The Dispatch | Expert | Scudo Hub

DP1012

Member

Registered: 2023-01-30

Posts: 3

High temp warning, stop immediately

Motorway driving today. High temp warning with stop immediately instruction.

Pulled over and stopped few mins. Restart engine temp reading 90C. Continued for while taking it very steady, all ok.
Then as accelerated temp crept up again with same warning.
Keeping speed and revs down temp stays around 90C. (Usually operated around 75c) Go above 40mph them temp creeps back up.

No heating in van.

No water leaks, reservoir full. Oil OK.
Mileage 47k, so shouldn’t be water pump or timing belt. Thinking thermostat stuck closed or temperature sensor feedback to ECU. Although would these prevent heater from working.

Any thoughts please

kenbw2

Administrator

From: Preston

Registered: 2017-11-26

Posts: 1,612

Re: High temp warning, stop immediately

Could also be the dreaded head gasket, although you'd lose coolant with that. Any bubbles if you take the radiator cap off and rev it?

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2000 Citroen Dispatch 1.9TD XUD9 Camper Conversion
1999 Citroen Dispatch 1.9D DW8 Disassembled Camper Conversion
1996 Peugeot 806 1.9TD XUD9 Spare vehicle
1998 Citroen Synergie 1.9TD XUD9 Snapped timing belt

DP1012

Member

Registered: 2023-01-30

Posts: 3

Re: High temp warning, stop immediately

Thankfully head gaskets don’t fail as often as they did. Looks like the thermostat. But how you remove the rear hoses. Help, think needs some special tool.

AlvyLad

Member

Registered: 2021-06-11

Posts: 481

Re: High temp warning, stop immediately

some special tool.

Long nosed pliers

JohnDragonMan

Member

From: Derby, East Midlands, UK

Registered: 2020-06-02

Posts: 456

Website

Re: High temp warning, stop immediately

you may find that it will be the water pump. on the XUD, DW8 and HDi (DW10) the heater matrix pipes bypass the thermostat and exit out of the block in a totally different place to the thermostat. it does not matter if you have the heaters on or off, hot or cold.

i have never come across a impeller and pulley shaft separation on one of the water pumps in these engines before however.
i have seen this happen on the old FIAT FIRE engines as some water pumps had plastic impellers (Nasty!) and some had cast steel and some stainless pressed sheet (which are my personal favourite)

i am sorry to deliver the bad news.
one way to test this theory is to start the engine with the coolant tank open and look for the auto bleed flow to start flowing coolant through the tank. if you have no flow, it can only be a pump failure or a main blocked pipe (the heater matrix circuit also bypasses the main radiator too so the auto bleed system will still flow)

also one thing to remember that the timing belt is not only mileage dependent, it is also more importantly time dependent. if the van is over 8 years old that timing belt is well past its life expectancy. you may be lucky in that the water pump gave out first before the belt did. distance means nothing to a timing belt. i have changed belts after just 3 years of use yet the vehicle has done 300k miles in that time and the belt still looked as good as the day i put it on. it was an Iveco Daily van with the Fiat 3.0L MultiJet engine. nice engine, tiny oil filter though. with the right belt dressing, a timing belt can last hundreds of thousands of miles and still look good when changed.

heh i still do them every 6 years though >_<

Last edited by JohnDragonMan (2023-02-01 22:20:02)

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- JohnDragonMan
Notice: I have the tendency to void warranties, blow fuses, cause fires, and other fun stuff.
Words of wisdom: Internally rust proof the sills and subframe! both skins!!. There's always user serviceable parts inside. "Oh that shouldn't have happened".
My 2005 Dispatch Camper Project

DP1012

Member

Registered: 2023-01-30

Posts: 3

Re: High temp warning, stop immediately

Fearing could be water pump impeller, van is only 4 yrs old.