Auto Service Professional

FEB 2018

Magazine for the auto service professional

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8 | ASP February 2018 Technical Tech tips From Volkswagen Jetta problems to knee pads JETTA COLD START If you run into a 2001 VW Jetta 2.0L that is difficult to start when cold, but seems to run fine when warmed, the issue may be a faulty coolant temperature sensor. During a recent diagnosis, the only code that popped up was P0422, which indicated a catalytic converter related issue. After verifying the converter as OK and after suspecting and replacing the ignition coil and fuel filter and cleaning the throttle body, the problem remained. e issue was finally resolved by simply replacing the coolant temperature sensor. e engine fired up easily when cold or warm and ran without further issues. SPEAKING OF JETTAS A fairly common problem with 2000-era VW Jetta models deals with a driver com- plaint of very little heat coming from the heater box ducts. e factory used some type of low grade foam to cover a series of holes in the flapper doors inside the heater box, which dried out and crumbled over time (the vehicle owner may mention that they've seem dust and small crumbs being blown out of the vents over time). Once the foam is gone, the flapper doors are open and can't direct heat to the vents properly. e fix involves a bit of work to gain access to the lower portion of the box, but doesn't require removal of the entire dash. Once you have access, you can fabricate and install fiberglass or Delrin or even metal plates to screw onto the doors. It's a bit of a pain, but it's do-able. Just don't automatically assume that you're dealing with a bad heater core when someone complains about no interior heat. RUSTY FORD TRACKS Apparently, Ford didn't coat the front seat tracks on the 2009-2012 Escape models very well, since they tend to rust more than "normal." It's worth inspecting a customer's Escape when it's in the shop for other service. If the tracks look rusty, it's a good idea to address the issue now before it gets worse. Remove the affected seat track from the seat base. Clean the track assembly with wax and grease remover (Prep-Sol, etc.) and allow it to dry. Remove all traces of grease now, which will make it easier to remove rust. Mask off the power motor and harness to protect them from sanding grit. Attempt to remove rust using 220-grit sandpaper and a wire brush. You can speed this up by using a die-grinder equipped with a Scotchbrite pad for areas that are accessible. Blow the tracks with shop air to remove loose rust and residue. Remove the masking tape. Clean the entire track to prep for paint. You can do this with a brake cleaning solvent. Don't dunk the assembly into a parts washer, unless you want to kill the power motor. After cleaning, make sure it's clean and dry. Be sure to mask off the power seat motor and har- ness before sanding. After the assembly is clean and dry, remove the masking tape and re-mask the motor and harness. Do not use blast media.

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