A beer or soda box (cans) is pretty pliable. Roll it around your finger and stick it down there to sleeve the tee so it blocks the hole going back to air handler. Then blow air through the "sleeve"

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Is it possible to have this set up:

Primary drain: Drains to the outside through the attic
Secondary drain: Drips into drain pan and drain pan also drains to the outside through the attic

1968 home single story home. Don't seen anything connecting into any of my sinks.

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My previous home (built in 2005) had this setup. It was built in a rural area outside of any municipal building jurisdictions. Lots of weird quirks that probably wouldn't pass code if built within the nearby city limits.

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I am going to try and post a picture but it appears if I blow air into the pvc it is going to view water back into the air handler. I put a little bleach into the pipe and I do not see the secondary pipe leading anymore.

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That's why you disconnect the drain pipe and blow towards the drain. You don't need an air compressor, just blow on it.

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Is the drain pan being dry normal? I would have thought it would have been wet.

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If you're talking about the emergency drain pan that is underneath the unit yes it should be dry. It is only there to catch the condensation if your other drains have failed.

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Primary drain: Drains to the outside through the attic
Secondary drain: Drips into drain pan and drain pan also drains to the outside through the attic

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Yes your house is old so it might all go outside. You'll have to look in the attic and trace the lines to be sure where they go. It might also connect to the sewer system someplace other than the sink.

To clarify:
His is draining from a second story. If yours look likes this then your AC gu did it wrong and it would open your home up to al kinds of rust and water infiltration problems. Now a pipe running out neer the ground would be old school but not to wierd.

"When the government fears the people, you have liberty; when the people fear the government, you have tyranny." Thomas Jefferson
"The only thing necessary for the triumph of evil is for good men to do nothing."
Edmund Burke

A/C unit is a dehumidifier, that water has to go somewhere. That is the primary drain line.

It is possible for the primary coil to go wobbly, and form condensation on the outside of the unit. Or, for the coil unit to rust out, and then leak. Since both of those have bad outcomes, a drip pan is provided under the coil to mitigate those outcomes.

So, there are two drain lines.

In cities with permit/inspection departments, that primary drain can be led to the sanitary sewer system--the house's drain line. In days of old, this was "wet stacked" by cutting into the nearest stack vent through the roof. Modern practice is to being the drain in to the conditioned envelope of he house, and below a wet trap--hence connections under the sink.

Out side of city regulation (not necessarily city limits) those drains sometimes are just lead to a wall or soffit and "daylighted."

Now, one of the reasons to drain the primary drain within the conditioned envelope of the house is to keep war/hot outside air from trickling back up the drain line into the coil.

Good (recommended/mandated) practice on the secondary drain is to have it drip right in front of a window, so that it can be seen. This is because that drain running will largely be due to a bad condition with the coil or the primary coil.

Bleach and a foot pump did the trick.the secondary pipe isn't making outside anymore. Thanks for the help guys.