Q & A #16 With The Auto Specialist
Q & A #16 With The Auto Specialist
Welcome back. In the last installment of the Auto Specialist, we looked at an overheating problem that a reader was experiencing. We also discussed an issue that one driver was having with a failing alternator. Today, we’re going to explore two new car problems: one with an air conditioning unit and another that is causing a misfire. These two issues occur frequently, so both are good additions to this column. Let’s jump right in.
Question: I own a 2004 Infiniti FX35 that I purchased when it was new. It has 97,500 miles on it (I’m on the road a lot for work). The problem I’m having is that my A/C is putting out warm air when I’m driving. I’ve tried to put freon in, but that didn’t change anything. I’ve also made sure that the compressor comes on. This is the first time I’ve ever had a problem with my car. I’m in Arizona, so I need the A/C (especially because I drive so much). Do you have any idea what is causing the warm air to come out?
Answer: It sounds like your compressor isn’t working properly. Even though it comes on when you’re running your A/C, it’s possible that it is not pressurizing the freon. If the freon isn’t pressurized, it won’t produce cool air. I would take your vehicle to a mechanic to have him test the compressor. If that is truly the issue, and he’s unable to fix it, you’ll need to have it replaced.
Question: I drive a 2003 Volkswagen Golf and have never had any complaints. It’s a great little car. The mileage is about 83,000, so last week I changed out the spark plugs. My car has been misfiring ever since. The plugs are brand new, so I shouldn’t be getting a misfire, right? I thought that only happened with bad plugs. Can you tell me what’s causing the problem?
Answer: I think I know what might have happened. When you put the new spark plugs in, you might have tightened one or more of them too tightly. Each plug has a porcelain insulator which supports the electrode. If you tightened one of them too far, you can accidentally crack it. Take each plug out and look at the insulator for cracks.
By the way, if this turns out to be the issue, don’t feel badly. I’ve seen experienced mechanics crack insulators accidentally while tuning up older cars. They’re more fragile than they look.
In the next installment of the Auto Specialist, we’ll look at a new batch of car issues. I’ve been receiving emails from owners asking questions about a variety of parts. As I’ve mentioned in the past, the more you know about your vehicle and the components that make it run smoothly, the better. Eventually, you’ll start doing minor repair jobs at home, saving you a trip to your mechanic. Until next time, drive safely.
