Question about 1999 Chevrolet Malibu
New thermostat, new hoses, and new ECT
Unplug the coolant sensor and the fan should come on when u unplug it
the ecm grounds the fan relay so the relay gets power all the the time
13 year old malibu most likely the fan motor is bad put direct power to it.
Posted on Feb 25, 2012
Testimonial: "unplugged ect and fans kicked on. so i assume the fan motor is fine?"
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Posted on Jan 02, 2017
SOURCE: Cooling fan wont work
The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.
Posted on Sep 27, 2008
SOURCE: PO481 code Chevy IMPALA 2003
Looked it up in Chilton's, confirmed in http://www.obd-codes.com/trouble_codes/
P0481 Cooling Fan 2 Control Circuit Malfunction
Each fan will throw a different code. See 3 fans listed for your model. Here's a link for the wiring schematic: http://www.chiltonlibrary.com/content/images/WD/GM/014/WD_GM_014788.pdf
Best of luck.
Posted on May 23, 2009
SOURCE: engine cooling fan not coming on
It may be the fan itself. Try to find the plug going to the fan, it should be close to the fan and might plug diresctly into the relay. Use two jumper wires straight from the Bat one from the pos+ side and one from the neg- side and plug them into the two holes in the connector the fan should start WATCH YOUR FINGERS. If it starts its elec prob before the fan if not its the fan.
Posted on Jun 12, 2009
The PCM controls these fans via certain sensor inputs, ( CTS ) and switches ( A/C compressor for instance ). When relays are removed, both relays sockets should show 12v constant ( battery voltage on "switch side" ). When the key is rolled on, there should be 12v appear in two more places, ("Coil side" ) the relays are then operated by a ground signal from the PCM. ( Powertrain Control Module ) You need a scan-tool to check for fan request, by the PCM. A/C compressor request, etc. If you have any DTC's then repairing them may well fix your problem, otherwise, you may have a faulty PCM.
Posted on Oct 24, 2009
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