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

**bennjamin** · 12-03-2005 02:25 PM

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.

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.

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.

Pull the intake arm off the throttle body - then *TWIST* the intake arm off the airbox. Remove from engine bay.

4.

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.

Remove the collant temp sensor by unclipping.

6.

Undo the ground wire 10mm bolt - loosen finally with fingers as to NOT lose the bolt

7.

Remove the second 10mm housing bolt.

8.

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.

Crack open the thermo housing - an amount of coolant will splash out - nothing too much to worry about.

10.

Pull up the thermo housing + hose to horizontal like so. Observe thermo position, crustyness...and non-OEM thermostat ! NO !

11.

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.

Grab your new OEM thermostat - slide on rubber grommet in correct way.

13.

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** · 12-03-2005 07:39 PM

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

**wynode** · 12-03-2005 07:42 PM

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

**bennjamin** · 12-03-2005 08:24 PM

Originally Posted by wynode

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

shhh @ 1st grammatical mistake lol !

Oh , edited too

**ECU-MAN** · 12-03-2005 11:17 PM

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** · 13-03-2005 03:28 PM

nice write up ben

**wynode** · 13-03-2005 10:01 PM

Originally Posted by 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

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

**alzteg** · 17-11-2005 11:50 AM

its a b!tch 2 unscrew...

got my mechanic to do it for $10 instead

**EG5** · 28-11-2005 11:33 PM

remember to bleed the air out of the coolant too

**Dxs** · 06-12-2005 02:43 PM

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** · 06-12-2005 03:51 PM

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** · 10-04-2006 11:41 PM

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