Dual fans in 96 LT1 not turning on
07-28-2010, 12:53 AM
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Dual fans in 96 LT1 not turning on Hey guys,
My dual fans are not turning on automatically -- this is for a conversion application, an LT1 (1996 impala ss in a Jaguar XJ6) -- when i popped out the relays from the fuse block and ran a jumper wire straight from the battery to the fuse block connector (a blue wire for primary fan, and brown wire for secondary fan), the fans engaged.
SO... the fans work, but are not turning on automatically. The fuses all look good (maxi and two 10A fuses) -- i tried a new relay for the primary/secondary fan but got nothing.
don't know what else to do... any ideas? any way to force the fans to come on at all times? i've heard removing the sensor at the water pump forces the fans on, but it didn't do the trick... any help would be fantastic!
thanks!
tyler
My dual fans are not turning on automatically -- this is for a conversion application, an LT1 (1996 impala ss in a Jaguar XJ6) -- when i popped out the relays from the fuse block and ran a jumper wire straight from the battery to the fuse block connector (a blue wire for primary fan, and brown wire for secondary fan), the fans engaged.
SO... the fans work, but are not turning on automatically. The fuses all look good (maxi and two 10A fuses) -- i tried a new relay for the primary/secondary fan but got nothing.
don't know what else to do... any ideas? any way to force the fans to come on at all times? i've heard removing the sensor at the water pump forces the fans on, but it didn't do the trick... any help would be fantastic!
thanks!
tyler
07-28-2010, 08:57 AM
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Yeah let me know what you find out, mine has done this for years now! Tried swapping the sensor in the water pump and the head, didn't help. I always have a jumper wire to jump the damn relay, Sucks! Thought about hard wiring it to a toggle! I hate chasing wires down....
07-28-2010, 12:40 PM
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relay wires in tracking the relay wires from the A10/A11 (PCM connector pin outs), is there a way to test continuity from the connector all the way to the fuse box? would the connectors that control the relays in the fuse box be hot at ignition ON? or are they only hot when the engine is actually running?
if there is continuity for the wires, could it be a PCM issue? it would be odd if the cooling circuit in the PCM is toast, and the rest of the engine functions properly, wouldn't it?
thanks!
tyler
if there is continuity for the wires, could it be a PCM issue? it would be odd if the cooling circuit in the PCM is toast, and the rest of the engine functions properly, wouldn't it?
thanks!
tyler
07-28-2010, 02:31 PM
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i'd prefer it to be automatic -- less crap to clutter up the cab. is there a temperature sensitive switch i could add? since the sensor in the pump is what tells the PCM to turn on the fans, perhaps there is a temperature sensitive switch which can be directly routed to the relay control wires?
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07-28-2010, 04:24 PM
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07-28-2010, 04:29 PM
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Possible the temp sensor in the water pump (where the pcm gets its reading from i thought, dont quote me on it thought) is buggered and reading improperly not allowing the fans to turn on at all?
07-28-2010, 10:27 PM
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when i grounded the pins in the red connector to the pcm, (A10/A11) the fans turned on. means the relays/control wires are ok in that realm... what else could it be? the sensor is new (as of last year) so shouldn't it be ok? plus it is giving me accurate readings, verified by my scanning software (it got up to 240, and the fans never came on)
