93 Grand Prix Posted January 7, 2003 Report Share Posted January 7, 2003 I think I know why my cooling fans won't come on. After repalceing my temp sensor guage 2 times, I came to the conclusion that the computer is not telling them to come on. Also, I noticed that the primary fan comes on when I press the a/c switch. What do you guys think? Quote Link to comment Share on other sites More sharing options...
toastemcutlass Posted January 7, 2003 Report Share Posted January 7, 2003 are you sure the primary fan is going on and not the secondary when the a/c is turned on. primary is the one that is to the left when your sitting in the car. and the secondary is triped bye the a/c being turned on and also after a certain temp. find the relay for the fan and test it to see if it works. if you changed the sensor the relay is probably the punk messing with you. good luck Quote Link to comment Share on other sites More sharing options...
93 Grand Prix Posted January 7, 2003 Author Report Share Posted January 7, 2003 I replaced both relays also. Replaced w/ 2 GM Pontiac dealership relays!!! $13 bucks a piece! Quote Link to comment Share on other sites More sharing options...
toastemcutlass Posted January 7, 2003 Report Share Posted January 7, 2003 you didn't say the side fan that goes on. unplug the fan at the harness and put 12volts to it and see if the fan at least works. Quote Link to comment Share on other sites More sharing options...
93 Grand Prix Posted January 8, 2003 Author Report Share Posted January 8, 2003 BOTH fans work. Read past post. Quote Link to comment Share on other sites More sharing options...
Redfox340 Posted January 8, 2003 Report Share Posted January 8, 2003 93GrandPrix, I've got the Helm manual in front of me, with a long dignostic flow chart... I can take photos and send them to you if you like (about 4 pages)... You did have another topic / post on this didn't you? I figure you'd want to fix this problem right and least time possible; and since I don't know the whole story, figured you would know best on your car. Get back to me, if you would like the schematics. - RedFox340 Quote Link to comment Share on other sites More sharing options...
93 Grand Prix Posted January 8, 2003 Author Report Share Posted January 8, 2003 Yes, please send then to me! I will be forever greatful. Thanks you much. Quote Link to comment Share on other sites More sharing options...
hambone Posted January 8, 2003 Report Share Posted January 8, 2003 i bought one of those gm code readers ( it uses the engine light on the dash to blink out the computer codes ). i noticed that with it plugged in both fans come on full speed ! i have had problems with temps since the a/c went and it 'seems' to be related to fans ( as above they replaced sensor twice and relays but it still didn't seem to work... ) i did notice that it if reached in and spun the fan blades by hand they would start spinning ( maybe a bearing problem ?... ) soooo, until i get the problem identified if the temp starts going over half-way i pull over and plug in the code reader to crank the fans.... it says in the manual for the code reader not to drive the car with unit plugged in... is this true ? what could happen ? Quote Link to comment Share on other sites More sharing options...
Paul GTP Posted January 8, 2003 Report Share Posted January 8, 2003 Men, Those Code reades are waste of money, THey dont do absolutely nothing, Exept shorting terminals, You can achive the same thing by using a paper clip. Quote Link to comment Share on other sites More sharing options...
msvestka Posted January 8, 2003 Report Share Posted January 8, 2003 93 Grand Prix- Short pins A & B of the ALDL together with a paper clip. If both fans come on, all the wiring and components from the ECM to the fans is ok. The fan will not come on until 108 C (227 F). Quote Link to comment Share on other sites More sharing options...
STR Posted January 8, 2003 Report Share Posted January 8, 2003 this has come up before, i wasn't going to say something, but before someone rips their car apart................. ...there is nothing wrong with your fans! The prim.fan is the working fan. Car gets hot, prim.fan will turn on. A/C turns on, prim.fan will turn on. But, you start to get a little too hot uder the hood, sec.fan will turn on. The secondary fan is your "overheat" fan. You don't want to see it on! Hope this clears things up Quote Link to comment Share on other sites More sharing options...
cutlassdude96 Posted January 9, 2003 Report Share Posted January 9, 2003 they also come on when the AC is on max and fan on high Quote Link to comment Share on other sites More sharing options...
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