DIY Thermostat change EG/ED/EK/DC...

[bennjamin]

hi all.


Disclaimer: The following is provided as a GUIDE ONLY, and neither myself nor Ozhonda take any responsibility for the outcomes of someone else doing the following. You follow these steps at your own risk!


Aim: To change the thermostat on a EG/EK/DC/ED honda.This DIY is accomplished on a EG5 Si , d16a8. IT should be a very similar process on all metioned - if not all Hondas !


Required: 1 x new HONDA thermostat , 1 x phillips head screwdriver , 1 x pair of pliers , 1 x 10mm ratchet piece . 1 x ratchet with extension ( atleast 3inch + ) 1 x 10mm spanner . . . .


Steps:

WARNING ! READ !
Attempt this DIY , ONLY when engine is cool and coolant hoses are under no pressure...BEST if coolant is drained via radiator first too !
HOT coolant can scald (sp?) people !

1.
http://www.ozhonda.com/gallery/data/500/7911-med.jpg
Open bonnet , locate intake arm , locate the connection to the throttle body - there will be a small phillips head screw - undo this screw to loosen the intake arm.


2.
http://www.ozhonda.com/gallery/data/500/7921-med.jpg
Next , undo the following.
1. Unclip the MAP sensor
2. Unclip the PCV inlet with pliers and move aside
3. Unclip the charcol breather pipe with pliers, move aside.
Now the inlet pipe should be free to move.


3.
http://www.ozhonda.com/gallery/data/500/7931-med.jpg
Pull the intake arm off the throttle body - then *TWIST* the intake arm off the airbox. Remove from engine bay.


4.
http://www.ozhonda.com/gallery/data/500/7941-med.jpg
Locate the thermostat housing - it will be located pretty much directly below the LHS of the inlet manifold.
Note , location of 1 sensor , 1 earth wire and 3 x 10mm bolts.


5.
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Remove the collant temp sensor by unclipping.


6.
http://www.ozhonda.com/gallery/data/500/7961-med.jpg
Undo the ground wire 10mm bolt - loosen finally with fingers as to NOT lose the bolt


7.
http://www.ozhonda.com/gallery/data/500/7971-med.jpg
Remove the second 10mm housing bolt.


8.
http://www.ozhonda.com/gallery/data/500/7981-med.jpg
Access the third and final 10mm bolt - with the aid of a extension this should be a problem. Apply pressure and keep it intact !


9.
http://www.ozhonda.com/gallery/data/500/7991-med.jpg
Crack open the thermo housing - an amount of coolant will splash out - nothing too much to worry about.


10.
http://www.ozhonda.com/gallery/data/500/79101-med.jpg
Pull up the thermo housing + hose to horizontal like so. Observe thermo position, crustyness...and non-OEM thermostat ! NO !


11.
http://www.ozhonda.com/gallery/data/500/79111-med.jpg
Slowly shimmy off old thermo - the rubber grommet maybe alittle hard to remove - if so , shimmy off with a flathead screwdriver.
NOTE location of thermostat relative to the housing.


12.
http://www.ozhonda.com/gallery/data/500/79121-med.jpg
Grab your new OEM thermostat - slide on rubber grommet in correct way.


13.
http://www.ozhonda.com/gallery/data/500/79131.jpg
Place new thermo in exact position - following the slight groove in the housing with the bypass on the thermo.



14.

Well , Thats it !

Reinstall in opposite order...and top up coolant as per needed.

Enjoy proper cooling efficiency !

[wynode]

Nice write up ben......but I didn't know hot coolant could scold ppl.......I never knew coolant could talk back ?

:D

[wynode]

BTW Ben, might wanna mention that you should drain the coolant first hehe

[bennjamin]

BTW Ben, might wanna mention that you should drain the coolant first hehe

shhh @ 1st grammatical mistake lol !

Oh , edited too :)

[ECU-MAN]

and dont forget open the coolant bleed nipple, and move the heater control to HOT, and fill up coolant, when steady stream of coolant comes out tighten the nipple.


nice write up Ben

[egSi]

nice write up ben

[wynode]

and dont forget open the coolant bleed nipple, and move the heater control to HOT, and fill up coolant, when steady stream of coolant comes out tighten the nipple.


nice write up Ben
Probably best to just look at the coolant change DIY in regards to emptying/filling up the coolant.

[alzteg]

its a b!tch 2 unscrew...

got my mechanic to do it for $10 instead

[EG5]

remember to bleed the air out of the coolant too

[Dxs]

just wondering.. is there no gasket needed for the thermostat housing? The rubber on the thermostat is instead used as a seal?


and any reason as to be against using a non OEM thermostat?

[alzteg]

There is a gasket... which i got from autobarn or something for like <$10 can't remember but apparently honda sells them for something like $20

OEM is standard and if it breaks it just lets coolant thru regardless of temp... so its hard to warm up your car to run and normal temp... and last at least 5-10 years?

Unless you race alot and want to go aftermarket which will release at a lower temp.

[fatrex]

I've just did my 80k service which include changing the thermostat but I couldn't find the bleed nipple! can any body show me where I'd find it on a dc2 vtir? thanks