One of our readers sent in this problem:

“My AC was working fine till summer started. I didn't use it throughout winter and I was also away for a few months. I came back in April and when I used the AC, it wouldn't blow cold air anymore. While I was away, the car was regularly started every now and then. Why would the AC just suddenly go bad if not used?” – Arif Mahmood, Car: 2004 Toyota Corolla X.

Brace yourself, winter is coming. Many car folk have found out to their dismay that a car AC that was working fine in winter refuses to blow cool air when summer is back.
Here's a surprise fact: Car air conditioners often break down over the winter due to lack of use. Sounds counterintuitive but it's not. When put into use, the AC circulates refrigerant and oil through the system which in turn keeps rubber seals and hoses soft and plaint. Without circulating, rubber seals break down and leaks could form.
Prevention: It's quite simple. Run your AC periodically in winter. Heck, it sure beats the cold outside considering most of our cars have disconnected heater hoses. The AC should keep the interior less cold than outside. The AC also dehumidifies and prevents the windows fogging up when there's more than one person in the car.
Note: This is an issue for older cars that have had rubber parts for more than 5-10 years. If you have queries, mail us at shift@thedailystar.net