Question about Chevrolet Suburban 1500

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Where is the ac drain line located on a 1995 Chevy suburban?My AC works until it freezes up about 13 minutes after I turn it on and the AC does not drain out anywhere under (or in :) ) the truck. I can only attribute this to a blocked drain.

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You could have too much freon,and did you change the orfice tube,inside the line?It could be clogged.And if the drain is blocked,you never know! it can be found under the truck at the bottom of the firewall on the right side.

Posted on Jul 28, 2009

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It should be under the ac condencer on the pasenger side, small plastic tube, might have to get under truck to find it, run a small wire up it to clean it out, most likely cloged up with sediment.

Posted on Jul 28, 2009

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If it actually is freezing up,the low pressure switch is the likely cause.It is screwed into the large ac line near the firewall,witch is the cold line.If it is not there it is in the dryer,near the firewall,or under the air filter box.Follow the ac line(large ac line/hoses)from the ac compressor untill you come to the switch,that is the easy way to locate it.This low pressure switch causes the ac compressor to cycle on and odd according to the pressure sensed from the ac low side line.When it gets really cold the pressure is lowered,and there for it will cut off,and when the pressure rises,it cuts the ac compressor back on.It would be a really good idea to check the freon in the vehicle first.If the ac system is low on freon,it will freeze up on some vehicles.

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You find the AC low pressure at the top of the compressor, orientated toward you , facing the front of the vehicle. You can also follow the compressor line to reach the port.

The valve is covered a plastic cap covering it.
Near the compressor you find two ports, the high port and low port.

To find out which one is the low port, run the air conditioner for a couple of minutes withthe engine on.
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Regards.

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Remove two trim panels from just inside back window and just inside rear side door passenger side. They run down from the head liner. Remove seat belt bolt ( TORX HEAD ) also. Remove lower half of trim from just inside rear side door. You should see screws holding weel cover in place. The top under glass just lifts up slightly to remove entire cover. Just a few more screws and you can hinge the top cover of the duct and fan. You will now see the top half of the rear condenser and if you look down beside it you will see the expansion valve. This about as close as you will get to changing the valve though because the freon lines running to the condenser will be stuck so solidly you would have to destroy the lines on either side of the nut to seperate them. You cannot reach the valve without lifting the condenser from its tray and you cannot lift the condenser without removing the lines from it!!! Good luck!!!

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