I have a 97 12 valve got home from work with coolant all over the a arm and coolant is foamy is it the thermostat housing leaking 

If it is that noticeable on the a arm follow the trail up and see.

Hard to tell where exactly it’s coming from truck doesn’t over heat or smoke doesn’t have power loss either

The water should be steaming if straight out of the block and at temp.

Truck was maybe 150 when I got home and no steam

Then i guess you have to follow the water.

Edited March 13, 20187 yr by dripley

10 hours ago, 975speed said:

is it the thermostat housing leaking 

 

Cummins only uses a rubber o-ring for sealing the thermostat. 

 

There is the little bypass hose on top there double check it. Check for cracks in the block and if you have a 53 block which are known to crack on the passenger side. There is the heater hose on the passenger side that might be leaking too.

Wherever it’s leaking from its covered the the front passenger suspension with antifreeze in 30 minutes 

The easiest way to chase leaks is on a cold dry engine. Pump up the coolant system with 16-18 PSI of pressure and watch for the coolant to flow. Flow the coolant trail back ot the source of the leak.

Ok cause as soon as I started it this morning I could see a little seepage from either thermostat or head

Could the hose between the head and thermostat be busted causing a leak