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" Q: I severed the air conditioning line on my 2000 Chevy Silverado 5.3. All the refrigerant and some bright green liquid escaped. Can I refill it with refrigerant cans that contain oil, or do I need to add more oil? A: No can do. The system will have to be evacuated properly, to remove any oil and any water or humidity that got in. Then you can add the correct amount of oil and refrigerant, in this case R134a. Modern a/c systems don&amp;#039;t use very much refrigerant, and they&amp;#039;re pretty intolerant of being overcharged. Same for the special lubricating oil. And even the smallest amount of moisture in the system will freeze up and cause major problems. That&amp;#039;s why you have to run a vacuum pump on system that&amp;#039;s been open. Q: When changing oil on my old Benzes 1974 thru 1985, 3 are diesel, 4 are gas, is it all right to mix synthetic and multiviscosity oils? I use Valvoline products.  A: Yeah, it&amp;#039;s okay to mix, although you dilute some of the reasons for using synthetics if you do. Just be sure to use diesel-rated oil in the diesels and gasoline rated oil in the gassers. Q: I just put new brakes on my 1999 Cadillac Deville. Now abs/traction control light is on. How do I reset it?  A: It&amp;#039;ll reset itself if the problem is fixed, after a few key-on/key-off cycles. Or you could remove the ABS fuse for ten seconds. Or just disconnect the battery cables for tens seconds if you&amp;#039;re too lazy to look in the owner&amp;#039;s manual and find out which is the ABS fuse. This will also reset the engine ECM and erase all your radio station presets and clock. Q: My old 1990 Chrysler La Barron V6 FI with 351,000 miles has a spark plug stripped on the front bank. I was able to pull out all other plugs without a problem, and the engine works fine. Do you have any ideas on how to remove the stripped plug from aluminum head? A: Exactly what is the problem? &amp;quot;Stripped&amp;quot; means the plug is out and has damaged the threads in the cylinder head. There are threaded inserts to repair damaged threads. If the old plug is still in the head, and the engine is running\u2014then it&amp;#039;s not stripped. Do you mean it has frozen to the head and won&amp;#039;t come out? Just turn harder. Work when the engine is cold. Or do you mean that the plug&amp;#039;s corners rounded off so you can&amp;#039;t turn it? You may need to replace the head, or at least remove it and have a machine shop remove the plug for you.  Q: I have a 1999 Grand Cherokee Laredo Jeep that I have replaced the wipers on at least 5 times. I have even taken back wiper blades that were only months old and replaced them. The problem is that the wipers make a terrible squeaking noise and they shake as they go across the windshield. I have tried silicone wipers and I have tried putting rain-x and nothing seems to work. Do you have any suggestions?  A: You&amp;#039;re in luck. I wrote a column on How To Keep Your Windshield Clean. This should answer your questions.  "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/cars/how-to/a2913/4321649/>