Sounds like the same trouble I am having. Coolant was a little low so I added some and then about 10 minutes later it was coming out at high pressure from the overflow hose. I know I didn't bleed it right so I parked it and decided to look here for help.

Any help would be great.

2004 Discovery II HSE 4.6L

 

If you want some help, send me your tele number and I'll call and walk you thru what to do and check.

 

I would love the help. I am new to the forum and don't see a way to send private messages.

 

click on their name on their post.

 

Didn't notice you were new her so you can't PM me yet.
mjdiscomike21@gmail.com

 

Thanks I just sent you an email.

 

Just joined the forum, having almost same problem on a 2000 P38 4.0. Replaced head gaskets, radiator a couple of thermostats flushed heater core, pressure holds steady. Heat is low at idle, and I notice bubbles going into coolant reservoir one every 10 seconds or so even after driving for a bit. Temp holds fine at idle and can test drive a few miles with no problems, then all of a sudden it overheats. Its driving me crazy.. would like to talk to Disco Mike if possible. Thanks !!

 

Im i the same boat..replaced the lines, hoses, t stat, radiator, and my truck 99" Disco II does the same thing good for a 20 minute drive then BAM overheat. What is this mysterious desease? HAve you had any further luck with it? Let me know!

 

I am about to drain the coolant on my 2004 MY Discovery due to unexpected overheating issues last week. I have a new Thermostat from the Bellevue dealer, but the RAVE .PDF I think is not for the MY 2004 engine? I could be wrong about that.. But my question is where is the coolant drain plug? I think it's right next to the oil filter - lower left as you look at engine. (Both of the plastic pan covers obscure most of the engine & will not come out unless I remove the steering damper.)

 

Re-checking the RAVE .PDF again, I can see 1 screw bolts on LH engine block directly 18" below Oil filler pipe. This is a hexagonal bolt orientated upwards. I would think that to release coolant fluid they would point down, & the Workshop .PDF shows square headed bolts.
The major visual blocker is the plastic under pan panel that only has the circular access panel for changing the oil filter.
I can not remove this plastic panel due to the steering damper being in the way.
(Car is in my garage at home and I can not get enough leverage on the bolts to remove the damper by just lying on the ground underneath, the car needs to be raised which I currently do not have the equipment for.)
As you can see I am new to this forum so any direction would be appreciated.