I just did headgaskets on my 03 D2 and it’s still over heating. It has a new radiator. All new hoses, new thermostat (I actually returned one thinking it was faulty and got another) as well as water pump, EVERYTHING is new. Now here is my issue, at idle my disco hits 222, there is no flow below the thermostat! The lower hose is ice hold while the others are piping hot. The radiator isn’t clogged, and the hoses are fine. Would it be okay to eliminate the thermostat and just run a Y joint? I’m at my wits end with this truck and need it in 11 days for when I get my license. PLEASE HELP!!!!!!

 

Air in the system?

How did you bleed it?

 

I don’t believe there is air in the system. Heat blows super hot. I bled it by putting it on ramps, lifting the coolant resivoir and burping the system.

 

That is the temp at the sensor.

Put the front end back up and let it run. Turn on the heat. Squeeze the hoses. Watch the temps.

If you have a laser temp gun use that...if all the hoses get higher than your stat temp then you may have a bad stat....I have yet to come across one...except the one I had that someone cut out the center portion.

If you're really concerned, boil it in a pot. I bet it opens.

 

Thermostat.

 

Not the thermostat. I’ve put 3 new ones in to eliminate that being the issue

 

Try running without a thermostat. If you have an old t junction that will accomplish it. If u still overheat you’ve eliminated the thermostat.

Have you tries a different fan clutch?

 

You haven't tested it, I wouldn't rule it out

 

It could be the actual temp sensor that is bad

 

Try this, rev your engine to 2500-3000 rpm and monitor your temps see if they go down. If so, you may have a flow problem. The lower hose will always be a tad bit cooler then the top. But should still be warm to touch. 220 degrees is warm but not overheating. Check your condenser fan see if it’s coming on at all. Check your serpentine belt make sure it’s routed correctly.