over heating 406 exec

ronnyp · Post by **ronnyp** » Sat Apr 09, 2011 7:10 pm

I have a 1999 406 Executive 2.0 which keeps over heating. If I'm stood idling the red warning stop light comes on, its ok when I'm running around.I don't seem to be losing any water. Any ideas would be welcome

Gary406 · Post by **Gary406** » Sat Apr 09, 2011 7:11 pm

has the coolant been changed recently ?

what temp is it reaching ?

Post by **steve_earwig** » Sat Apr 09, 2011 7:29 pm

Do the fans work?

ronnyp · Post by **ronnyp** » Sat Apr 09, 2011 7:58 pm

I don't know to be honest as I can't even see them but I do not hear the fan coming on

ronnyp · Post by **ronnyp** » Sat Apr 09, 2011 8:03 pm

I don't know if coolant has been changed as I only got the car a few weeks ago. The temp gauge is showing just under 90 degrees when I'm running around but if I have to do a lot of stop start and using the clutch a lot the gauger goes right over and the red stop light comes on

lozz · Post by **lozz** » Sat Apr 09, 2011 9:42 pm

my guess is,

thermostat fubard,
or faulty header tank cap

also check for an airlock,

ronnyp · Post by **ronnyp** » Sat Apr 09, 2011 10:03 pm

Thanks for info, how do I check for airlock

lozz · Post by **lozz** » Sat Apr 09, 2011 10:07 pm

ronnyp wrote:Thanks for info, how do I check for airlock

theres a bleed screw on the thermostat housing or there abouts,
and theres one on the heater pipes going into direction of bulkhead,

is your heater blowing out hot constant heat ?

also check the header tank asnt been overfilled,
if itsbeen overfilled it couid cause circulation problems

Post by **Doggy** » Sat Apr 09, 2011 10:13 pm

Fans should be working if it's that hot - (he's saying the temperature's just about OK unless it's stationary).

lozz · Post by **lozz** » Sat Apr 09, 2011 10:20 pm

My hdi sits at 90 all day,
ive never seen or heard the fans cut in once,

what temps does other peoples cars get to before fans cut in ?
cheers

Post by **teamster1975** » Sun Apr 10, 2011 11:45 am

The fans should be running at half speed around 90c, you can't really hear them with the engine running but they are on. If one of the fans fail the other will run at full speed all the time. At least on a D8 anyway.

ronnyp · Post by **ronnyp** » Sun Apr 10, 2011 12:03 pm

Thanks for the help, looks like I'll have to wait till I can afford to put it in local garage as I'm disabled and have problems with my hands unless there is some-one local from here who could have a look.

ronnyp · Post by **ronnyp** » Sun Apr 10, 2011 1:44 pm

Been having a look at car 2 things I don't know if relevent.
Top hose is hot temp gauge says about 90 degrees bottom hoses are cold also when I open header tank it is cold. Does all this mean anything

lozz · Post by **lozz** » Sun Apr 10, 2011 1:59 pm

couid be air-lock that,
or Thermostat might be stuck closed

other possibilty if not the above 2 :

Water pump

Gary406 · Post by **Gary406** » Sun Apr 10, 2011 7:15 pm

i would get the thermostat changed 1st mate .

whats your postcode. i live wigan lancashire. if i'm free one day this week could pop down and change the thermostat for you .

406oc.co.uk

over heating 406 exec

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