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The fault you are describing with your 1999 Buick Park Avenue is most commonly caused by a failed temperature door actuator. I would classify that as a mechanical problem. I would recommend that you have the problem properly diagnosed before attempting any repairs. Please use the following link to find a shop near you http://repairpal.com/directory?address=37772&car_brand_names=Buick
The leaking components should be replaced. It is not that uncommon for the "hydro=boost" units to leak on vehicles of this type.
The lower control arms are the bottom suspension prices on your 2003 Toyota Avalon. They connect the lower part of the steering knuckle (that is the vertical piece behind the wheel) to the vehicle frame. The bushings are at the connection to the frame and are fairly well hidden from view. Depending on the suspension design there are one or two mounting locations on the frame on each side of the vehicle, one bushing at each location. The place to look to see if the work has been completed would be the bolts that mount the control arms to the frame. Look for wrench marks on the bolt heads and nuts.
It sounds as if the tachometer gauge in your 2005 Buick LeSabre has failed internally. If that is the case the complete gauges "cluster" will need to be removed and send to a specialty repair shop. I would guess repairs would be in the $350 to $450 range.
The vehicle speed sensor should be located on the tail shaft housing of the automatic transmission of your 2007 Chevrolet Suburban.
I cannot send a picture with the specific bolt tightening sequence for the intake manifold on your 1992 Chevrolet G Van but some general rules are as follows. Start from the middle (center) , working toward the outside edges in a circular pattern. First pass should be about 75% of spec, followed by two more passes at the final spec.
Your 1996 GMC Sonoma does not use an "auto switch" for the fuel pump. The relay is controlled by the powertrain control module. Power comes from the ECM/BATT fuse in the instrument panel fuse box. Power is supplied from the fuse to the fuel pump relay in the relay center (not sure where that is). When the PCM commands the relay on, power is sent from the relay to the fuel pump. You will need to diagnose why no power is getting to the fuel pump.
With the check engine light on a fault code has been stored in the engine control module of your 2005 Chevrolet Aveo. The fault code can be retrieved with a scan tool or code reader. The fault code should be properly diagnosed and the cause repaired before resetting the light. For more information please use the following link - http://repairpal.com/check-engine-light
The spark plugs in your 2005 Chevrolet Malibu are located under the ignition module/coil assembly on the top of the engine.
Chances are some valves were damaged when the timing belt broke on your 1994 Honda Accord. Have you performed a compression check?