winginit Posted June 17, 2016 Share Posted June 17, 2016 I recently replaced the head gaskets, but the fans where working normally i believe. the only other thing i did was degreese and pressure wash the engine and bay. The fans go on from a cold start and stay on.. what should i look for? the wire is connected to the censer. fans are on so it has power. Any advice what it could be ? Thanks Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted June 17, 2016 Share Posted June 17, 2016 (edited) they(or maybe just one on a 96?)may come on if the a/c is on - make sure it's off and try again? Edited June 17, 2016 by 1 Lucky Texan 1 Quote Link to comment Share on other sites More sharing options...
Cougar Posted June 17, 2016 Share Posted June 17, 2016 If the AC isn't turned on then there may be a problem within the ECU. It controls the fan operation by making a ground connection which turns on the fan relay. If the diagnostic connectors are tied together under the dash that will do it also. Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted June 17, 2016 Share Posted June 17, 2016 (edited) Is it throwing any codes? If the engine coolant temp sensor is bad or not connected the ECU will run the fans as a failsafe since it doesn't know what the temp is. There's two sensors - one for the gauge, the 'coolant temp sensor', which is not the sensor we're looking at/for. The other is the engine coolant temp sensor - that's the one I'm referring to. (Or as already mentioned if the a/c or defrost is on that will do it too). Edited June 17, 2016 by porcupine73 Quote Link to comment Share on other sites More sharing options...
winginit Posted June 17, 2016 Author Share Posted June 17, 2016 oh ok, i think its just the a/c is on. thanks i will check it. Quote Link to comment Share on other sites More sharing options...
winginit Posted June 18, 2016 Author Share Posted June 18, 2016 It was because the engine was being started with the A/C on. Thanks 1 Quote Link to comment Share on other sites More sharing options...
spazomatic Posted June 22, 2016 Share Posted June 22, 2016 Gotta love those easy fixes. The fans will come on with the heat selector on defrost, too. Quote Link to comment Share on other sites More sharing options...
winginit Posted June 22, 2016 Author Share Posted June 22, 2016 Gotta love those easy fixes. The fans will come on with the heat selector on defrost, too. Gotta love those easy fixes. The fans will come on with the heat selector on defrost, too. good to know. thanks Quote Link to comment Share on other sites More sharing options...
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