My '97 Merc Grand Marquise just started a loud ''tick tock'' sound that seems to be coming from behind the clock or the air conditioner/heater control panel. It keeps up a regular rhythm, like a clock, regardless whether the AC is on or not. Car speed doesn't cause it to go slower or faster. If it is the clock, can I just unhook it myself?
For about 2 weeks before this tick tick sound started, I had noticed a quiet little high-pitched ''whine'' sound coming from the same area.
This whine sound could not be heard when I popped the hood, only just from inside the car. Seemed to be coming from under the dash and that general clock area. I figure this sound evolved into the rhythmical ''tick tick'' loud noise I'm hearing now!
Who should I take it to for diagnosis? Is this something I can maybe do myself? Thanks.
If sound comes from under the dash, it might be an hvac actuator that is having a problem? Sometimes you can put your hand on it and feel the vibration? Sometimes with a relay, you can do the same thing.
SOURCE: HEAT/AC blower motor stopped working
It's even odd that you were getting a step-type voltage when you first checked.
Many speed regulators are simple tapped resistors with the switch selecting which tap is connected to the motor.
More elegant controls would use a semiconductor (transistor) and a few other components to supply step-variable voltage to the motor.
To determine which is used on your car, you will at least need the electrical diagram for it, preferably an aftermarket service manual - Haynes or Chilton should be available at least in the US and Canada.
Those will contain not only the electrical info you now lack but possibly instructions that will aid in locating the controlling circuit.
I suspect that circuit is faulty; if the resistor type, it will be a device with mulitple taps, if solid state, a few parts on a small board.
SOURCE: high pitch squeaking noise at idle
you might need a stethiscope to hear where this is coming from could be a idler or maybe the tensioner or maybe the alternator .. none of these would bother power
SOURCE: I have a 1998 Mercury Mountaineer,the check engine
If the check engine light is flashing it means you have a serious miss-fire that may cause damage to catalytic converters. It is not recommended to continue to drive it in this case. Catalytic converters are very,very expensive.
Recommend to have it towed to a repair shop for evaluation.
SOURCE: i have grand marquise 2005..had a problem with A/C
You need to get your entire vacuum system checked.
The problem you are having is a symptom of another problem. The vacuum drop that is making your A/C controls change can affect the power brakes and all of the engine controls.
It can be a simple matter of a loose hose or broken plastic part. It can be a leaking part under the dash or under the hood. You will get better performance and mileage once this is fixed. The A/C may work perfectly when this problem is fixed.
You may hear a hissing sound while the engine is running and that is what needs to be fixed.
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