Sign in to follow this  
Followers 0
grahamjf

Running cold

8 posts in this topic

Hi all

My car runs cold very seldom the car gets above 50 degrees unless it's getting booted up a hill then drops back to the 50 again.
Changed the thermostat to a 88 degrees still the same running cold.
Plugged in live data temperature gauge reads correct when I drive watching the data screen I can see the temperature rising going up a hill and dropping back going down a hill.
When i do a diagnostic check on it comes up with engine coolant temperature sensor changed that for a genuine audi one cleared the codes still comes up with that fault
Took the thermostat out, put it in a jar of boiling water at 88 degrees, I can then see it opening. Poured in some cold water it closes.
No mental black smoke, the heaters good but not mental hot, some times I get 53mpg some times as low as 40mpg all under the same driving conditions.

Top and bottom radiator hoses dont get too hot and the hoses going to the internal heater are not hot (just warm)

Any ideas on this one? I'm totally lost

2005 Audi A4 B7 2.0 tdi

Share this post


Link to post
Share on other sites

Hi!

Does the top of the engine feel hot after it's been driven?  As in really hot?

I am wondering if the water pump impeller is knackered.

It is then you will not be getting the correct flow of coolant around the engine, so some parts will stay hot, some cool.....  I think.

 

Share this post


Link to post
Share on other sites

took the car for a 30 minute run temperature still at 50 (cold) Heater warm.
Got back home left the car running took the hose of at the heater matrix with the pin hole. Put the heaters to hottest setting and full speed
Ran the car for ten minutes no sign of any water coming out of that hole or bubbles, Took the expansion tank of and lifted it as high as it would go for 5 minutes still no water.
Switched the car off took the cap off the expansion bottle and after about two seconds there was a good flow of water came out.

Is my water pump gone?

Top of the engine is not hot, you can put your hand on it

Any help on this i'm lost

Share this post


Link to post
Share on other sites
On 23/11/2016 at 11:12 AM, grahamjf said:

took the car for a 30 minute run temperature still at 50 (cold) Heater warm.
Got back home left the car running took the hose of at the heater matrix with the pin hole. Put the heaters to hottest setting and full speed
Ran the car for ten minutes no sign of any water coming out of that hole or bubbles, Took the expansion tank of and lifted it as high as it would go for 5 minutes still no water.
Switched the car off took the cap off the expansion bottle and after about two seconds there was a good flow of water came out.

Is my water pump gone?

Top of the engine is not hot, you can put your hand on it

Any help on this i'm lost

WTF?

Really wierd! 

Do all the fluid levels look OK when it's cold?

And when 'warm'?  How's the exhaust looking in this weather and also how is the oil level?  Does that go down quickly?  Any gungey mayo in the oil cap?

 

Share this post


Link to post
Share on other sites

Thanks for the reply

Doesent matter if its hot or cold the coolant level is still at the same level. Sits on max

Exhaust is fine no black smoke, oil level need's about a couple of egg cups full's about every 1500 miles which is as far as I'm lead to believe is normal for an audi engine.

No gunk on the oil filler cap

 

Just passed its mot and the exhaust emissions were well below the requirements, Even the examiner said it's very clean.

Share this post


Link to post
Share on other sites

Must be a duff gauge.  It miust be!!!!?

Or your engine has 2 temp sensors.  Faulty one is sending to the gauge and the other one is used for EM stuff and is reading correclty? 

 

Serious head scratching!!!!

 

Share this post


Link to post
Share on other sites

Thanks for the reply

 

head scratching indeed

Edited by grahamjf

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0