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Discussion Starter · #1 ·
Car won't start ... temp gauge stuck on red ... a mystery to solve.

Hi guys

I hope someone out there can shed some light on this.

Background: 2003 Range Rover with 156,000 well looked after miles. Having just spent a week up in the snow driving around 1000 trouble free miles I am on the way to the airport at 4.15am to drop my mate and his family off and all of a sudden I feel a lurch, the car goes into some sort of restricted performance mode, air suspension shuts down and I roll off to the side of the road .... (and urgently call a cab to take the crew to the airport)

As I pulled over the car was running albiet rough and the temp gauge was all the way to the red zone - however immediately prior it was not running hot - I know this as moments before I looked at the outside temp gauge to tell everyone that it was close to freezing in Phoenix. As the car was running roughly I turned it off - when I went to restart it - NOTHING .....

Had the Rover towed to a British Auto specialist and later that day when I turned the key to start - still nothing and the temp gauge remains in the red.

Car has a new battery - there were no coolant leaks or warning signs ... car was running like a top prior to this incident

Was it the Professor in the study with the candlestick? if not what else could it be?

perhaps a faulty temp sender?
 

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2002-2005 Range Rover MkIII / L322
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Re: Car won't start ... temp gauge stuck on red ... a mystery to solve.

Just taking a stab in the dark here... but if it were my car my plan of action would be:

-Make sure it's full of coolant
-Do the dashboard diagnostic (there's a series of codes you enter into the dashboard and then a hidden menu appears and one of the choices is a dashboard diagnostic where it makes all the gauges sweep up and down a couple times)\
-Change temp sending unit

(before all of this I'd hook up my trusty allcoms to check for any weird codes)
 

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2002-2005 Range Rover MkIII / L322
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Re: Car won't start ... temp gauge stuck on red ... a mystery to solve.

Just taking a stab in the dark here... but if it were my car my plan of action would be:

-Make sure it's full of coolant
-Do the dashboard diagnostic (there's a series of codes you enter into the dashboard and then a hidden menu appears and one of the choices is a dashboard diagnostic where it makes all the gauges sweep up and down a couple times)\
-Change temp sending unit

(before all of this I'd hook up my trusty allcoms to check for any weird codes)
+1 to that - I think the Engine ECU has a fail safe shutdown, if it senses it is in the red it won't start to protect itself from damage.....that, and also if the temp is that high the fuel map it uses when the engine is warm will make starting almost impossible (like using the choke on the older engines when it is cold!!)

Change the sender to ensure the ECU etc is getting the correct value and start from there!
 

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2002-2005 Range Rover MkIII / L322
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Re: Car won't start ... temp gauge stuck on red ... a mystery to solve.

Before you change the sender, check your earthing straps have good connection.
 

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2002-2005 Range Rover MkIII / L322
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Discussion Starter · #5 ·
Re: Car won't start ... temp gauge stuck on red ... a mystery to solve.

Thanks guys... Local British mechanic gave up after 4 days... Got it towed to Rover Tech in Scottsdale... I hope they can figure it out :( I miss the Rangie
 

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2002-2005 Range Rover MkIII / L322
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Discussion Starter · #6 ·
Re: Car won't start ... temp gauge stuck on red ... a mystery to solve.

Hi guys... Turns out it was a temp sender which shorted out, the one in the thermostat, melted some wires and blew a fuse. The guys at Rover Techs are 150% pros .... If you have a Rove and live in Phoenix go see them.
 
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