I have a 1999 D2. Here’s what’s happened so far.

I was off roading and the entire top of the thermostat ripped off. Blowing all the coolant out. Didn’t really have a choice due to not being in cell reception​​​​​. Had to jury rig it and drive it to the trail head 8 miles away.

Since then it was taking about 1/2 a reservoir of coolant a day. Thought it was a coolant bleed issue. It wasn’t. It also overheated once going up a steep grade. I wrote it off as running straight water.

Yesterday it overheated again. I was able to get it home. But all the water seems to of blown out.

My question is

1) Did I blow the head gaskets?

2) Did I blow the block.

and how do I tell which one I did?

 

Hi.
Look for water in oil, water dripping. Inspect the spark plugs. One should show symptoms. That side is the one in need of gasket. It is common to find opinions to replace both sides; will be your decision. I did only the driver side 8 years ago with head resurfacing and went fine.

 

Yes you blew the head gaskets. Block is unknown. You can take the chance and just do HG, or you can pressure test the block once the heads are off. Only 15-25% chance you cracked the block.

 

Did you replace thermostat?

Are you getting any misfire codes?

Did it overheat when the thermostat blew apart or did you catch it before that happen?

My stats top opening/port to manifold cracked off once, clean, had enough left to slide hose back on and drive six hundred miles home...but l caught it before it overheated...saw steam and got pulled over...no permanent damage.

I'd check cooling system for exhaust gases before l jumped to conclusions about anything. You could have a bad cap, over-pressuring system...do investigative work forst...not head gaskets first.

 

No misfire codes. Only code I have is for the oxygen sensor. Bank 2 sensor 1.

It overheated when the thermostat blew apart.

Pretty sure it’s not a bad cap. It’s a new cap that’s a year old.

 

@The Ocho I just replaced a 1 year old cap it was no good
Also how hot did you get did the warning light come on into the red into the yellow ?

 

Oxygen sensor code new, or been there? Coolant kills 02s

 

You can get a free pressure test kit at Advance and pressure test it. If you blew the HG it will not hold pressure.

 

Just pulled the heads off. I have a shiny piston…….looks like I need a new block.

 

Which cylinders show signs of anti-freeze?