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Originally Posted by 06camarodude
To check the fan, simply start up the truck, open the hood, and tap the fan motor with the handle of a screwdriver, lightly, and if it turns on and stops working after you shut off the truck, that's the problem. If it doesn't work at all, it's probably not getting any power.
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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.