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thermostat replacement tip

 
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Old 17 Jan 2011, 03:17 pm
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Join Date: Oct 2005
Location: northern, ca.
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Default thermostat replacement tip

all - just replaced the thermostat on my 2003 gt and thought i'd pass a tip or two on.

make sure the engine is cold.

remove the radiator cap.

use an old turkey baister to suck out the coolant from the top of the housing neck - down. capture as much coolant as you can, because when the housing is removed, some coolant will spill out. try to have rags or a larger catch basin underneath.

remove the right housing bolt with a 10mm deep socket.

remove the 10mm nut holding the a/c suction line bracket. move the bracket over to the side or skid it down the suction line so it's out of the way, then remove the bolt underneath this nut.

go to the right side of the radiator and use a pliers to squeeze the clamp holding the upper radiator hose. "walk" the clamp down the hose until you can pull the hose off. note: leave the clamp that's attached to the thermostat housing - on (other end). unless you have a curved needle nose pliers - you won't be able to get to it, as it is under the intake manifold.

grab the thermostat housing, wiggle it as you pull it up and to the left. watch out for falling coolant. you should be able to pull the housing up and to the left enough to where it will stay put. now retrieve the old thermostat. i used a long flexible claw grabber. btw: my old thermostat snapped/broke into an open position.

with the housing still propped up, (by feel only) use two fingers from each hand to insert the new thermostat up and into the underneath side of the housing. see the attached pic for the area where the housing's notch MUST line up with the new thermostat's o-ring tab. this MUST BE aligned correctly, otherwise the housing will not "sit/seat" correctly and all hell will break loose.

the thermostat (if the o-ring seating correctly) will stay up into the housing. slowly lower the housing over its holes and bolt it back together. switch back and forth between bolts giving them a half turn each until very tight. do not over tighten, as the housing is made of plastic. reattach the a/c line bracket and nut. reattach the upper hose's clamp. fill the neck to the top with 50/50 coolant (50% distilled water - 50% coolant). put the radiator cap on.

start engine. turn heater to high. check for leaks.
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Old 17 Jan 2011, 03:25 pm
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Thumbs up Re: thermostat replacement tip

thanks pppt03turbo this is a job i have planned for next month when the weather here warms up a little,did you bled the system after refilling it?
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Old 17 Jan 2011, 03:28 pm
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Default Re: thermostat replacement tip

well if he did not he is gonna have some problems but the bleeder is right below the thermostat and easy to get to
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Old 17 Jan 2011, 03:30 pm
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Default Re: thermostat replacement tip

no - i plan on monitoring the coolant level using the coolant recovery bottle as a gauge, as well as the coolant level at the neck (when cold - under the radiator cap) over the next few weeks.
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Old 07 Dec 2012, 07:12 pm
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Talking Re: thermostat replacement tip

thank you ppt03turbo this helped me out so much!!
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Old 07 Dec 2012, 07:55 pm
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Default Re: thermostat replacement tip

ptred,

Here's a couple of pictures that might help.



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