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New to forums but thought someone could benefit from our diagnostic as I work at a shop.
The original expansion tank hose has some type of valve in it. This valve got stuck closed and therefore hot coolant never made it way past the heater valves to the heater core. We even called Identifix and they could not diagnose it. It's a hose that seems to have been updated not to not have a valve in it. But the original has a valve when the "moulded" part is. We found it by sticking a screw driver in it once we know the water was not passing through.
We tried to find this answer on Jaguarclimatecontrol.com but to no avail.
Hope this helps someone. If this is in the wrong section please move correctly. Thanks.
Good call!! Thanks for posting!!
Looking at the way the part numbers have been updated I would guess that cars built after VIN N03872 have the later updated part with no valve, but I could be wrong.
Great info, thanks! Mind if we tie you to the rack and attempt to extract more details?
How did you know to look at this internal valve? Was it by tracing the line with an infrared thermometer gun and seeing a big drop in temperature?
Other than the part number, were there any external differences between the new and old hose assemblies? To help the next guy determine if he's got the new or old style assembly, I'd like to be able to say look for large green dot at this tee fitting, or something like that.
Do you have a picture of this hose installed? It would be very helpful to say exactly where to look.
If a train left Chicago heading west at 40 MPH and another left an hour later traveling east from Sacramento at 60 MPH, where would they meet?
So we made a mistake. There is no valve inside. We cut it open and found a huge ball bearing inside which kept the car from getting heat. Our idea is that the used car dealer was selling this vehicle during the summer and the heater valves and/or a/c control panel were not working, and this was the only way to stop the flow of water to stop the heat from keeping a buyer from buying the car. If someone can edit my original post and clean this up, much appreciated.
Wow, that was some find. We certainly appreciate the update. Your theory makes sense of a quick "fix" by an unscrupulous seller. I've heard of mechanics doing something similar, blocking off vacuum lines by inserting a BB. This would disable the associated component, but everything still appeared intact.
Did you ever get the heat back to normal operation? I compiled an HVAC troubleshooting guide that should help. Post #2 details how to test the Dual Climate Control Valve. Post #6 has more info for no heat:
Wow I’ve heard of some pretty crazy things people do to sell a car. sticking a ball bearing in the heater hose- that’s a new one.
Years ago, I knew a guy selling a Chevy with a small block V8. It had a lifter making a ticking noise. The buyer said if that was fixed, he’d buy the car. The seller removed the two pushrods and turned the engine into a quiet V7.
The buyer drove the car around town like for several more years, totally unaware. I stopped hanging around with the first guy...
Wow I’ve heard of some pretty crazy things people do to sell a car. sticking a ball bearing in the heater hose- that’s a new one.
I don't think dealers are that smart. Is there any chance this is a flow stop check ball for liquid going the wrong way? Get a few hoses on backwards and the check ball works. If I see a box of ball bearings on the shelf at a Jag service center, I'm leaving...fast.
Last edited by davidladewig; Nov 29, 2020 at 03:55 PM.
Is there any chance this is a flow stop check ball for liquid going the wrong way?
Yeah, right! It’s impossible. No way Jaguar would only spend 38 cents to solve a problem.
A real Jaguar solution would involve at least two sensors, a PWM driven valve prone to internal leakage, and a dedicated control module that flags spurious fault codes if prestart voltage is less than 12.6.
The system would get its own acronym, too. Backflow Allowance Loss Limiter (BALL) comes to mind.
.....No way Jaguar would only spend 38 cents to solve a problem.
A real Jaguar solution would involve at least two sensors, a PWM driven valve prone to internal leakage, and a dedicated control module that flags spurious fault codes if prestart voltage is less than 12.6.
The system would get its own acronym, too. Backflow Allowance Loss Limiter (BALL) comes to mind.
Dude..... your so in tune with how we OEM's think.... its scary.
No heat, finally solved. 3.0l S-Type base model
