too late now but wish you had called me ,,,If i send you or you tell them jim sent me,, to js benz you will receive a nice discount,, min 10% or up to to 20% on some work. jim

 

Bob , that was a nice piece of knowledge you give us there. I would give $5 for that! You swapped the sensor to the other car, an it worked! How is a man ,in his driveway suppose to figure that out....

Sorry about the billfold..

 

Hi Jim, I also know J R at J S Benz. He gave me "the tour" of his new facility. We even talked about you and Rudy! He and Victor took good care of me. I hardly felt the rape . . . All is well . . .

Best personal regards,
Bob Davis

 

I think you misunderstood the problem . . . It was not the IAT it was the OAT (the system with the sensor in the front grille that links to the instrument cluster and displays the outside temperature reading on your instrument cluster) . . .

 

Hi Steve, Not sure I understand your post?? In my initial attempts to diagnose the problem, I swapped out the temperature sensors in the front grille between the non-working car to a working car confirming that the sensor itself worked and was not the problem causing the -36 F display on the dash in the non-working car . . .

Best regards,
Bob Davis (Red Dog)

 

A-HA!
John and Ella's SRT Roadster (the higher mileage one) is suffering the same thing. I found that Fuse 15 is not feeding the duovalve (it also feeds the "Rest" pump) and am going to run a new 12 volt battery feed this upcoming weekend. Apparenntly this is going to be another common issue with these cars as they age. One thing - I wonder if this will turn out to be an SRT only thing?

In any event, the OAT thing was something that I read about last year on the Benz forums, that is, that the OAT information is important to the ECU. Your post just confirms what I never really doubted anywa.

 

Wiring breaks? I would be looking for a little rodent making a nest that was off the grid.

 

Yes Dave, We never located the exact location of the wire breaks so I don't know for sure but I also suspect rodent damage . . . Destructive little buggers . . .

 

Thats what i was saying Bob. If it works in both cars , it would be confusing ,trying to diagnose why it didn't work in the original. Lot to be said about running a continuity test on your wires when things don't make sense. Glad your going again..

 

For John and Ella's SRT Roadster (the one they drive quite a bit, it sits in their carport), I went a different way around this. I got into the harness near the duovalve and added a fuseholder and went right to the battery feed. Did my best to make it look good.

Also, I added a note to the card in the fusebox to indicate that "Fuse 15 has been moved to the battery junction box." Fixed in 20 minutes for $5.49 in parts.

 

That looks good. Adding the remarks on the fuse box card shows the pro touch. The car , no matter where it goes will easy to understand.. kudos...

 

Thanks.

Now I know of three cars, all SRTs, that have had this failure. Its starting to make me wonder if there is something about the SRT where this is going to be a 'thing'.

And like I said, John's car is driven year round and sits out in the carport, I do not suspect rodent damage.

 

After reading over this quite a few times now. Does anybody else think this thread should be added to A/C and Heater repair section in the XF repairs/ production numbers /manuals etc. page? I've referred many people to this thread in the past and twice just recently. I think its becoming more of a common issue than one would hope. I also am now thinking mine might be suffering from this as well. Mine being an SRT6 as well. Thank you in advance. Just would like an easier jumping off point for this problem and it'd be easier to find for people having A/C problems.

 

Bumping this old topic too... Making waves on the forums after some inactivity and neglect to fix my poor SRT6...

I'm on a roll (or war path maybe????) with my crossfire now... Supercharger not working all the time, and verbatim same issue described here in this thread both with heat just randomly blowing hot on just the passenger side and sporadic blower motor issues when changing blower speed settings (Say you change from 2 to 2.5 in the dial it blows at full throttle for a second then goes back down to 2.5.... I think I have a triple threat going on with my baby in the repair department lol.... I've stayed on top of it over the last 2 years but all of a sudden, all at once I find that I'm now battling three separate isolated issues... (89,000 miles BTW - Florida car)... My goodness gracious.... what a nightmare if I don't get ahead of my problems...

This is on top of the fact that I've also done the following since I bought this SRT only 2 years ago:

- Crank shaft sensor
- Cabin Filter
- Power steering Fluid
- Primary Water pump
- Power Seat Relay (Siemens)
- Driver side valve cover gasket

What was I thinking is just to sell it... Just kidding, I love this car and would never do such a thing, I'd prefer to complain about Mercedes and their insane engineering that run this car... *rolls eyes*

And she needs an oil change and new tires too.... Shut up and take my money lol.

Thanks!