So this is going to sound like an oddball question.
Last September, I started a job where I’m in my '98 Civic Hatchback most of the day. I was coming home with crazy headaches. I then had my cracked manifold replaced. Basically, pretty much the whole exhaust system has been replaced within the past couple years. I thought it was the exhaust fix that fixed my headaches. In late 2013 when it started getting cooler, I stopped using the AC around the same time the manifold was replaced. Either way, around this time, headaches stopped.
Role into Spring 2014. The past week I’ve been using the AC a lot because of the heat. The headaches have been coming back. Today I noticed a headache coming on pretty strong. It’s the same type of headache I was getting last year when I was using the AC. I rolled down the windows and turned off the AC. I noticed the headache subside after and hour and a half or so.
Question: is it possible to get headaches from my AC system? If so, what do I need to do? It’s getting hotter in St. Louis and my job requires that I’m in the car 5 days a week most of the day.
I used the heat most of our very cold winter. No headaches from that. Sometimes when I turn the AC on I can smell a faint “stale cocoa powder” smell. I realize this sounds crazy but would appreciate any help.