Hello all,
I notice that I have a major coolant leak on my 04 Discovery II. I took a picture of it and am attaching. Curious to see if I can do this repair myself since I recently got the manual and tools and don't have much mechanical experience but am a quick learner. When the engine is running, the hose seemed to be sticking out more than the picture shows and coolant was gushing out. Thanks for your input and suggestions.
Reza

 

Yes, the various small coolant lines on these trucks are brittle and prone to breaking. My suggestion is to replace these plastic lines with hose... You'll have much better results. Find the right size hose at the auto parts store, then buy the whole spool and replace them all. It's an easy mod that will save a lot of headache.

 

Thanks....can u tell me from the pic where this particular line is connected to. I'm trying to reference it in the manual to know where to start.

 

unless your sure it one of the throttle body heater line, you should use a pressure tester BECAUSE that is were most timing chain cover tend to leak.at the top of the engine under the ac or alt.

 

The 3/4"dia metal line where you show "LEAK" is the supply to the heater core. It is held in place by a 6mm bolt and has an o-ring on the pipe which seals inside the lower manifold. It should be a tight fit pushing it in. If your bolt is intact and tight, then you have an o-ring problem or the metal pipe is damaged.

 

If the black plastic line that you mention leaking is indeed the one leaking which is the line running under the throttle cables in the picture. That runs between the the throttle body and the coolant reservoir. This line is easily replaced with higher quality hose and clamps as i mentioned earlier.

 

So the O ring was the problem as Shade Tree diagosed. It was basically vaporized when I got the pipe. I installed new O Ring, put everything back together....no more leak BUT I still can't get my heater to warm up? Any ideas?

Thanks
Reza

 

You probably need to follow the proper coolant bleed procedure which includes lifting the overflow tank out of its location and holding it as high as the hoses will allow, while at the same time opening the bleed screw on the T connection at the top of the radiator.

This is done with the engine cold, not running, not warm.

keep putting coolant into the reservoir until a steady stream comes out the bleed screw, then close off the bleed screw (without over-tightening.) Then top reservoir to the fill line.

Since you opened the system at the heater core air got in at that point.

It may take a few times doing this.

drive truck afterward, turn heat up, allow full circulation of system.

wait until engine is completely cold again and repeat bleed procedure as needed.

 

Ill try that now. Thanks

 

Worked. Thanks for the great advice.

Reza