Antihistamines, H1. Histamine antagonists or antihistamines are drugs that relieve allergy symptoms.Histamine is a chemical used to identify and remove substances that trigger an allergic response. Ã¢ There are four histamine receptors &#40;designated H<sub>1</sub>, H<sub>2</sub>, H<sub>3</sub>, H<sub>4</sub>&#41;.
Quick Answer. Blocked condensation drain lines often cause excessive amounts of water in an air conditioner drain pan. These lines are designed to funnel excess water from condensation away from the air conditioning system inside the home. If these lines become blocked, the excess water drains into a drain pan.
If you need to unfreeze an air conditioner unit, it is not as simple as just removing ice from the air conditioner system. In addition to thawing the unit and collecting the water as it melts, it is also important to determine the cause of the freezing.s the air conditioner thaws, water will drip and leak from the unit itself. So that the thawing water does not create a mess, fix a trash bag or bucket underneath the air conditioner unit. Monitor this carefully over the next couple of hours as the ice melts.