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Heating & Cooling 2nd Gen Dodge Ram Heating & Cooling Problems and Questions.


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  #1  
Old 05-03-2014, 06:12 AM
pabrtank pabrtank is offline
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Default Coolant leak

Hi, I am new to both the forums and Ram ownership. It took me 20 years but I finally got one. It is a 1500 st(plain jane) Reg. cab/short bed with the 3.9L V6 with the 4 speed auto. transmission.
My problem is a coolant leak, but I can't find it. It doesn't leak when it is just sitting, but when it is running it sprays coolant in a flat fan shape inline with the belts. I know that the belt is what is spraying the coolant but what I can't figure out is if it dripping from the water pump onto the belt or from one of the hoses onto the belts. The pattern is of no help because it is a consistent spray 360deg. around the belts. Has anyone had this occur? Any help or advice would be appreciated.
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Old 05-03-2014, 11:50 PM
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RogerRamJet RogerRamJet is offline
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Quote:
Originally Posted by pabrtank View Post
Hi, I am new to both the forums and Ram ownership. It took me 20 years but I finally got one. It is a 1500 st(plain jane) Reg. cab/short bed with the 3.9L V6 with the 4 speed auto. transmission.
My problem is a coolant leak, but I can't find it. It doesn't leak when it is just sitting, but when it is running it sprays coolant in a flat fan shape inline with the belts. I know that the belt is what is spraying the coolant but what I can't figure out is if it dripping from the water pump onto the belt or from one of the hoses onto the belts. The pattern is of no help because it is a consistent spray 360deg. around the belts. Has anyone had this occur? Any help or advice would be appreciated.
Go to your local parts store and rent a cooling system pressure tester. They'll get you the correct one for your truck.

Put your cooling system under pressure, while the truck is cool and not running, and then you should be able to find the leak.
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Old 05-06-2014, 10:41 PM
Lazarus Truck Lazarus Truck is offline
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X2 with Roger. Sometimes this is the "timing-cover-to-block" gasket. Very hard to see. Might wanna hit that area at the quarter-car-wash first to get a good look at it.
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Old 05-16-2014, 02:01 AM
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slimpartywagon slimpartywagon is offline
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Originally Posted by Lazarus Truck View Post
X2 with Roger. Sometimes this is the "timing-cover-to-block" gasket. Very hard to see. Might wanna hit that area at the quarter-car-wash first to get a good look at it.
Just finished doing the same thing to my truck... my truck over heated on me, upon inspection i found the Radiator Core had separated from the tanks, so dropped in a new radiator. Stared the engine up to see water spraying out from what looked like the water pump, so I replaced the water pump, but while I was in that deep I noticed that water had been leaking behind the timing cover, so I pulled the timing cover and put in a new timing chain while I was in there. Also I replaced all my hoses, belt, pullies, and thermostat, that way nothing up front would fail for quite some time.
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Old 05-16-2014, 02:10 AM
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Water pumps have a round hole under the shaft
it starts leaking when the water pump seal is going bad

you may want to disconnect your battery before sticking your hand under the pump
fan blades & bents can mess up your day
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Old 05-16-2014, 10:04 PM
Lazarus Truck Lazarus Truck is offline
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Just did the same job Slim. The water passages on my timing-cover were very eroded. I had to build them up with JB weld, and sand them with 400grit till flat to make a good seal.
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Old 06-01-2014, 01:45 AM
Twistedwrench78 Twistedwrench78 is offline
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Hey Lazarus,

I am curious why you rebuild the cover with JB weld? Is it an expensive piece to replace? Does the JB weld fix actually work well? I'm asking because I have a leak on my timing chain cover and will be doing this repair in the next few weeks on my truck.
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Old 06-01-2014, 09:42 AM
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Hey Twisted, JB weld is amazing stuff. I had a cracked water pump housing on a sprinkler pump putting out 40 psi. I cleaned the crack and used JB weld and that fixed it.
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Old 06-03-2014, 11:50 PM
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Regular JB weld is completely sufficient for this repair. The aluminum timing cover is not a high-heat area. The failure was caused by a seepage of coolant that caused a catalytic erosion of the aluminum timing cover. Ideally, you should sand/blast the corroded area. Then build it up with the JB Weld. Knock it down to a smooth 400 grit surface. You could stop there, but I always use my favorite sealant. Permatex Hylomar. Not a bead, just a finger smear with a rubber glove, around the whole gasket. I have never had a failure with this method.
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Old 06-12-2014, 12:27 AM
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slimpartywagon slimpartywagon is offline
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Quote:
Originally Posted by Twistedwrench78 View Post
Hey Lazarus,

I am curious why you rebuild the cover with JB weld? Is it an expensive piece to replace? Does the JB weld fix actually work well? I'm asking because I have a leak on my timing chain cover and will be doing this repair in the next few weeks on my truck.
JB Weld is awesome stuff... I built a thermostat housing completely out of JB Weld. For Lazarus' situation, I would have done the same thing... Its easy to work with, and you are only using it to fix imperfections in the aluminum and machining down the sealing surface area. A new one costs about 175-200 bucks depending upon where you get it (new) and used my junk yard sells them for 75.... a tube of JB Weld is what 8 bucks at most.
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