Car AC Regas Near Oxhey, WD19 — From £49 | Watford MOT Centre Oxhey and South Watford drivers can get their car air conditioning recharged at Watford MOT Centre in under 10 minutes. Same day AC regas from £49 — no appointment needed, all makes and models covered. Why Is My Car AC Not Cold? The most common reason is low refrigerant gas. Air conditioning systems are not sealed perfectly — gas escapes gradually over time. An AC regas restores the refrigerant to the correct level