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Old 05-09-2017, 08:14 PM #1
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Leaking coolant from reservoir after driving more than 15 mins

So I've been leaking coolant on a hot day and driving for a bit. I replaced the tank and filled it back but still leaks. The truck won't overheat or anything but it seems to rev a little louder than normal under 25mph.. I know I need to replace the timing belt and water pump and probably thermostat soon. Any ideas why I'm leaking?
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Old 05-09-2017, 08:38 PM #2
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Replace your rad cap.....if it continues...put a pressure gauge on it. Don't panic it's probably not a head gasket....LOL...just had to say that.
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Old 05-09-2017, 08:51 PM #3
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Quote:
Originally Posted by reelamin View Post
Replace your rad cap.....if it continues...put a pressure gauge on it. Don't panic it's probably not a head gasket....LOL...just had to say that.
I'm so worried it could be a head gasket lol!
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Old 05-09-2017, 11:51 PM #4
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The coolant is being pushed into the resivior?? Hmm...does it get sucked back into the radiator when cool? If no, then it could be a blown headgasket. Another thing...are there bubbles in the resivior when the truck is warm?
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Old 05-10-2017, 11:49 AM #5
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Is it "leaking" out the overflow hose on the reservoir or is the level going down in the reservoir?
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Old 05-10-2017, 12:16 PM #6
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OP, you need to give us more details for us to be able to help you.

Where exactly is it "leaking" from? That would be a good start.
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Old 05-10-2017, 12:59 PM #7
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Quote:
Originally Posted by thegipper View Post
OP, you need to give us more details for us to be able to help you.

Where exactly is it "leaking" from? That would be a good start.
Pretty sure I said its leaking from the tank. It'll spew out of the cap. It'll drain out almost all of my coolant and It will be close to empty when it's done leaking.
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Old 05-10-2017, 01:05 PM #8
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Does the temp gauge ever move above the center mark? A scangauge, ultra gauge or similar OBD reader can also tell you actual water temps at the outlet of the motor - it might help the diagnosis.

I'd start with the easy one, like reelamin said - radiator cap, OEM only! If the system can't hold pressure, it will boil near the cylinders and push coolant out the radiator cap, fill the overflow and come out the vent on the overflow.

You can also test for exhaust gasses in the coolant, but that is less likely.

If the other stuff is due (radiator, hoses, thermostat with jiggle valve at 6 o'clock, water pump, etc.) then do that next.

-Charlie
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Old 05-10-2017, 01:06 PM #9
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Going to the dealer to get a new rad cap. We"ll see how it goes
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Old 05-10-2017, 01:21 PM #10
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You just said you replaced the tank but it still leaks, I didn't see any mention of the cap. No biggie, just wanted to make sure we knew exactly what was going on so we could better help you.

I would do what Phattyduck said, that is a good start.
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Old 05-10-2017, 01:33 PM #11
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I had the overflow tank boil over once when I overheated going up a hill. All due to a bad radiator cap I believe. Pisses me off that something so small can cause overheating and possibly longer term head hasket problems. Same with those stupid coolant lines underneath going back to the rear heater which rust out on earlier year models (later years are alumjnum). When they finally do leak you lose your coolant and overheat the engine. I think I have a compromised head gasket all because of this.
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Old 05-10-2017, 01:42 PM #12
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Quote:
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I had the overflow tank boil over once when I overheated going up a hill. All due to a bad radiator cap I believe. Pisses me off that something so small can cause overheating and possibly longer term head hasket problems. Same with those stupid coolant lines underneath going back to the rear heater which rust out on earlier year models (later years are alumjnum). When they finally do leak you lose your coolant and overheat the engine. I think I have a compromised head gasket all because of this.
^This is exactly why I bought an Ultragauge to monitor engine temperatures. I have an alarm set on it for 215degrees. If I ever hear that alarm go off, I'll immediately pull over and shut it down. The gauge on the dash is completely worthless until it's too late.

Best 80 bucks I've spent in awhile...
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Old 05-10-2017, 02:56 PM #13
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Well just got back from the dealer to pick up my cap. Opened the hood as soon as I parked it and the overflow tank is boiling.. this does not look good.
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Old 05-10-2017, 03:03 PM #14
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Well just got back from the dealer to pick up my cap. Opened the hood as soon as I parked it and the overflow tank is boiling.. this does not look good.
Compare the old cap with the new one. The OEM caps are known to fall apart and the small center plastic cap and spring end up somewhere in the top of the radiator. If your old one was missing parts, it wasn't holding pressure like it should.
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Old 05-10-2017, 03:08 PM #15
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As a matter of fact I took off the old one to inspect it and saw a piece stuck in the top of the radiator. Here's a couple pics
Leaking coolant from reservoir after driving more than 15 mins-img_3172-jpgLeaking coolant from reservoir after driving more than 15 mins-img_3173-jpg


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