Engine Cooling problem
1999 Nissan Quest 6 cyl Two Wheel Drive Automatic 100, 00 miles
I have Nissan Quest mini van 1999, 100: 000 miles.
I have problem with Radiator fan did not turn on low speed when engine warm. The fan turn on only on high speed, or A/c or heat on.
1) I tested the Fan by Jumped the hot wire directed from battery to the fan, It worked.
2) I tested all three relay. Apply power to each invidual, all three clicked
03) I checked power of three terminal, all they have power, when inigtion key was on position.
The problem is there is 7.5 am RAD not power at all. Engine off, or run, the fuse checked ok. There is no power, even engine ran,
The raw of Fan relay A is low speed, B is high 1, C is high 2,
4) I switched relay by one at the time, both B and C high speed worked.
The problem is A relay position not work at all. Runing engine to hot. But relay did not click to close curcuit, so the low speed can turn.
I moved same relay to the other place B and C high speed fan, it worked high speed fan.
The theomastart worked Ok, Coolant sensor worked, It send signal to turn high speed fan on.
Please, Tell me How do you think? Thank yoiu
Monday, May 25th, 2009 AT 8:40 AM