My 94 Ford F-150 4.9 my belt squeaks when I turn my heat on and go away when it turned off my battery volts go down what's wrong you think?
My 94 Ford F-150 4.9 my belt squeaks when I turn my heat on and go away when it turned off my battery volts go down what's wrong you think? - 1
It's a ford, what do you expect?
The major problem is your grammar, don't know what you are asking.
Flush the coolant and heater core and replace the water pump pulley. Check alternator output voltage.
The belt slips.
Hi nothing wrong with except what you expect from a 94 ford truck which is now well passed it.
Your fan belt has become hard and glazed with age. It slips when you draw too much electricity ( for example turning on a heater fan ) or give it too much load in other ways.
It might be possible to tighten the belt but this can damage bearings. It would be wiser to fit a new belt and let the soft grippy surfaces do the work rather than needing excessive tension.
Bad serpentine belt tensioner
Bad alternator.
One of the things wrong is your blower motor is worn out and is drawing a lot of amps and is putting a bigger load on the alternator, another problem is, you need a new belt put on it, sounds like the old one is dried out and slipping.
Could be your heater turns on A/C when motor cold to help engine warm up. See if compressor turns freely by hands when you jump clutch relay.
Also, see if blower turns easily--the end cap is on fire wall, no need to go inside and under dash. Belt could be old, see if idler turns freely. Water pump and alternator, too. If battery is marginal, it could bog down your alternator--try a new belt and alt's output voltage when headlights on.
A slim chance you have too small/too big an alt or battery for your engine/battery /accessories. That back EMF can load your engine. An old truck, especially second hand, may have a few junkyard parts that fit but not necessarily right for the application. (A friend put a car clutch in his '90 Ford 460 cu inch. It fit But it is wrong for a 12 foot bed dually with fifth wheel.
Does your belt tensioner move freely? Not the pulley, but the sprung arm? Sometimes the aluminum tensioner becomes corroded at the pivot point and will not move freely, so it can't keep proper tension on the belt, so the belt is loose and the alternator pulley slips and makes noise. A loose belt can't properly grip an alternator pulley, which wants power from the engine. So the voltage drops because you increased the electrical load and the alternator can't provide it.
Maybe your belt is old and worn and stretched and the tensioner can't tighten it.
It's a tensioner/belt problem. Have a closer look at them.
-General automotive mechanic since 1972
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