I have just purchased a 2004 Discovery with only 55,000 miles and it is already giving me problems. This first major problem is that it is leaking coolant. Took it to a local shop to do a coolant pressure test and they are not 100% sure but they think my head gasket on the drivers side is bad, they also mentioned the intake manifold (lower) gasket could be bad. they were not 100% because he couldn't see exactly where it was coming from in the rear. I would really not like to get into replacing a head gasket. I want to replace the spark plug wire and plugs and i know i need to take the upper manifold off to get to the coil pack. They said if i do that i could get a better look at where it is coming from.
2) When ever i park for a few few hours the drivers side rear suspension is slammed. But when i start it back up it starts to pump up and stays up while i drive. i don't hear any leaking from the air bag. but if i hang around for a while i will here a sharp hiss from a silanode or something and it will drop and inch or two. Seems like a sensor or the air system is dropping the rear and not due to a leaking air bag. Can something be reset or a part replaced to fix this??

3) My window goes down and not up. Took it apart and found that the plastic wheel was broken. Engineered my own wheel with some washers and nut and bolt ground it all down smooth and counter sunk the bolt using a countersink head. Took the motor apart and cleaned all the connections. Put it all back in. it goes down smooth but when it goes up it will only go up a little then make a terrible grinding sound like its trying to engage the gears but they are slipping due to weight or stress on system. I pretty much just put it all they way up but it doesn't stay 100% up more like 98% with a little wind noise. any suggestion if i need to replace the regulotor or the motor or could it be an alignment issue. even when i push it up manually seems to take a little more effort than i have experienced w/ other vehicles.

 

You need a new window regulator.
www.roverlandparts.com

Shut the truck off and with a spray bottle full of soapy water spray all around the rear suspension, it is bubbles you have found your leak. Most likely a loose fitting.

Head gaskets are the #1 repair on DII's. DexCool is corrosive and if it is not properly maintained it will eat the gaskets.
It is supposed to be changed every 3 years or 45,000 miles.
Goodluck.

 

also,,,

you DO NOT have to remove the intake manifold to get to the coil pack. all you have to do is remove the metal piping that runs behind the manifold and you will have enough access to reach the pack. it takes a little bit of hand contortion but i was able to replace my plugs wires in about 2 hours.