Thermostat not opening
 

I replaced all my coolant hoses, flush, and thermostat. Well... the suckers not opening. It's not in backwards, and the idiot gauge worked, and went up 3/4 of the way. Thats a little more than usuall. I had no heat as well, the radiator wasn't cirrculating, whats up?

have any leaks?
also may be just a worn down radiator

Double check the coolant level. Might have to remove the t-stat and finish filling the block, then refill the radiator. :tu:

Worn down radiator? Thats a new one for me :) Possible air in the system yet

i would say air in the system causing the thermostat not to even see water. did you make sure the little holes for the air to pass are up at the top of the radiator?

Whats' the little holes? I had no leaks, and my radiator is wore out, but it was circulating fine before i flushed and filled it.

put the tstat in boiling water to verify it opens

if you look at the thermostat, there is either 1 or 2 little holes with some dangling valves in them depending on the maker, they need to be all the way up they are for the air to pass through if its on the bottom they wont work. on 1st gen cummins trucks they are very touchy with the thermostats they have to be installed correctly. and if you got one from napa or oreilly or something youll probably have a problem with it. you need a factory cummins thermostat. i learned that the hard way

x2

ya worn out! ha ha sat here for a minute or two tryin to say the correct term but said heck with it! ha ha

how about clogged lol

It dose sound like you got air in the system blead it out and try again