Volvo 2003 temperature

[AntarcticPilot]

Now I wonder where the lead from thermostat goes to. Will check the instruments in the cockpit, to be honest been busy updating the saloon to properly look.

It goes through the wiring loom to the engine panel, where it operates a warning light in the event of overheating. I've never seen it lit except on turning the panel on.

 

[[176172]]

Lead from the thermostat ?
The thermostat is not an electrical device, nor is there any electrical connection to it.

Perhaps you are looking at the connection to the high temperature warning light/alarm sensor. Check the colour of the wire with the wiring diagram in the owners manual and you should be able to identify it.

Sorry I did mean temperature sensor, I will attach photographs of the connection to it, also of a connection box to the left of it under which the connection runs aft though it is not connected to it. Any ideas what it is. It sits on top of a box to which a tube is connected to it, as you can see the PO held it there with a piece of cord. All these challenges will of course be rectified prior to going to sea which is a few months in the future.
I have always previously had Perkins engines, this is my first VP so please excuse what are seemingly basic questions well know to regular VP users.

 

[[176172]]

It goes through the wiring loom to the engine panel, where it operates a warning light in the event of overheating. I've never seen it lit except on turning the panel on.

Yes the panel does have a warning light I will check for it’s operation, I should imagine removing it when running will have the same effect as an overheat.

 

[duncan99210]

The box you’ve photoed looks like the early version of the connection/relay box in the later Volvo engine. The clear plastic affair on the top is the fuse for the power supply to the panel; it’s got a a number of fuses so you can quickly switch to a fresh fuse by moving the connection nearest to the camera to the next good fuse. The box itself will have a relay inside for the starter motor.
There‘ll be a multi way cable running from the box to the control panel, possibly by way of a plug and socket. (Just looked at the photo again: the cable exits from the far end via a plug and socket.)
The single connection into the engine block is probably the temperature sensor.

 

[Spirit (of Glenans)]

I do not have an owners manual, but will depend entirely on those who have and are owners of longer standing than myself.
The temperature gauge starts at 10 and ends at 60.
The engine was running a little higher than tickover but not much more and climbed when I picked up the revs, though only to about 50%.
My concern that as it showed nearly 60 the clocks maximum whether if it was therefore overheating, which as explained when inspecting the engine there was no obvious signs of, and all appeared normal. Having in the past witnessed very overheated engines in various vehicles and boats it was quite a relief to find nothing wrong, from what I thought the gauge was telling me.
It doesn’t read 75, 60 is the max on it.

You might find this link useful:
Manuals & handbooks | Volvo Penta

 

[AntarcticPilot]

You might find this link useful:
Manuals & handbooks | Volvo Penta

There's a very clear wiring diagram in one or other of the User manual or the Workshop manual, I forget which. However, note that there are two possibilities - it looks from your photo as if you've got the simpler version (like mine). But the wiring diagram is invaluable, as some of the connections are not intuitive.

 

[[176172]]

The box you’ve photoed looks like the early version of the connection/relay box in the later Volvo engine. The clear plastic affair on the top is the fuse for the power supply to the panel; it’s got a a number of fuses so you can quickly switch to a fresh fuse by moving the connection nearest to the camera to the next good fuse. The box itself will have a relay inside for the starter motor.
There‘ll be a multi way cable running from the box to the control panel, possibly by way of a plug and socket. (Just looked at the photo again: the cable exits from the far end via a plug and socket.)
The single connection into the engine block is probably the temperature sensor.

Thank you for that explanation. As you pointed out there does appear to be a relay underneath the white plastic cover which has other vacant connectors awaiting use following a fuse failure.
The multi-way exit you point out, must be what is currently held in place by the cord which I shall investigate further.

 

[VicS]

Yes the panel does have a warning light I will check for it’s operation, I should imagine removing it when running will have the same effect as an overheat.

The over heat warning sensor is a switch which is normally open. It closes, to activate the light/ alarm , if the engine overheats . To test the warning light operation short the lead on the sensor to the bock ( power to panel/ ignition must be on of course).
Disconnecting the lead from the sensor will merely render it inoperative. The only way to test the sensor is to heat it in very hot water and check with a multimeter on a low ohms or continuity range ( or with a bolba nd battery) that it closes,

There's a very clear wiring diagram in one or other of the User manual or the Workshop manual, I forget which. However, note that there are two possibilities - it looks from your photo as if you've got the simpler version (like mine). But the wiring diagram is invaluable, as some of the connections are not intuitive.

The wiring diagrams are in both the manuals.

I gave the link for the owners manuals in #4 ( and Spirit of Glenans has repeated it in #25)

The workshop manual can be found at VOLVO PENTA 2001 WORKSHOP MANUAL Pdf Download.