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Thread: Fixed the coolant leak today, pics Reply to Thread
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Topic Review (Newest First)
04-04-2013 09:54 PM
finalfantasy just replaced my non-svt housing and stat, and was very careful not to torque down the screws to the cover and bolts to head per the warnings of cracking plastic. Although it did say 15ft lbs or something to the head ( dont quote me ) on engine torque specs someone posted on FF.

I also put a little tiny bit of RTV in the corroded pit marks left in the head around where the housing o-ring mates.

Leaked out about less than a half quart, at that rear spot of the trans pan. not 100% sure its the housing area, maybe hose, HOPEFULLY not head gasket. happened after a day driving and then sitting on ramps for 8 days.
01-06-2013 10:48 PM
jvert Looks like I have to tackle this job as well. Good write up.
12-02-2012 11:49 AM
total_telecom try rockauto.com

Sent from my SCH-I535 using FF Mobile
12-02-2012 10:20 AM
terrymeador I need one of those o rings where can i buy one at meador116@yahoo.com Terry Hendersonville Tn 615-403-7783
10-25-2012 11:42 PM
BC_ZX3 You're welcome.
Instructions and pics for you: http://www.focushacks.com/mod/Replac...mostat_housing courtesy of Focushacks (including pic of common thermostat damaged area).
10-25-2012 11:18 PM
Incognito27 Thank you BC_ZX3 Much appreciated
10-25-2012 11:04 PM
BC_ZX3
Quote:
Originally Posted by Incognito27 View Post
" Does only the SVT version have the Plug with a O-ring that fails?"

May i have an answer to this please :D
The SVT model is the only Zetec engined version that has the coolant temperature sensor in the thermostat housing that senses the fluid temperature directly. It uses an O-ring to seal the sensor in the thermostat body as shown in the pics.

The "normal" Zetec (i.e your ZX5) uses a cylinder head temperature (CHT) sensor that measures engine coolant temperature indirectly; it measures the temperature of the metal of the cylinder head near the coolant passages. The CHT sensor is located by the alternator (rear passenger side of the motor). There is no sensor fitting near the thermostat housing for your car and thus no O-ring.

Two different methods of doing the same thing - measuring engine temp.

Therefore, only the SVT has the O-ring that fails. However, the normal Zetec fails in its own way - the much larger sealing O-ring between thermostat housing and cylinder head fails or the housing cracks and leaks or a combination of both. It is theorised this is usually due to the valve cover gasket leaking and seeping oil down the side of the head by the housing. It's a common problem whatever the cause.

Quote:
Originally Posted by Incognito27 View Post
Do i need to :

A) look for a plug with o-ring ?
B) replace the front part of the houseing with the 3 screws and gasket
c) or change the who damn thing because i can't figure out where the coolant is coming from
d) go suck a lemon and complain about it? lol :P
a) No.
b) No.
c) Yes. Leak is likely between thermo housing and head.
d) Umm...No comment.
10-25-2012 10:13 PM
Incognito27 SO i have a leak also.... However based on this thread i am more confused at the end than i was at the beginning

I see this question raise a few time with no affirmative answer " Does only the SVT version have the Plug with a O-ring that fails?"

May i have an answer to this please :D

I have a 2003 Focus ZX5 premium, i replaced a hose with about a 3/4 inch diameter tot he t-stat house already , but have a leak under the t-stat houseing it seems as thats the only place i see coolant leak and hit the ground.

Do i need to :

A) look for a plug with o-ring ?
B) replace the front part of the houseing with the 3 screws and gasket
c) or change the who damn thing because i can't figure out where the coolant is coming from
d) go suck a lemon and complain about it? lol :P
05-24-2012 09:17 PM
coxyboi Am I right in thinking the thermostats housing comes in 2 part's and seals the tstat inside, what is used to seel both part's? Any one got dissected pic's? And this washer/plug that every one had prob's with is it at the front on the under side of the pipes? Schematics would help thanks
05-14-2012 02:03 PM
total_telecom
Quote:
Originally Posted by JohnMichael View Post
It's out of the thermostat housing...let's see if I can get some better pics up.



That's a top shot of the thermo housing, it's underneath towards the front of the housing...



The above pic is of the hole where the plug goes and housing...if you need some more shots just yell!

Rockauto had the whole housing with upper hose neck and thermostat all in one unit for like $40. Just unbolt the old and bolt in the new, its all assembled in one unit!
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