tracking down cab water leaks - The 1947 - Present Chevrolet & GMC Truck Message Board Network

project72lwb · 05-12-2002, 07:19 PM

Am in the process of having front,rear weatherstrip redone again. In eliminating soures of water seepage how do I distinguish between water entering from the weatherstrip or trickling through the body from the drip rails. What areas need to be filled with seamsealer to keep interior of truck warm and dry?

1-PU70 · 05-12-2002, 07:29 PM

There are 2 seams under the cowel. One is where your left foot would be and there is one on the pas side same place and the seam all the way across between the two. Check them.

project72lwb · 05-12-2002, 07:37 PM

would the same seam sealer be appropriate here also and what is the best way to work the sealer itself?

tom hand · 05-12-2002, 07:39 PM

I have had several of these trucks and every time I have had a leak in the cab it was the drip rails. Just a small crack in the cauking can let in a lot of water. My 71 would pour inside and it looked like it was coming from the windshield weaterstrip but it was the drip rails. My 72 i have now, I resealed the drip rail when I painted it and I have all aftermarket weaterstripping installed with only soapy water to lube it. No sealer at all. And no leaks. Unless you have rust on the part of the cab that the weatherstrip seals on, sealer should not be needed. Inspect the driprails and suspect the smallest crack. GOOD LUCK

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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS

project72lwb · 05-12-2002, 07:41 PM

thanks...

Sammy · 05-12-2002, 08:44 PM

Just an idea..Get inside the cab and have some one with a water hose on a trickle go over the entire area a small section at a time to look for possible leaky spots...

Stano · 05-12-2002, 10:52 PM

You could get a spray bottle with soapy water in it and turn on the heater blower on high and spray in small areas this will find small leaks that plain water might not show. Make sure the doors and windows are shut. Might even tape up obvious rust holes such as cab corners etc. If so applicable.

------------------
Current Project(s)
67 Chevy LWB (almost a truck again)
68 Suburban (Basket case ,got basket and its gettin fuller)
DAILY DRIVERS
71 C-20 Built 327,4spd,4.11 Posi
84 K5 Blazer(Sorry this ride is closed for repairs)
HiPerf cat., Flowmaster
94 GMC Conversion van
(Wifes ride)
Kickin back in Rolla,Mo. USA

"Do the thing you fear most and the death of fear is certain" unknown

Stano · 05-12-2002, 10:52 PM

You could get a spray bottle with soapy water in it and turn on the heater blower on high and spray in small areas this will find small leaks that plain water might not show. Make sure the doors and windows are shut. Might even tape up obvious rust holes such as cab corners etc. If so applicable.

------------------
Current Project(s)
67 Chevy LWB (almost a truck again)
68 Suburban (Basket case ,got basket and its gettin fuller)
DAILY DRIVERS
71 C-20 Built 327,4spd,4.11 Posi
84 K5 Blazer(Sorry this ride is closed for repairs)
HiPerf cat., Flowmaster
94 GMC Conversion van
(Wifes ride)
Kickin back in Rolla,Mo. USA

"Do the thing you fear most and the death of fear is certain" unknown

Stano · 05-12-2002, 10:53 PM

You could get a spray bottle with soapy water in it and turn on the heater blower on high and spray in small areas this will find small leaks that plain water might not show. Make sure the doors and windows are shut. Might even tape up obvious rust holes such as cab corners etc. If so applicable.

------------------
Current Project(s)
67 Chevy LWB (almost a truck again)
68 Suburban (Basket case ,got basket and its gettin fuller)
DAILY DRIVERS
71 C-20 Built 327,4spd,4.11 Posi
84 K5 Blazer(Sorry this ride is closed for repairs)
HiPerf cat., Flowmaster
94 GMC Conversion van
(Wifes ride)
Kickin back in Rolla,Mo. USA

"Do the thing you fear most and the death of fear is certain" unknown

05-12-2002, 07:19 PM	#1
project72lwb Registered User Join Date: May 2002 Location: owasso, ok Posts: 30	tracking down cab water leaks Am in the process of having front,rear weatherstrip redone again. In eliminating soures of water seepage how do I distinguish between water entering from the weatherstrip or trickling through the body from the drip rails. What areas need to be filled with seamsealer to keep interior of truck warm and dry? __________________ 68 chevelle(garage queen) 72 cheyenne super(driver) Owasso, Oklahoma

