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Nathan B
Nathan B, Nvq3 motor mechanic
Category: Vauxhall
Satisfied Customers: 4
Experience:  Over 20 years experience including running my own garage working on a wide range of vehicles.
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I recently purchased a vectra 3.0 v6 diesel estate 2008 . on

Customer Question

I recently purchased a vectra 3.0 v6 diesel estate 2008 . on its first drive down the motor way the temp shot into the red, the car was pulled up immediately.
a weak thermostat was diagnosed and replaced.
but there is still an overheating problem.
at normal round town speeds of 30/50 the gauge holds steady at about 86. at tick over at junctions the temp increases to 90. but as soon as you pull away the temp starts to drop back to 86. at higher speeds 80ish the temp starts to rise up to 87/88( i have not taken it higher to see if it rises further).
we replaced the water pump but there was not much wrong with it and no change.
there is no water loss and the system has reasonable pressure.
if the call is allowed to tick over at stand still and allowed to rise to 90, if the engine revs are increased to 1500rpm at stand still the temp will drop back to 86. all the hoses appear to be in good condition and work properly.
completely stumped any ideas or pointers would be appreciated
Submitted: 3 years ago.
Category: Vauxhall
Expert:  Mike replied 3 years ago.
Hello and Welcome -

My name is MIKE - Im happy to help / advise..

Just before we progress - have you had any signs of true overheating - water being pushed out etc -- ? anything like that ?

Have you had the actual temp of the engine checked with a proper meter?

Rgds, MIKE........................................
Customer: replied 3 years ago.

Hi Mike


sorry for the delay in responding to your reply.


The first incident on the motorway, the car was pushing water out past the pressure cap.


Since then no but i have not pushed it to do so.


and no i have not checked the actual temp of the engine. mainly because i do not have the equipment.


I resembled the left hand side of the engine this evening and also checked the radiator al seems good. i noticed there is a small electric pump to the right lower side of the radiator which is plumbed into the

cooling system, i presume this activates after the engine is stopped to keep some flow around the block. if this were faulty could it obstruct the flow.

Expert:  Mike replied 3 years ago.

Let me research this for you a little more and I will get back with you as quickly as possible. Thanks for your patience.