sudden major coolant loss???

stucart · Post by **stucart** » Sat Dec 19, 2020 6:48 pm

Got the F Type out to clean and dry it ready for hibernation, had a run after the wash to dry brakes etc, got back and opened bonnet, doors and boot dry off the shuts, thought i could smell coolant ? Look at road and its a wash with it!!!
Engine was running, look underneath and its running off undertray front nearside, low coolant display in dash , so quickly put it in garage (by now its dark)
Got torch and look down LH side of engine, undertray has it pooled on nearside???? Cant see where its coming from??
Help, anyone had similar or can suggest what's likely to fail suddenly, hose? water pump, radiator?
Curiously i've noticed a whiff of coolant for a while previously but kept eye on the level in expansion and its stayed the same virtually? Seems like whatever it was has given up, hopefully a hose would be nice (so long as it isn't under supercharger)

Look forward to your replies.
(had to happen now instead of light nights, I hate cars!!!)

scm · Post by **scm** » Sat Dec 19, 2020 7:00 pm

Could be the plastic pipes - lots of reports on the US forum about these becoming brittle with heat and leaking. The bad news is that they're a PITA to get at - I thiink it involves removing the supercharger. The good news is that the parts have been redesigned so shouldn't give problems in the future.
https://www.jaguarforums.com/forum/f-ty ... al-240307/
https://www.jaguarforums.com/forum/f-ty ... ed-197383/

If it is your issue, some related part numbers are (no idea how many are relevant):

Connector tube AJ811997
Outlet pipe AJ813865
Outlet pipe o-ring (2) AJ811350
Engine coolant pipe AJ813917
Radiator coolant hose T2R7744
Engine coolant pipe C2Z28258
Heater outlet pipe, crossover pipe AJ814007
Thermostat kit C2Z19929
Expansion tank overflow tube ("radiator header tank bleed hose") T2R5910

Lunar · Post by **Lunar** » Sat Dec 19, 2020 8:35 pm

Yep, “Y” pipe under supercharger - crap design, but new ones supposedly improved. Had that, and also a water pump replaced under warranty at different times. When “Y” pipe went I thought it was smoke at first

RPSN · Post by **RPSN** » Sat Dec 19, 2020 9:32 pm

Have a look at this......

viewtopic.php?f=27&t=4525

scm · Post by **scm** » Sat Dec 19, 2020 11:35 pm

Lunar wrote: ↑Sat Dec 19, 2020 8:35 pmWhen “Y” pipe went I thought it was smoke at first

When the expansion tank broke on my XK8 people thought I had a steam engine under the bonnet as I drove it to the garage for a fix!

stucart · Post by **stucart** » Sun Dec 20, 2020 9:10 am

Thanks for replies,
I'm hoping it's not the *Y* piece under the charger, there was no steam or anything
(bear in mind it was hot engine at normal temp on gauge)
i didn't notice till saw flow of coolant across the tarmac so I'm leaning towards something low down near bottom of radiator,
I'll have another look in daylight today and report later.
cheers

Lunar · Post by **Lunar** » Sun Dec 20, 2020 2:58 pm

If the fans weren’t throwing coolant around under the bonnet it sounds more hopeful - fingers crossed for you and let us know how you get on.

stucart · Post by **stucart** » Sun Dec 20, 2020 6:45 pm

Had another look ,but alas cant see anything without removing undertray and shroud around radiator, sometimes you wish the bonnet didn't open forward!
Decided to leave it for another day as it started to rain hard again!!
As Lunar has said there doesn't seem to be any over the engine only in/on the undertray so hopefully its low down.

stucart · Post by **stucart** » Tue Dec 22, 2020 5:52 pm

Put the car onto ramps today and removed undertrays to expose bottom of the radiator and hoses, there's plenty of coolant around that area !
(surprising how many leaves and crap there was as well)
But unfortunately nothing obvious that was split or ruptured ,without refilling with water its impossible to diagnose I feel, so for the moment the car is hibernating under its cover as it is till warmer weather returns.
I can then refill with just water without fear of freezing to locate leak!
Ctek on and SORN'd from end of month.
Roll on Spring

RPSN · Post by **RPSN** » Tue Dec 24, 2024 4:35 am

stucart wrote: ↑Tue Dec 22, 2020 5:52 pm Put the car onto ramps today and removed undertrays to expose bottom of the radiator and hoses, there's plenty of coolant around that area!
(surprising how many leaves and crap there was as well)
But unfortunately nothing obvious that was split or ruptured ,without refilling with water its impossible to diagnose I feel, so for the moment the car is hibernating under its cover as it is till warmer weather returns.
I can then refill with just water without fear of freezing to locate leak!
Ctek on and SORN'd from end of month.
Roll on Spring

Hi,

I'm reviving your topic which is of interest to me.

Did you manage to determine the cause of the engine coolant leak and fix it? I'm assuming it wasn't the 'Y' pipe etc?

sudden major coolant loss???

Jaguar F-Type Forum