Road dust coming into cab

[Rubble]

My 81 crew is getting a lot of dust coming into the cab on gravel roads.This thing has a/c but nothing works anymore,no compressor & some lines are disconnected.This is the first a/c equipped square I've had so not real familiar with the system.Any other of my squares:'86,'87,and 2 '80s non air don't have this problem.I can run down a gravel road with drivers window down and little or no dust,but not with this crew.The heater/ac control is in off position also.I've had squares for 30 years and this is the only one I have had that much dust come in,the others can even run with rear slider open too.TIA
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[Rubble]

Any ideas?????????
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[frog210]

check to make sure the housing of the ac in the engine bay is nice and tight
on the passenger side kick panel, theirs a flap(dont know the name sorry) the ones with the blower, maybe theirs a hole in your cowl area, that allows air to come in to the cab,
weatherstripping
just tossing out ideas

[Rubble]

Ok,will try that.This truck has sat over last winter & mice moved into heater/AC housing so it's gonna come out here soon anyway.I have a few parts trucks non a/c so this crew is gonna get a swap to heater only to get the critters and smell out for good!! Up here the heater is needed more than the ac anyways.
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[frog210]

Down here ac is needed more the heater lol
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[motornut]

Originally Posted by Rubble

My 81 crew is getting a lot of dust coming into the cab on gravel roads.This thing has a/c but nothing works anymore,no compressor & some lines are disconnected.This is the first a/c equipped square I've had so not real familiar with the system.Any other of my squares:'86,'87,and 2 '80s non air don't have this problem.I can run down a gravel road with drivers window down and little or no dust,but not with this crew.The heater/ac control is in off position also.I've had squares for 30 years and this is the only one I have had that much dust come in,the others can even run with rear slider open too.TIA
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does the fan motor actually turn off?
i cut the low speed wire so i have an off
without the AC on the outside air is coming in
see if you can find a non- AC vent for the pass side foot area

[Rubble]

I tried unplugging cab fan,still dust coming in.Shoved a rag in the passenger side vent & this helped a bit.Gonna try I with a non ac vent.
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