i have a small leak of anti freeze, on my thermostat housing for st170 54plate.... according to service history the housing has alreasy been replaced a few years ago due to a leak
im told the housings can crack but it appears to be leaking around the plug ...(which seems to be a redundant part) does anybody know if ordering these from ford they come with the o-ring suited? i have ordered the replacement plug and spring clip from ford all for £9 as the entire housing was going to be £94 inc vat
the part number for the plug was FINIS 1150991

 

Very very very common on the st170, it's the seal on the plug under the housing that is leaking. New plug and seal, and maybe a bit of sealant around it too just to make sure.

 

Are the plastic trim covers also liable to breaking the clips off because i snapped one clip off and superglue isnt doing a great job at the mo lol!

 

When i changed my housing i bought a viton o ring to put on there,only a quid to buy and no leaks

 

does it matter if you put the clip in...so that you pushing it away from you as opposed to how i removed it which was to pull towards the bulkhead.... the plug had been bodged by a garage before as it had sealant on it.

so when they crack where abouts do they crack? any photos? the new plug has stopped the trickle down the bellhousing but i seem to have always had a slight drip after running the car which comes from the black plastic strip that is directly under the radiator....no pipes seem to be leaking etc though is this likely to be condesation? although it smells like weak coolant (the mix in my car is 70% coolant i would say after doing the plug i topped up with a strong mix) also i dont think its a leak as surely it would be hot not stone cold especially notice this after a journey when engine is hot.... seems odd that it stops after about a pipette worth of fluid everytime and sometimes notice a small wet patch on drive about size of a £2 coin

 

Hi was the plug hard to change mine is also leaking did you drain radiatir and is it just pull out and push in or do i need tool thanks glyn

 

Anyone help thanks

 

Remove u shape clip pull out with long nose
Pliers and refit new plug and refit clip you will loose a litre at least of antifreeze coolant ...its the waternin the head etc that you loose

 

Just do it fast so you dont loose all your fluid get the new one ready and bung it in

 

Thanks alot guys i might just empty radiator why im doing it then, loving this forum thanks glyn

 

hi i have a st170 when i put the brakes on i can hear a clicking sound coming from the front of the car and the same when i reverse and apply the brakes its the same !!! any ideas guys . sam

 

Hi I bought a new thermostat for my st170 everything looked fine except where the sensor gose was blanked which I drilled out now there is where the leak is happening dose anyone know where I can get the right thermostat

 

Hi from NZ . Anyone measured the O ring size / groove for this blanking plug, before I remove the plug, cant get this plug at the moment, if not will measure myself and look up my world O ring book.
and have the car on stands for a couple of days.