roof "caves in" when going through a car wash?

p8ntballa9362 said:

sorry if this is the wrong spot, not sure where to put something like this.

had my 14 ram for a year or 2, and have generally loved it. that said ever since ive had it ill take it through a car wash( i know i know) and get it washed. the problem arises at the end when it blows all the water off, once you really get into the strongest part of it, the roof gives me an audible thump and i can even see the headliner move slightly. it does it every time but i never hear or see it return back up when im clear. theres no leaks as far as i can tell, i havent inspect the top center of the windshield seal lately but theres really no issues other than it being really weird. i should note the dealership replaced my windshield when i first bought it.

does this happen to anyone elses 4th gen truck, or am i alone here?

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Jim Carelas said:

Don't notice it on my 2019 1500 Crew Cab.

GOOD INFO for all Ram Trucks. I put my truck, several months back, through a wash with the power wash for the bottom to wash off any salt. I did this a few times but couldn't get it to wash past my front seat. THEN one day I was able to have it power wash the underside past my rear seats. THEN the next time I tried to pump gas I couldn't pump more than 2 gallons before it would click off. As if it was full. I could then only pump about half a gallon then another click.

I took it to my Dealer and they then tried several "fixes" MOPAR told them to do. Nothing worked until they finally replaced my gas tank. My research told me the gas tank has a "Rollover Valve" that causes the problem. The only way to fix my problem is to do the replacement.!!

I mention this to warn all to NEVER allow a high pressure spray to hit the exposed gas tank behind the rear seat. If you look at that area the gas tank is exposed to everything from below. I believe the spray caused the valve to go out of whack causing it to no longer work properly. So remember to never use the high pressure spray under the truck.!!

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Wild one said:

I take my floorjack with me to the carwash and jack the truck up and wash the living hell out of everything underneath (usually a 1/2 dozen or more times per year),including the tank,and especially where the straps attach to the frame,been doing it for years,and never had an issue. i also don't park it,if i run into a heavy rainstorm,so i doubt the under carriage wash was the culprit. My 14 looks like this underneath,as i'm anall about washing it underneath,lol

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Jim Carelas said:

My guess is your hose washing is no where near the pressure a car wash would give your vehicle. It's great you do what you do for the underneath. I made the comment about the Rollover Valve for anyones information.

Given that my 2019 was only a year old when the problem happened I can only believe the High Pressure was the problem. Given it happened the next time I filled up a few days later.....

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