joh510 Posted May 26, 2011 Share Posted May 26, 2011 (edited) Have a older RD model dump mack and noticed every time it rains I get water on the floor under the dash mostly on the passenger side, where is this coming from?the vent in the front center is closed.. anyone? driving me crazy! Edited May 26, 2011 by joh510 Quote Link to comment Share on other sites More sharing options...
terry Posted May 27, 2011 Share Posted May 27, 2011 Check the gasket around the vent in the roof. They will leak with age. terry Quote Link to comment Share on other sites More sharing options...
Doug Maney Posted May 27, 2011 Share Posted May 27, 2011 Could also be the cab marker lights. Quote Interested in Old Trucks? Check out: www.antiquetruckclubofamerica.org Link to comment Share on other sites More sharing options...
storkmack Posted May 27, 2011 Share Posted May 27, 2011 I also have this problem, in my 94' RD. After a bath or good rain i have water on the floor under the dash on the passenger side. Have not been able to find the problem in the 7 years I have owned it. Quote Link to comment Share on other sites More sharing options...
bobo Posted May 27, 2011 Share Posted May 27, 2011 cab lights, roof vent and the silicon between the hood vent and the fire wall(water runs through the air duct and out the blower motor) bobo Quote Link to comment Share on other sites More sharing options...
rw613 Posted May 27, 2011 Share Posted May 27, 2011 cab lights, roof vent and the silicon between the hood vent and the fire wall(water runs through the air duct and out the blower motor) bobogasket behind wiper arm Quote Link to comment Share on other sites More sharing options...
maxidyne237 Posted May 27, 2011 Share Posted May 27, 2011 also dont forget around windshield washer fitting. Quote Link to comment Share on other sites More sharing options...
stev Posted May 27, 2011 Share Posted May 27, 2011 I have seen this kind of thing caused by leaks in the door. I found that the squeegee gasket on one door was letting water in. Check the underside of the door to see if it is also wet . . . . Quote Link to comment Share on other sites More sharing options...
Lmackattack Posted May 27, 2011 Share Posted May 27, 2011 My 77' was letting water in from the cowl where the top drivers side corner of the hood had rubbed through some body sealant. It was in that little aera where the side and top of the hood meet the cab. There is a gap in the sheet metal and then sealant was used to smooth it out. This gap channeled rain to any spots with bad sealant and water could make it in and drip on the floor mat.I found this by chanc one rainy day. I Also found that rust near the rain gutter will let rain get under the skin and will leak down meet the floor vent Quote Link to comment Share on other sites More sharing options...
Mike Posted May 27, 2011 Share Posted May 27, 2011 Have a older RD model dump mack and noticed every time it rains I get water on the floor under the dash mostly on the passenger side, where is this coming from?the vent in the front center is closed.. anyone? driving me crazy! The best way to check it is, get someone to waterhose it down in the area and watch it under the dash. Sometimes we get lucky this way. mike Quote Link to comment Share on other sites More sharing options...
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