Radiator cooling fans

[scruggs]

Ok, silly question of the day.

There are two cooling fans, are they both supposed to operate at the same time or are they set to cut in separately dependant upon how much cooling is necessary?

At the moment only my off side fan starts working when the temp is around 85 - 90.

[Goaty Bill]

Not that silly a question when you only see one is coming on...

Both mine come on at the same time.
As far as I can remember, always have. 1997 Chim.

[Harrytsg]

Both fans run together (unless the circuit has been modified), most common fault is the connection by the rad.
Modwise kit bring both fans in at low speed, then full speed at higher temps.

[scruggs]

Thanks for the speedy replies.

I have now put the old girl back into hibernation so I will take a look at the connections next time the weather tempts me outside (other than going to work).

Typical TVR, leave it parked for 6 weeks and it gets the grumps.

[Bassfiend]

Yup - both should power up at the same time ...

Bridge the connections at the otter switch to force them on - according to the history of receipts for mine both of the connector blocks between the fans and the main loom have been replaced because they corroded and fell apart.

Phil

[Goaty Bill]

scruggs said:

Typical TVR, leave it parked for 6 weeks and it gets the grumps.

6 weeks!
Only self to blame then

[DHilly]

Both fans should come on together but from memory they are on different fuses. One of my fans was on the same fuse as the horn, check if the horn works.

[Goaty Bill]

DHilly said:

Both fans should come on together but from memory they are on different fuses. One of my fans was on the same fuse as the horn, check if the horn works.

Yes, forgot to mention that.
Mine is the same; now that I am reminded.

[scruggs]

Ok thanks.

Fuses first, then connections second. (and hit it with a damn great hammer third).

[Pink_Floyd]

My 1998 Chim has seperate fuses and relays for each of the fans.

[spend]

Swap the fan connectors over & seeing if the other or same fan runs will enable you to quickly deduce if it is a car side or fan side problem.

99 cars will definitely have separate fuses & relays for each fan circuit, the first fan relay is always activated by grounding at the otter switch, but then it gets fuzzy. Some also have the second fan relay activated by the otter switch, others have it switched by the positive output of the first fan relay so that they come on in a chained fashion (I'm not sure if that was a factory method or a dealer mod - but its been reported quite a few times). They still come on together, it just stages them momentarily to try & overcome the initial load shunt on the electrics?

[scruggs]

spend said:

............the first fan relay is always activated by grounding at the otter switch, but then it gets fuzzy.

That sums up TVR electrics in one statement!

Regards

Scruggs

1999 Chim 500

[nawarne]

Remembering my Chim 450 ('98), I'd be 99.99% sure that it's the connector directly off the fan motor.

As previous, both fans should come on when triggered by otter switch....unless car has the Modwise changes.
Nick