05-12-2002, 07:29 PM	#2
1-PU70 Registered User Join Date: Apr 2000 Location: Bradenton, FL Posts: 1,036	There are 2 seams under the cowel. One is where your left foot would be and there is one on the pas side same place and the seam all the way across between the two. Check them. __________________ 1970 CST/10 402,700R4,3:73 posi,AC,PS,PB,TLT,PW,Buckets with heaters

05-12-2002, 07:37 PM	#3
project72lwb Registered User Join Date: May 2002 Location: owasso, ok Posts: 30	would the same seam sealer be appropriate here also and what is the best way to work the sealer itself? __________________ 68 chevelle(garage queen) 72 cheyenne super(driver) Owasso, Oklahoma

05-12-2002, 07:39 PM	#4
tom hand CCRider Join Date: Feb 2000 Location: Olive Branch,MS,USA Posts: 2,232	I have had several of these trucks and every time I have had a leak in the cab it was the drip rails. Just a small crack in the cauking can let in a lot of water. My 71 would pour inside and it looked like it was coming from the windshield weaterstrip but it was the drip rails. My 72 i have now, I resealed the drip rail when I painted it and I have all aftermarket weaterstripping installed with only soapy water to lube it. No sealer at all. And no leaks. Unless you have rust on the part of the cab that the weatherstrip seals on, sealer should not be needed. Inspect the driprails and suspect the smallest crack. GOOD LUCK ------------------ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS __________________ 72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS

05-12-2002, 07:41 PM	#5
project72lwb Registered User Join Date: May 2002 Location: owasso, ok Posts: 30	thanks... __________________ 68 chevelle(garage queen) 72 cheyenne super(driver) Owasso, Oklahoma

05-12-2002, 08:44 PM	#6
Sammy Registered User Join Date: Apr 2000 Location: Bonne Terre, Mo Posts: 3,005	Just an idea..Get inside the cab and have some one with a water hose on a trickle go over the entire area a small section at a time to look for possible leaky spots... __________________ '69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629"

05-12-2002, 10:52 PM	#7
Stano Registered User Join Date: Jul 2000 Location: Mo Posts: 963	You could get a spray bottle with soapy water in it and turn on the heater blower on high and spray in small areas this will find small leaks that plain water might not show. Make sure the doors and windows are shut. Might even tape up obvious rust holes such as cab corners etc. If so applicable. ------------------ Current Project(s) 67 Chevy LWB (almost a truck again) 68 Suburban (Basket case ,got basket and its gettin fuller) DAILY DRIVERS 71 C-20 Built 327,4spd,4.11 Posi 84 K5 Blazer(Sorry this ride is closed for repairs) HiPerf cat., Flowmaster 94 GMC Conversion van (Wifes ride) Kickin back in Rolla,Mo. USA "Do the thing you fear most and the death of fear is certain" unknown __________________ New daily driver 96 Chevy K3500 crew cab dually 53,000 miles 350 Vortec 4L80 Nice ride 67 Chevy C-10 LWB Built 350 TH-400 Wifes ride and family rig: 2001 Furd Expedition 5.4 Liter Kickin back in Rolla,Mo. USA "Do the thing you fear most and the death of fear is certain" Mark Twain

05-12-2002, 10:53 PM	#9
Stano Registered User Join Date: Jul 2000 Location: Mo Posts: 963	You could get a spray bottle with soapy water in it and turn on the heater blower on high and spray in small areas this will find small leaks that plain water might not show. Make sure the doors and windows are shut. Might even tape up obvious rust holes such as cab corners etc. If so applicable. ------------------ Current Project(s) 67 Chevy LWB (almost a truck again) 68 Suburban (Basket case ,got basket and its gettin fuller) DAILY DRIVERS 71 C-20 Built 327,4spd,4.11 Posi 84 K5 Blazer(Sorry this ride is closed for repairs) HiPerf cat., Flowmaster 94 GMC Conversion van (Wifes ride) Kickin back in Rolla,Mo. USA "Do the thing you fear most and the death of fear is certain" unknown __________________ New daily driver 96 Chevy K3500 crew cab dually 53,000 miles 350 Vortec 4L80 Nice ride 67 Chevy C-10 LWB Built 350 TH-400 Wifes ride and family rig: 2001 Furd Expedition 5.4 Liter Kickin back in Rolla,Mo. USA "Do the thing you fear most and the death of fear is certain" Mark Twain



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