Thermo fan one on constantly

[gkronberg]

Hi all
Thermo fan one is on constantly.

Assume it’s a sensor issue , or is it something else

[8ball_Rob]

The TVR Speed-6 ECU Diagnostics Software User Manual (see the downloads page on MyTuscan.co.uk) has the following to say about the cooling fans and sensor faults (see p.4):

TVR Speed-6 ECU Diagnostics Software User Manual said:

WATER TEMP
Water temperature is measured by the sensor located in the cylinder head. If the ECU detects a fault with this reading it will substitute a value of 95°C. The engine cooling fans are controlled by this temperature reading, and are turned on at 92°C, off at 88°C. Therefore under fault conditions the cooling fans will be turned on.

From your post it sounds as though you only have one fan that's stuck on, so based on the above I'd have thought that a sensor fault is unlikely since otherwise you would expect both fans to be permanently on. Have you checked the relays for both fans? If not, and if the second fan seems to be operating correctly (i.e. kicking in at higher temperatures), then could you try swapping the two relays around to see if the first fan then switches on/off correctly? If swapping the relays causes the fault to move to the other fan, then I'd say you've found the culprit.

NB. The MyTuscan website also helpfully has a copy of the fuseboard layout:

[gkronberg]

Magic , thanks

1. 2 does kick in . So I’ll hunt the relay as a possible issue .

If you don’t hear from me , it’s all resolved ..

Ta

[TravelsVeryRapid]

I recently had that problem and it was a relay. You can get a replacement from TVR parts.

[KenInOntario]

I have exactly the same problem. Tried swapping the relays around and the fan still comes on, any ideas?

[KenInOntario]

I found my issue. Loose connector

[Technoholic]

Loose connector where? I have the same issue but think it’s the trinary switch at fault

[OlderandWiser]

The right hand (drivers side) fan runs on my car, but not the left. Should they both kick in at the same temp, or one first, then the second if temperature continues to rise?

[Basil Brush]

The first kicks in at 92 degrees then the second at 94.