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;.
Water leaks in central air conditioners are almost always caused by a problem with the condensate pan or drain pipes. The most common of those problems is a clogged drain line. When your condensate drain line gets clogged, water backs up and builds up in your pan. With nowhere to go, that water will begin to leak over your drain pan and onto your system and your floor. Another problem that can lead to a water leak is a crack somewhere in the pan or in the drain pipes.
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.