When I run water down the sink drain (dishwasher is not on), it trickles into the dishwasher through the side vent. I raised the drain hose and the water coming through the vent increased. I pulled the dw drain hose off the sink drain and water came out as if it were under pressure but it did not drain the dishwasher. Any idea what is causing this problem ?
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Sounds like water is siphoning back into the dishwasher.
Check that there's a high loop in the dishwasher's drain hose between where it comes out of the dishwasher and then loops up past the spigot in the drainpipe, (which should be above the P-Trap or S bend in the drainpipe) almost to under the sink cabinet top and then back down to connect to the drainpipe spigot.
If there's a garbage disposal unit in the drainpipe the dishwasher drain hose should connect to a spigot above the garbage disposal.
Here's an image from the user manual that shows the connections.
They show one where an air gap may be used but it depends on local requirements, but the loop in the drainpipe should go as high as what is shown in Fig.9 just not connecting to the air gap or above the sink top. This is to prevent siphoning from occurring
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