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When you service the cooling system.
spring goes toward engine
its located beneath the air intake on the front side of the motor
The thermostat is inside the housing, it is on the motor where your upper rad hose connects to, hope this helps
I had the same problem with my 98 jimmy I repalaced the water pump have had heat since.
remove the 2 bolts that hold the thermostat housing to the intake manifold which the upper radiator hose attaches to the housing then just pull the thermostat out and replace.
check the thermostat see if there is one, if there is it may be stuck open.
It is on the left or right side of the truck by the fender well on the engine.
The Thermostat on the jimmy is located on the engine end of the top radiator hose. Just simply find the hose on the top right hand side of your radiator and follow it to the engine block.
plugged radiator bad water pump bad thermostat
follow the large hose leaving the radiator it will end at the thermostat top center front of the engine 2 bolts off it goes
The thermostat is on the water pump, left side at the hose connection.Left side as in the passengers side?the thermostat is in the housing that connects to the upper radiator hose. there are two bolts that hold this housing to the intake manifold.