Thermostat housing o-ring?
#1
01-31-2021, 09:43 PM
Thermostat housing o-ring?
While under one of our X-Types today I noticed a very minor coolant leak at the thermostat housing and I'm going to guess that it's likely coming from the flange.
Does anyone have the part# (OEM, Dorman, etc.) for the o-ring? It appear that Jaguar wants you to buy the upper radiator hose assembly (that'll be the day that I spend $100+ to repair something that an o-ring or RTV will fix!).
TIA
Does anyone have the part# (OEM, Dorman, etc.) for the o-ring? It appear that Jaguar wants you to buy the upper radiator hose assembly (that'll be the day that I spend $100+ to repair something that an o-ring or RTV will fix!).
TIA
#4
01-31-2021, 11:33 PM
Veteran Member
O-ring failure is a very rare occurrence with the cooling systems components. Unless it was originally installed incorrectly or the fasteners have come loose it is unusual.
Most likely you have a crack in one of the components. The only way to isolate is to due a cold pressure test of the system.
Most likely you have a crack in one of the components. The only way to isolate is to due a cold pressure test of the system.
#5
02-01-2021, 09:50 AM
#6
02-01-2021, 11:25 PM
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G'day Blown Kitty,
What I would do is hose off all avidence of leaking coolant and then drive the car for a while and have a good look around under the hood particularly around the front of the engine to determine where the leak actually is. In my experience it is unlikely to be a dodgy 'O' ring or loosened bolts.
When my car leaked it was a cracked fitting with leaking coolant running down onto the thermostat housing.This fitting is as Jaguar call it 'Top Radiator Hose' or P/N C2S43430 or # 7 in the above diagram. It is the 'T' piece that cracks and leaks but you can't just buy that piece separately it comes with several pieces including a thermostat.
If it is the 'T' piece you may be able to repair it with some sort of epoxy but I have never had any luck with this sort of repair as the internal pressure of the cooling system eventually forces the epoxy loose and the leak is still there.
When I did my repair I bought the whole thing, as there is no choice, and replaced the lot and have had no problem since.
Cheers,
Jeff.
What I would do is hose off all avidence of leaking coolant and then drive the car for a while and have a good look around under the hood particularly around the front of the engine to determine where the leak actually is. In my experience it is unlikely to be a dodgy 'O' ring or loosened bolts.
When my car leaked it was a cracked fitting with leaking coolant running down onto the thermostat housing.This fitting is as Jaguar call it 'Top Radiator Hose' or P/N C2S43430 or # 7 in the above diagram. It is the 'T' piece that cracks and leaks but you can't just buy that piece separately it comes with several pieces including a thermostat.
If it is the 'T' piece you may be able to repair it with some sort of epoxy but I have never had any luck with this sort of repair as the internal pressure of the cooling system eventually forces the epoxy loose and the leak is still there.
When I did my repair I bought the whole thing, as there is no choice, and replaced the lot and have had no problem since.
Cheers,
Jeff.
#7
02-02-2021, 01:06 PM
G'day Blown Kitty,
What I would do is hose off all avidence of leaking coolant and then drive the car for a while and have a good look around under the hood particularly around the front of the engine to determine where the leak actually is. In my experience it is unlikely to be a dodgy 'O' ring or loosened bolts.
When my car leaked it was a cracked fitting with leaking coolant running down onto the thermostat housing.This fitting is as Jaguar call it 'Top Radiator Hose' or P/N C2S43430 or # 7 in the above diagram. It is the 'T' piece that cracks and leaks but you can't just buy that piece separately it comes with several pieces including a thermostat.
If it is the 'T' piece you may be able to repair it with some sort of epoxy but I have never had any luck with this sort of repair as the internal pressure of the cooling system eventually forces the epoxy loose and the leak is still there.
When I did my repair I bought the whole thing, as there is no choice, and replaced the lot and have had no problem since.
Cheers,
Jeff.
What I would do is hose off all avidence of leaking coolant and then drive the car for a while and have a good look around under the hood particularly around the front of the engine to determine where the leak actually is. In my experience it is unlikely to be a dodgy 'O' ring or loosened bolts.
When my car leaked it was a cracked fitting with leaking coolant running down onto the thermostat housing.This fitting is as Jaguar call it 'Top Radiator Hose' or P/N C2S43430 or # 7 in the above diagram. It is the 'T' piece that cracks and leaks but you can't just buy that piece separately it comes with several pieces including a thermostat.
If it is the 'T' piece you may be able to repair it with some sort of epoxy but I have never had any luck with this sort of repair as the internal pressure of the cooling system eventually forces the epoxy loose and the leak is still there.
When I did my repair I bought the whole thing, as there is no choice, and replaced the lot and have had no problem since.
Cheers,
Jeff.
I'll take a closer look around the area, I only discovered the leak while replacing the #2 bank upstream o2 sensor (and that was fun..).
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