there is a petcock on the bottom of the radiator, passenger side. it is tricky to get to, but it can be done.
Bottom or rear of radiator
Not entirely sure, but if it is at all like a 95 then its a little white nob on the lower outer driver side of the radiator.
Engine coolant temp sensor error (low temp indicated). I would suggest replacing the thermostat.
No, it has one oil drain plug.
Brad Van Pelt #91
in my 91 is 30 gal
Passenger side kick panel
Corroded freeze plugs, blown radiator hose, corroded radiator (My 96's turned green and crumbled away)
It would be really helpful to know which of the 3 engines installed in this van, you have. So go here: http://autorepair.about.com/library/firing_orders/bl-chevrolet-firing-91.htm and pick the correct engine.
If the radiator is cracked then the vehicle has ran dry on coolant. This would cause the radiator to crack if there wasn't any coolant.
On the intake manifold.
10 us qts dry
no sensor only a thermostat
Make sure your coolant is FULL, it will stop reading if your coolant is low and the low coolant light doesn't always work. My radiator was full and i took the thermoustat off to find the block hlaf empty on my 91. Paco
speedometer is not working 91 astro van other instruments are
Drain about 1 gallon of coolant from radiator Follow upper radiator hose to engine housing Remove housing Note how thermostat is instaled in housing Clean both ssurfaces Replace thermostat and gasket Re-fill coolant slowly to prevent an "airlock" Start engine and check for leaks Run engine to normal operating temperature with heater on Check coolant level
Questioner doesn't give the year of their Jeep - but - the draincock on my 91 Cherokee Laredo is near the right headlight. I had to remove the grill, and it's just a few inches back, nestled between the headlight housing and the edge of the radiator. Mine is tough to get to and when I drain it, coolant gets EVERYWHERE.
get an oil change
If it's leaking clear water, probably a bad door seal or a plugged cowl drain or a plugged AC evaporator condensation drain. orIf it's leaking engine coolant, probably a bad heater core.
And where is it on '91 Chev. sil. 3/4 2500?
153 cubic inches