are that its blocked or leaking somewhere. The cheapest easiest fix for this will be the thermostat...so cross your fingers.
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I'm not talking about the motor fan. The motor fan is not electric, in my truck at least, so that could wind up lethal. Open the hood, go to the passenger side of the car, there is a cylindrical motor sticking into the black plastic near the firewall, there should also be a 3 wire plug sticking into said cylindrical shape. . .
TAP on the BLOWER FAN MOTOR. That's what I was suggesting. Do this while the vehicle is running with the heater on and the fan speed all the way up. Just tap it lightly, it should start right up. If it starts up, it's that motor that's bad, or something related, like wiring. If it doesn't, then you should use a test light on the wires leading to the fan to make sure the power wires are getting power and the ground is properly grounding. Also, be sure you check the relay and fuses for it, that's always the first thing I check.
I never mentioned hitting the engine fan, because in my truck, if I tried a stunt like that, I'd be dead. My 4.3 V6 has a mechanical engine fan. Thanks to those of you who stood up for me, I am just trying to help out, and I really don't feel like making enemies here before I make it into the double-digits (post-count wise, that is. . . lol) I hope my newly revised tip helps you figure out what's causing the problem, let us know if it works. My blower fan motor is bad, so when I start up the truck and it doesn't work, I pop the hood, tap on the motor with my ice scraper or anything else I have handy, and it usually starts right up. I'm replacing it Sunday, so it should be alright until then.