Thermastat
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Freshman User
Joined: Aug 2007
Posts: 40
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Thermastat
I went to autozone and they did their computer check thing and it said I needed a thermastat. Are they hard to put in? and also would it be the reason when my truck gets somewhat warm it doesnt want to rev over 2100 rpms?
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
The main way to tell if your thermostat is bad is this: if it's stuck open, the engine takes forever to warm up. If it's stuck shut, the engine overheats. I doubt it's related to your RPM problem but who knows.
I'm guessing this is a 4.9L? Replacing the thermostat is easy. The upper radiator hose comes off and there are two bolts holding the thermostat housing to the engine block - the thermostat housing is how the upper radiator hose connects to the engine. The termostat is inside that housing. You clean the gasket surfaces, put the new one in, seal the new gasket on both sides with sealer and torque the housing back down. The main thing is making sure the thermostat goes in the right direction.
You may or may not lose a lot of coolant; make sure you have a catch pan underneath. I always drain the radiator completely when I do a thermostat because on all my vehicles I always do thermostat, hoses and coolant flush all at the same time.
I'm guessing this is a 4.9L? Replacing the thermostat is easy. The upper radiator hose comes off and there are two bolts holding the thermostat housing to the engine block - the thermostat housing is how the upper radiator hose connects to the engine. The termostat is inside that housing. You clean the gasket surfaces, put the new one in, seal the new gasket on both sides with sealer and torque the housing back down. The main thing is making sure the thermostat goes in the right direction.
You may or may not lose a lot of coolant; make sure you have a catch pan underneath. I always drain the radiator completely when I do a thermostat because on all my vehicles I always do thermostat, hoses and coolant flush all at the same time.
