my 1992 f250 diesel runs cool after it has been idling for 20 minutes,this is after it has been plugged in all night.do diesel engines have thermostats? if so were would it be located. _________________ some days you're a fly,some days you're a f150 windshield.
all engines have thermostats, Im not real familiar with the 7.3 but I would follow the upper radiator hose from the radiator back to the engine the thermostat is usually at the end of it.
The 7.3 diesel thermostat is on the front side of the intake manifold.
It'll look like one of these two once you pull out of the manifold:
or
Here's a quick overview of the R&R:
Removal:
1.Disconnect both negative battery cables.
2.Drain the coolant to a point below the thermostat housing.
3.Remove the alternator and vacuum pump belt(s)
4.Remove the alternator.
5.Remove the vacuum pump and bracket.
6.Remove all but the lowest vacuum pump/alternator mounting casting
bolt.
7.Loosen that lowest bolt and pivot the casting outboard of the
engine.
8.Remove the thermostat housing attaching bolts, bend the hose and
lift the housing up and to one side.
9.Remove the thermostat and gasket.
To install:
10.Clean the thermostat housing and block surfaces thoroughly.
11.Coat a new gasket with waterproof sealer and position the gasket
on the manifold outlet opening.
12.Install the thermostat in the manifold opening with the spring
element end downward and the flange positioned in the recess in
the manifold.
13.Place the outlet housing into position and install the bolts.
Tighten the bolts to 20 ft. lbs. (27 Nm).
14.Reposition the casting.
15.Install the vacuum pump and bracket.
16.Install the alternator.
17.Adjust the drive belt(s).
18.Fill and bleed the cooling system.
19.Connect both battery cables.
20.Run the engine and check for leaks.
or 