An AC system has many components: compressor, condenser, receiver dryer, evaporator, and hoses. The compressor, the âheartâ of the carâs air conditioning system works like a pump taking refrigerant, (R-12 in older cars, R-134a in 1995 and newer cars) and pressurizing it, passing it along to the evaporator. The AC compressor has several moving parts (including pistons and valves).
Quick Answer. According to WebMD, a normal blood pressure is lower than 120/80. This means that the systolic number is 120 or lower, and the diastolic number is 80 or lower. The systolic number measures artery pressure when the heart contracts. The diastolic number measures artery pressure between heartbeats.
Avoid Blood Pressure Spikers. 1  Caffeine â Hold off on the morning cup of coffee before measuring your blood pressure. No caffeine for half an hour before measuring is best. 2  Tobacco â If you can stop altogether, your heart will thank you. Otherwise, avoid for at least half an hour before you take a measurement. Exercise â Great to do, just wait until after you check your blood pressure. Avoid exercise for thirty minutes prior to blood pressure readings. Medication â For an accurate reading, you should have as little medication in your blood as possible. Food â Wait to eat until after you check your blood pressure. Alcohol â Avoid alcohol consumption for at least half an hour before checking your blood pressure.