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Hi Guys, looking for help here . as I was reading this thread about the leaky orange marks and found this on my S-type '08 could it be a the DCCV valve leaking?
if not, any tips on what's causing this is appreciated!
HI Jaguarix, your DCCV valve is easy to find: Jaguar situated it in a not so suitable position: If your expansion tank (from the coolant system with the coolant in there) has a leak at it's outlet (on the bottom of the exp. tank facing backwards), the coolant will drip exactly onto the DCCV some distance below. This would describe best of where to find it. If that valve gets stuck, one effect would be that your heater does not get warm anymore, as the hot water circuit for the heater pipes would not open anymore.
Anyway: Your coolant leak is just behind the throttle body on the air intake. Place a bowl (to catch the coolant) under that spot and pull the clamp back (with pliers) and remove the hose to check out why you have that leak. It looked like that on the flange of my water-pump. It was utterly corroded. One would hope that if you remove your hose and clean the metal surface underneath that you do not find corrosion-hole in there. But if there are depth-depressions (=not yet holes) I personally - if you do not want to buy an new intake - would clean the metal properly with a small rotary wire brush on a drill and apply "liquid metal", let it dry and sand it until smooth.
And there would be a lot of crap stuck on the inside of you connecting hose there: Clean that out thoroughly When all is finished, put the clamp back on AND add a second hose clamp. Check coolant level and refill with the correct coolant. Red coolant would be correct - check it has the right spec. Ford Spec WSS M97B77. You could also use a certain yellow coolant, but I don't want to confuse you too much - I wrote a thread about it:
Peter, thanks for your detailed information and steps to resolve my issue. I’m kind of relieved that my issue is NOT related to the dreaded DCCV valve and I will attempt your suggested steps tomorrow and will report back the results.
Another A/C failure symptom I’m having currently is at low rpm’s the A/c barely cools, but as I speed up at higher rpms it cools again. Any thoughts? Could this possible leak on the throttle body be the culprit as well?
Thanks again for your guidance!
Cheers.
Originally Posted by Peter_of_Australia
HI Jaguarix, your DCCV valve is easy to find: Jaguar situated it in a not so suitable position: If your expansion tank (from the coolant system with the coolant in there) has a leak at it's outlet (on the bottom of the exp. tank facing backwards), the coolant will drip exactly onto the DCCV some distance below. This would describe best of where to find it. If that valve gets stuck, one effect would be that your heater does not get warm anymore, as the hot water circuit for the heater pipes would not open anymore.
Anyway: Your coolant leak is just behind the throttle body on the air intake. Place a bowl (to catch the coolant) under that spot and pull the clamp back (with pliers) and remove the hose to check out why you have that leak. It looked like that on the flange of my water-pump. It was utterly corroded. One would hope that if you remove your hose and clean the metal surface underneath that you do not find corrosion-hole in there. But if there are depth-depressions (=not yet holes) I personally - if you do not want to buy an new intake - would clean the metal properly with a small rotary wire brush on a drill and apply "liquid metal", let it dry and sand it until smooth.
And there would be a lot of crap stuck on the inside of you connecting hose there: Clean that out thoroughly When all is finished, put the clamp back on AND add a second hose clamp. Check coolant level and refill with the correct coolant. Red coolant would be correct - check it has the right spec. Ford Spec WSS M97B77. You could also use a certain yellow coolant, but I don't want to confuse you too much - I wrote a thread about it:
About your low rpm A/C barely cools issue: It's just a thought (probably not much help though) and not based upon Jag experience: My van with an aftermarket A/C system is designed to automatically increase rpm in idle in case of A/C being switched on. All I know is that there is somewhere a membrane responsible to control this. It would have been costly to fix it (I was told - that was before I did everything myself), thus I just left it, and somehow the issue went away over time. It works now fine.
PS: If you ask, how a van fits into my Jag collection: Well, it's kind of a must, as the space capacity in a jag is somehow limited.
Plus, my van looks apart: It's a 2-tone red/white van in the colour-design of a Buick Reviera 1957...
Another A/C failure symptom I’m having currently is at low rpm’s the A/c barely cools, but as I speed up at higher rpms it cools again. Any thoughts? Could this possible leak on the throttle body be the culprit as well?
The coolant leak is a separate issue from marginal AC performance. Fix that leak then peruse this troubleshooting guide:
Coolant Leak
