Thread: 3.9 V8 ran hot yesterday....what now?

Originally Posted by PhilipA

Yes it will be a serpentine.

LR made lots of changes over the life of the 3.9. in 89-91 they had vbelts, in 92 they had a combination with a serpentine type running the alternator but Vs elsewhere and I think 93 went to serpentine.

I have a big gap in knowledge of this between 91 and 2002 TD5.LOL

BUT it will still probably have an overtemperature switch somewhere which you can bridge with a manual switch.

Remember to earth the fan when testing if you separate a connector.
Regards Philip A

I believe the over temp switch is still on the thermostat housing just like on the earlier models. I've come across quite a few stuffed ones, both permanently on and off. Bridging the wires is the first step for diagnosis.

I believe the over temp switch is still on the thermostat housing just like on the earlier models. I've come across quite a few stuffed ones, both permanently on and off. Bridging the wires is the first step for diagnosis.

P/N PRC3505, has to 2 x 6mm terminals.

PRC3505 - Switch Temp Sensor Yellow 90/110 2.5DT and V8. Discovery 300TDI and V8. Range Rover Classic V8

Done some simple poking around with a test light. Turned A.c on, probed the wires at the condenser fans and the light came on but no fans. My best guess is the fans are cactus, powers getting to them. Anyone ever upgraded the fans before?

Done some simple poking around with a test light. Turned A.c on, probed the wires at the condenser fans and the light came on but no fans. My best guess is the fans are cactus, powers getting to them. Anyone ever upgraded the fans before?

Hmm, I think it could be possible for a test light to have 12volts but no current.
I would still run a hot wire from the battery to the fans, rather than through the system.
That way you are sure about whether they work or not.

I have replaced fans often. I usually use just Supercheap or Ebay or whatever fans but order ones with a similar wattage or current draw. I think they are 12 amp but not sure. Try to get waterproof ones. make up mounts to suit.
Sometimes you can get a larger fan to fit by making mounts and diddling about a bit.

Regards Philip A

Replaced a few dead RRC fans in my time. Fit whatever fits.

Condensor fans on my old rrc had a ford sticker on them, not sure what ford they came from tho.

Condenser fans are defiantly cactus, tried running power to them and nothing. Ran multimeter over the wires, read 12v on and 0v off. Don't have any fans laying around that will fit bummer. Would using the a.c. without the fans kill the condenser? I'll get some new ones later in the week but with the baby in the car i may need the a.c. till then
Cheers Jim

Originally Posted by LRJim

Condenser fans are defiantly cactus, tried running power to them and nothing. Ran multimeter over the wires, read 12v on and 0v off. Don't have any fans laying around that will fit bummer. Would using the a.c. without the fans kill the condenser? I'll get some new ones later in the week but with the baby in the car i may need the a.c. till then
Cheers Jim

The air cond may trip out at its high pressure switch setting or even burst a hose if it's too unhappy, although that's not likely as you shouldn't be into the 40 degree days yet. The main engine fan should assist air flow across the condenser unless you're idling for a long time.