Seeking some advice.......

[00slk]

On the temperature gauge reading on my 04 e Class e320cdi. It seems to me to be reading extremely low as you can see in the photo. Heater is okay but not as hot as the other Mercedes I have and had.
Also my fuel economy is very poor for a diesel
It starts and runs very nicely, no smoke from the engine at any throttle position, the fuel gauge segment drop in accordance to the amount of fuel being used
My 496bhp SL55 returns better mpg
Could the 2 be connected?
Many thank in advance

 

[Blobcat]

No picture...

 

[ajlsl600]

Statt stuck open. Will lower mpg .reduce heating .

 

[Wighty]

Should be at about 85-90 ish looking at mine

 

[00slk]

Picture has disappeared into hyba space

 

[Blobcat]

Picture has disappeared into hyba space

View attachment 63302

Stat fubared

 

[00slk]

Statt stuck open. Will lower mpg .reduce heating .

Thanks ajlsl600 will start with a new one

 

[00slk]

New thermostat ordered

 

[grahamcol]

You'll find the economy vastly better after fitting a new stat.That's what l found with my CLK220 CDI.

 

[00slk]

Thanks Graham sure hope so with this one
Last night the gauge didn't register passed 40 degrees
Going to take the SLK today to work

 

[Flyinspanner]

If the stat is stuck open,.... yes slow to warm, and worse mpg, however, it will eventually warm up, and your gauge should show that.
It could be a failed temp sensor as well as the stat.
Maybe an airlock in the system? How’s the fluid level? Have you had to add any recently?

 

[EmilysDad]

If the stat is stuck open,.... yes slow to warm, and worse mpg, however, it will eventually warm up, and your gauge should show that.
It could be a failed temp sensor as well as the stat.
Maybe an airlock in the system? How’s the fluid level? Have you had to add any recently?

Not while there's an air flow across the radiator it won't. The temp will gradually rise if the car is left ticking over.
To test for a stat that's failed open ... start the car from cold and keep an eye on the temp of the top rad hose. If the stat is stuck open the top hose will gradually get warm as the engine gets warm. The top hose should remain cold & then suddenly get hot with a properly working stat.

 

[00slk]

Thanks guys, it won't reach over 40 degrees on a run and very slow to got up the scale, though it will eventually get too 60 degrees after a hour of town stop start driving.
Coming home at night and 2 degrees the gauge just got to one notch about the bottom scale.
When I took the photo the other night it sat idling for 10 minutes so raised slightly.
I picked up the new stat and will fit it tomorrow morning and see how it goes.

 

[V6Matty]

FYI the 211 had electric cabin heaters which is why it still felt warm inside, really nice feature on cold days where it would be warming up after just a couple of minutes

 

[00slk]

Success, well hope so


My youngest lad had to use my car today so he'll be the tester of great things In the mean time it meant I had to take my 55 to work this afternoon The reason why we all need to own 10 cars

 

[Wighty]

Success, well hope so
View attachment 63330
View attachment 63329
My youngest lad had to use my car today so he'll be the tester of great things In the mean time it meant I had to take my 55 to work this afternoon The reason why we all need to own 10 cars

That’s the baby

 

[00slk]

FYI the 211 had electric cabin heaters which is why it still felt warm inside, really nice feature on cold days where it would be warming up after just a couple of minutes

My one doesn't have that option sadly Matty

 

[Blobcat]

Success, well hope so
View attachment 63330
View attachment 63329
My youngest lad had to use my car today so he'll be the tester of great things In the mean time it meant I had to take my 55 to work this afternoon The reason why we all need to own 10 cars

How was the tank baffle?

 

[00slk]

How was the tank baffle?

Touch wood, haven't had any issues with the 55's tank baffles mind you I ain't home yet

 

[V6Matty]

My one doesn't have that option sadly Matty

I think it was standard on the avantguard, it’s not a pre heater as such but an electric boost for the first 10 minutes until the engine started to get to temp