Mx13 heater hose fittings on block

They can break off which you will have to extract the broken threads. I have a couple small guys that can reach behind with the air cleaner off. Its blind and by feel and very tight.

Only other choice really is to pull the shifter cover.

 

They have been known to break while going down the road and dump all your coolant in a hurry.

 

Varies by model/ year.

Sleeper is usually 3. Never seen 4.

 

Can 100% confirm, had the one on the back of my block break off at the block and dump my coolant. Also had both on the side of the block break and dump all my coolant a few days before that....before you ask i didnt know about the one on the back till it broke.

As to getting them replaced also ensure you check for the and i kid you not....PAPER gaskets, it tends to leave bits behind that do really really bad things to your coolant system.

 

Internal pipe wrench works swell if they do twist off. These can be had at any hardware or home depot. The plastic threads turn out pretty easy after the hex and the oring break off.