SOURCE: A/C and/or heater only blows very hot air
when the a/c is running you need to check if the lines coming out of the evaporator are cold. if they are cold the blend door operation could be an issuse. if they aren't cold the a/c is not working and you have to start diagnosing that.
SOURCE: '03 Merc Mountaineer humming noise when turning
If same tires as before & air pressure set correctly, or as usual, a humming when swerving, or turning one way or the other or both, it's usually a pretty good indicator.
SOURCE: bad grinding noise
The problem is likely the transfer case has locked up, the question is do you need it to continue to be an AWD vehicle? If not a simple solution is to remove the driveshaft from the transfer case to the front differential case. Takes maybe 15-20 minutes and there are no leakage issues by doing so. The vehicle will now be a rear-wheel only drive one. I recently did this to our own 2003 model and as the car stays in the south, there is no need for the AWD. The car performs as expected and that binding problem is gone.
SOURCE: I have a 1996 mercury
Wow you change everything, TPS was right thing to do and so is the Idle air control,and MAF and EGR, fuel pressure, So it idles high then some one tried to defeat the stall in gear? Even if there is a vacuum leak creating high idle it shouldnt stall in gear, , What color is the transmission fluid? when in gear in drive step on the acelerator pedal to maintain idle to prevent car from stalling. Just enough to maintain let say 1100RPM. Is there a vibration? I mean a torque convertor vibration. Torque convertor stall are common an GM and Nissan,very rare do I ever see it on Ford. I really belive the IAC is not getting power and is just been adjusted manually, cause I know its not the transmission, At idle in gear pull the plug on the idle Air control does it change in idle setting? If it doesnt change in Idle setting the adjustment that was use to control the setting lower the idle to its normal setting. Plug the idle air control in then.The idle air should change the setting. If it doesnt its not getting the signal it should.
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