Overheating At Speed

[Danni68]

Hi

We have a 2006 grand voyager 2.8crd that will happily sit in traffic in hot weather but once you drive over 60mph the temp goes up quickly and you have to have the heat on and slow down to stop it overheating. It has had a new water pump and timing belt, new coolant tank cap and we have flushed the system a couple of time but still it does it. Any ideas why this happens?? Thanks in advance

[bignev]

Have you checked for crud build up on the radiator affecting airflow?

Or it could be that the rad is clogged up internally, despite the flushing.

[Thun377]

Could be a thermostat problem and you may have to do the mod (video on you tube) its easy to do with the parts being cheap, it sorted all my temperature problems out, am hour well spent

[Willyc]

I had my themostat fail while it was open and it wouldn't warm up maybe yours is closed not allowing enough coolant to get to the radiator.

[brit644]

If therm has a elec connection [later model] then its default sticks halfway closed. Mine heated on long hills.

If you get a therm get the connector too [assuming urs has that], extra 20 odd quid

When shopping give vin, my reg shows different parts..which were wrong [how they were put together in Austria to oblige EU regs] 

[maxcaddy]

I too had serious overheating issues in the past, which I thought I had sorted by fitting a new Thermostat at first, and then a new Radiator.

 

All worked well for 2 years with the needle only going past centre when either really booting it, or on a long hill on a hot summers day, until this week 

 

Currently I'm on holiday in the south west of France, and thought we'd pop over to Spain for a few hours. I've done this before by going to Vielha which is a bit hilly but not too bad. This time I thought I'd go through the Aragnouet/Bielsa Tunnel. However what I didn't know was that the Tunnel entrance is at 5,920ft (according to the wife's Iphone) and by the time the old girl (Voyager not the wife) got up there, the temp gauge was near vertical with bells ringing and the Oil pressure light on  . Fortunately there is restrictive traffic through the Tunnel and waiting 5 mins for a green light gave the engine enough time to cool down. On the Spanish side the road is more forgiving but even still by the time I was back up at the Tunnel entrance on that side, the gauge was also near kissing the limit. Fortunately coming out on the French side was straight into a rainstorm so the rest of the journey was uneventful.

 

The car seems to be running okay despite its 'cooking', with the Temp gauge just as it was before, but time will tell if it makes it back to Blighty.

 

Moral of the story is that on an old Voyager don't put it in a position where it could get excessively hot, and trying to fault find what can be done (other than the obvious fixes) to stop overheating, will be a time consuming and expensive business.