6.4 Coolant leak help - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 01-13-2014, 06:56 AM Thread Starter
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6.4 Coolant leak help

I have a 08 f450 6.4L im fighting with on a coolant leak. visually inspecting the coolant leak with the system pressurized it appears to be coming from the lower radiator hose at the engine and something slightly above the water inlet.

my question is what could be leaking above the hose inlet? anyone else had this problem

any help would be appreciated.

-1999 F350 CCLB SRW 2WD 7.3 524K & COUNTING
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post #2 of 9 Old 01-13-2014, 08:36 AM
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There is technically two lower radiator hoses...the upper one sounds like where your issue lies and unless it's been replaced, more than likely that's the cause. The old style have a single internal o-ring because these hoses are a "quick connect" style design and the newer updated ones that came out have a double o-ring. I ran into his issue with mine as well not too long ago. But, shortly after, a new leak showed up and turned out my radiator was leaking as well which didn't show up with my initial pressure test because of the faulty radiator hose....I would replace the hose, and then quickly do another pressure test to make sure the radiator isn't leaking as well. Both the upper section of the lower radiator hose assembly and the radiators on these trucks are notorious for leaking. Radiators due to their design of using plastic tanks on the radiators.

2008 F-250
578HP/1188TQ
JUST ANOTHER FORD
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post #3 of 9 Old 01-13-2014, 08:56 AM Thread Starter
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I'm going to replace the lower radiator hose with both updated hoses. however it still appears there is a leak further up than the hose just not sure what could be leaking

-1999 F350 CCLB SRW 2WD 7.3 524K & COUNTING
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post #4 of 9 Old 01-13-2014, 12:53 PM
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What's done to the truck? May need to replace the thermostat housing gasket too. Depending on mileage, wouldn't hurt to get the t-stat kit and replace them.

2008 F-250
578HP/1188TQ
JUST ANOTHER FORD
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post #5 of 9 Old 01-13-2014, 03:22 PM
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I would do both upper and lower updated radiator hoses and as suggested above also do the t-stats while your there. Also radiator could be leaking. Thats very common.

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #6 of 9 Old 08-21-2014, 04:21 PM
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Quote:
Originally Posted by 04hdfatboy View Post
I would do both upper and lower updated radiator hoses and as suggested above also do the t-stats while your there. Also radiator could be leaking. Thats very common.
Have the same issue...any suggestions on the best parts source to get the hoses and thermostats?
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post #7 of 9 Old 08-22-2014, 06:01 AM
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I use these guys:Ford

I pay a little for shipping but I get it quicker than Sunrise which is on the west coast.


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post #8 of 9 Old 08-22-2014, 07:35 AM
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Quote:
Originally Posted by napalmer View Post
Have the same issue...any suggestions on the best parts source to get the hoses and thermostats?
Here is where I got my ford parts.

AutoNation Ford White Bear Lake | Parts & Accessories

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #9 of 9 Old 08-22-2014, 06:46 PM
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Thanks all...good parts sources
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