Good afternoon. Just finished up a head gasket replacement on my 02 Disco. Followed the RAVE step by step. Decided to take the Disco to work and it started to blow coolant out of the reservoir overflow tube and cap after about 15 minutes/7 miles. It got hot but did not redlined as I pulled off and shut it down. I followed the coolant bleed as described in the RAVE and still had these results. Anyone have any suggestions or similar problems?

 

I would inspect my radiator, and take temp readings off of it. Get an ultra-gauge asap and TEST / replace the thermostat with an OEM 180 . Bleed it again perhaps a few times.

 

I've taken those into consideration. Everything was fine before the fix but as with anything, it can break. I just replaced the thermostat in August so I'd hope it wouldn't be that. I got it towed home and bled the system. Let it run for 20 or so minutes in the driveway with the heat on and took it out and cannot reproduce the problem.

 

belt routing correct?
exhaust gas in system?

 

Haven't had a chance to do the chemical test yet, hoping to get it done tonight. I checked the belt routing earlier, I guess I will check it again.

 

I wouldn't be surprised if you had an air gap in the system.


Try this bleeding procedure on with a stone cold engine. Do not attempt under normal operating temps.

Pull the front two wheels up on ramps or drive up an incline (the idea is to force the air to travel to the highest point in the system), pull the coolant resevior out of its mounting bracket and keep it elevated with a tie down strap by suspending it from the hood, (be careful not to over stress the fragile hard plastic coolant pipe) open the bleed screw, and begin to fill that sucker up w/ coolant.

Keep filling until you have a steady flow of coolant coming out of the bleed port. I usually allow a pint to a quart of coolant to expel out of the port just to be sure to any and all air bubbles have been fully expelled. Call me delusional, but it works.

Next, replace the bleed screw nipple (while the coolant is spewing out) keeping the resevior elevated. Fire up the engine and rev to 2-3k w/ the heater on full blast for about 3-5 minutes. Keep your eye on the temps. This has always worked for me.

 

Definitely order yourself an Ultragauge or install an inline coolant temperature gauge.

 

This.


Air. when I elevate the front end I get a better bleed.


Before I did the hg in 2013 I was bleeding every couple weeks. I did the hg and might have only bled 3-4 times since July 2013.