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Thermostat Change? 

 

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 Post subject: Thermostat Change?
Posted: Wed Apr 05, 2006 12:51 pm 
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Hey i am going to attempt to put a new thermostat in my 3.9Ltr MPFI

which i have not done before but i guess it cant be that hard can it?

Anyhing i should know, or tips from anyone who has done there?

CHeers. Wez

 

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Posted: Wed Apr 05, 2006 12:55 pm 
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It is so easy it isn't funny. Now, facing the car engine: undo the bottom left radiator hose. (Can be a bit of a b**ch to get off but be rough). Undo the two hoses going into the thermostat housing. Undo the two bolts ontop of the thermostat housing cover, remove the cover. pull out the thermostat and replace.

 

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Posted: Wed Apr 05, 2006 12:59 pm 
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why do u have to take off the bottom hose?

 

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Posted: Wed Apr 05, 2006 1:06 pm 
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thats how i drain out the water. I like that 1 cause its low and away from everything else so causes minimum mess. But i'm sure it really doesnt matter.

 

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Posted: Wed Apr 05, 2006 1:36 pm 
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yeh i know but i mean why drain all the water out? What does that do

Can't u put a new one in without draining it?

 

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Posted: Wed Apr 05, 2006 1:40 pm 
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15 bucks worth of coolant, its not a huge problem. Yeah drain the radiator or you'll be wearing it when you pull everything else out to get to the thermo...

 

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Posted: Wed Apr 05, 2006 1:45 pm 
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i've changed 2 thermostat's on the EF we used to have - never drained it. as long as it's cold, there's no pressure buildup.

 

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Posted: Wed Apr 05, 2006 4:34 pm 
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Blueprint EA wrote:
yeh i know but i mean why drain all the water out? What does that do

Can't u put a new one in without draining it?


If you want to change it without draining do this;

Using a length of plastic tubing, syphon the coolant out of the header tank. This will lower the coolant level to below the thermostat.

Then undo the 2 bolts holding the upper thermostat housing in place.

Remove old thermostat.

Replace with new thermostat and new rubber seal. It is a good idea to smear a little selastic on the seal to help prevent leaks.

bolt down the upper thermostat housing.

refill header tank with captured coolant.

Run engine with radaitor cap off until at operating temp and coolant in header tank is hot.

 

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Posted: Wed Apr 05, 2006 4:38 pm 
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mr_sperm1 wrote:
i've changed 2 thermostat's on the EF we used to have - never drained it. as long as it's cold, there's no pressure buildup.


Yeah I've changed with without draining the coolant too! Usually I do drain it but just couse it's nice to put some new stuff in!

 

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Posted: Wed Apr 05, 2006 4:38 pm 
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Simply using vaseline on the rubber seal is enough.

 

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