Why replace evaporator?
Thread Starter
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Joined: Oct 2007
Posts: 81
Likes: 0
From: Arlington TX
Why replace evaporator?
Why does the evaporator "have" to be replaced just because the system is opened? The new one isn't sealed from anything. There is no possible way to install one without exposing it to "atmosphere." HVAC conspiracy to make more money? 
What gives?
What gives?
Race Director
Joined: Sep 2001
Posts: 10,560
Likes: 439
From: Wellington, FL
St. Jude Donor '11 thru '25
The dryer's job is to hold any moisture that may be in the system. It can only hold so much and that is why replacement is recommended when the system is opened. Moisture is the enemy of a/c as it can freeze and block the flow of refrigerant and can also cause corrosion of aluminum parts when combined with refrigerant. 
Melting Slicks
Joined: Mar 2004
Posts: 3,365
Likes: 0
From: Farmers Branch TX
Cruise-In VI Veteran
St. Jude Donor '09
The dryer's job is to hold any moisture that may be in the system. It can only hold so much and that is why replacement is recommended when the system is opened. Moisture is the enemy of a/c as it can freeze and block the flow of refrigerant and can also cause corrosion of aluminum parts when combined with refrigerant.
Drifting
Joined: Mar 2008
Posts: 1,900
Likes: 3
From: Nixa Missouri
The dryer's job is to hold any moisture that may be in the system. It can only hold so much and that is why replacement is recommended when the system is opened. Moisture is the enemy of a/c as it can freeze and block the flow of refrigerant and can also cause corrosion of aluminum parts when combined with refrigerant.
Thanks. Thanks, Not trying to hyjack.
Race Director
Joined: Sep 2001
Posts: 10,560
Likes: 439
From: Wellington, FL
St. Jude Donor '11 thru '25
I'm fairly certain that the '70 came with the sight glass in the dryer. This aids in the charging of the system with freon. Once the sight glass is clear, the general rule is to add 1 more can of refrigerant to the system to complete the charge. It is not necessary to have this glass.
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