running hot / water rushing sound

[BigTal]

hey guys,
Im posting this for my dad, he's had some issues with our disco.

My dad was coming home from dropping me off at the airport right after Christmas break when a bunch of stuff happened, apparently the water pump blew, serpentine belt broke and a few other things. We got the water pump replaced and everything fixed up and few problems have remained.

first thing, the engine is running hot - its not actually overheating but the guage keeps showing the engine getting hotter and hotter, temp goes above the red but it doesnt actually overheat. It only takes a trip to the local store and above the red. Nothing happens though, being our only car, my dad had to take it a good distance north to pick something up and it was red the whole time - car never overheated or anything. Nothing steaming out of the engine, nothing leaking under the truck.



and secondly, most likely related, he says there is a sound of rushing water behind the dash/firewall area - thats all he could describe it as. He said the first time it happened he pulled his feet up from the pedals, thinking water was about to dump onto his feet. Again, nothing steaming, nothing leaking.

You guys have any idea what it could be?

We took it back to our mechanic replaced the thermostat not too long ago and the dude had no idea what the rushing water sound was. He also said for us to look around and see if anyone had any ideas what the issue could be, he didnt want to put in a new radiator if we dont need one.

Thanks to anyone that can lend a hand

Oh, its a 1997 Disco 4.0 w/ 130,000 miles

 

[Moose]

Could be an air pocket in the cooling system (they seem to be going around ).

Is it hot on the top and cool on the bottom, or vice versa? Is the top radiator hose hot when the engine's been running or not? You can open the fill cap and run the engine with the truck parked on hillsides and try to "burp" the system, and others have squeezed the top radiator hose while the truck's engine is running (the cap is open for these). Otherwise there are vacuum systems to get the air out.

Could also be a blockage in the radiator.

 

[joey]

I think Moose has this one.... you have air in the system.... it probably was not filled correctly.

When filling the Rover, you have to have the heater on and motor running after you get it partially filled, so it doesn't leave an air pockets.

You probably have an air pocket in the heater core.