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In many cases a long extension and a swivel socket is needed to reach and remove nut and/or accessories may need to be removed to gain access. Once all nuts have been removed it may be possible to tilt booster and access locking clip. A small tip screwdriver or a pick can be used to remove licking clip.
When a transmission starts to slip gears it is usually caused by internal problems. Automatic transmission is electronically controlled. Shifting is controlled by Transmission Control Module. It would be best to have your local repair shop perform a diagnostic of computer control system with the aid of an automotive scanner and perform road test to diagnose transmission slip.
Kia has a Technical Service Bulletin (TSB) regarding Automatic transmission Problems. Reference number : General KT2005022530, Date of Issue : May 01,2006. Contact your local Kia Dealer for a Diagnostic Worksheet under General TSB number. Metal shavings in your transmission oil indicate worn internal metal components.
A bad front Hub wheel bearing could cause Humming noise you are describing. Removal of brake calipers and brake disc are required to inspect wheel bearings. You might want to have your local shop test drive vehicle for possible bad Hub wheel bearings. Hub Wheel bearings are not adjustable. Whenever bearings are removed, replace with NEW bearings and bearing oil seals.
To perform heater core replacement requires the aid of special tools and equipment. If equipped with A/C it needs to be discharged to remove evaporator/heater case. It would be best to have your local shop perform such repairs.
Whenever diagnosing for vibrations, the first items that should be checked are ; worn and/loose suspension components, axles, tire pressure and condition, broken engine / transmission mounts, clutch judder. Typically rear brake vibration is felt at lower speeds. It would be best to have local shop perform inspection of components mentioned.
A low Compression on a Cylinder would indicate a misfire as well. Suggest have a qualified mechanic perform an Engine Compression test of your Engine. Failure of Electrical components such as a Camshaft and Crankshaft sensors would also indicate a misfire. Fuel Injector problem will also cause a misfire problem. Best to have a qualified mechanic perform a full Diagnostic of Fuel system. Ignition system. Computer control system and Compression test.
Looking at Trouble code chart for your vehicle does not display trouble code 18. It shows trouble code 17. Next trouble after 17 is 25. Please have a qualified mechanic perform a diagnostic of your Onboard Computer System and give you proper trouble code.
As with any intermittent problem, Basics need to be covered. An inspection of your Onboard Computer system with the aid of an Automotive Scanner will be needed. Inspection of your Fuel system using Special tools is Required. Inspection of your Ignition system will also be required. It would be best to have a qualified Mechanic perform a Diagnostic of all three items.
There are many possibilities that would cause a vehicle to hesitate. It would be best to have a qualified mechanic perform a diagnostic of your vehicles on board computer system, fuel system and Ignition system. The Aid of Special tools will be required to perform such test.