Coolant leak- I'm flummoxed

bigwinn

bigwinn

Elite
 Lincoln UK
Site Supporter
Evening all

Asking for advice as I am running out of options here.

53 2.5 manual- Ians car! Which is a stunner by the way!

I'll cover off whats replaced:

Expansion tank
upper hose
lower hose
heater to expansion hose
block to expansion hose
water pump

I cant get the fault to appear... so I drive it for a decent distance, no issues with overheating etc. When I observe the car underneath- no signs of leakage at all. I then let it cool and same- no sign of water loss or coolant leak

However- when back in Ians garage there is definite coolant leak (colour and feel say its coolant not brake, AC etc)

Whats really weird is that the leak ONLY shows itself at the back of the drivers side wheel; dripping around the rear wishbone and pools around the drivers wheel

I'm open to suggestions and nothings off the table

Thoughts?

Stuart
 
It will be the only real way of testing the system without chucking parts at it.
Cheap kits on eBay for around £50-£60
 
If the leak is definately coolant by its colour and taste (sweet) then pressure test will be the way to spot any small leak. If it was clear water could it be aircon condensation dropping off when switched off and in the garage?
 
colb said:
If the leak is definately coolant by its colour and taste (sweet) then pressure test will be the way to spot any small leak. If it was clear water could it be aircon condensation dropping off when switched off and in the garage?
Click to expand...

yeah thats what I was thinking re aircon run off
 
the only 'issue' i have is that surely the system is up to pressure all the times I've had it run up to temp??
 
How about a partial blocked scuttle drain on the right hand side that may find itself down where you spot the leakage dripping by the drivers front wheel.
 
colb said:
If the leak is definately coolant by its colour and taste (sweet) then pressure test will be the way to spot any small leak. If it was clear water could it be aircon condensation dropping off when switched off and in the garage?
Click to expand...

Easy to rule out by running it without the aircon being on and see if it still happen
 
Could it be washer fluid coming out of the bottom of the washer reservoir and dripping off the undertray?
 
Zedebee said:
Could it be washer fluid coming out of the bottom of the washer reservoir and dripping off the undertray?
Click to expand...

Thankfully the washer fluid is very blue... and its not blue!

same logic applied to aircon which is usually green!
 
bigwinn said:
Zedebee said:
Could it be washer fluid coming out of the bottom of the washer reservoir and dripping off the undertray?
Click to expand...

Thankfully the washer fluid is very blue... and its not blue!

same logic applied to aircon which is usually green!
Click to expand...

Its condensation that drips from the AC compressor and pipes etc. wouldn’t be green bud. It just water
 
bigwinn said:
yeah thats what I was thinking re aircon run off
Click to expand...
Unlikely to be the a/c in the weather we have had recently. Needs to be pretty humid and very warm to create the amount of condensate you are talking of.
 
Hi Stuart. Have you checked the o-ring on the temperature sensor in the bottom hose. They can weep and drip down, perhaps running along undertray and onto ground by the wheel ? :?
Si
 
patriot66 said:
Hi Stuart. Have you checked the o-ring on the temperature sensor in the bottom hose. They can weep and drip down, perhaps running along undertray and onto ground by the wheel ? :?
Si
Click to expand...

Yep- bone dry Si

:thumbsup:
 
bigwinn said:
patriot66 said:
Hi Stuart. Have you checked the o-ring on the temperature sensor in the bottom hose. They can weep and drip down, perhaps running along undertray and onto ground by the wheel ? :?
Si
Click to expand...

Yep- bone dry Si

:thumbsup:
Click to expand...
Hmmm?The plot thickens :?
 
Stuart , sounds like a split/crack somewhere ...expanding and sealing its self when hot and then opens up when cold and leaks ...?
Normally this is other way around but you never know !
 
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