reatta91 Posted February 16, 2007 Share Posted February 16, 2007 I was wondering if anyone knows how to lower the temp at which the radiator fan will come on ? I hope there is an easy way to do it on my 1991 Reatta. Link to comment Share on other sites More sharing options...
Guest imported_dantm4 Posted February 16, 2007 Share Posted February 16, 2007 I think you need to have the computer chip reprogrammed. There are hardware applications out there, but the chip is probably the easiest. Try GMtuners.com. -Dan90' Black/Tan coupe Link to comment Share on other sites More sharing options...
Guest wally888 Posted February 17, 2007 Share Posted February 17, 2007 Reprograming is the answer. 185* thermostat helps. Link to comment Share on other sites More sharing options...
Guest F14CRAZY Posted February 17, 2007 Share Posted February 17, 2007 Yup, you'd first want to go with a 180 degree thermostat, and that itself makes a heck of a difference. If you'd still like to have your fans programmed after replacing the thermostat, then yes, Ryan of GMtuners.com can fix you up Link to comment Share on other sites More sharing options...
Blue90 Posted February 17, 2007 Share Posted February 17, 2007 I believe we're talking about reprogramming the ECM (The one you have to stand on your head to get out) here? What are the recommended reprogrammed temperatures for the high and low fans to come on with a 180F thermostat.Thanks,S. <img src="http://forums.aaca.org/images/graemlins/tongue.gif" alt="" /> Link to comment Share on other sites More sharing options...
Guest TommyH Posted February 17, 2007 Share Posted February 17, 2007 is it a bad thing if i cant get one of the fans to come on in manual override?(1989) i think it is the one closest to the engine. Link to comment Share on other sites More sharing options...
padgett Posted February 17, 2007 Share Posted February 17, 2007 a) manual override only works if key is on but engine is off. I have a 180F Stant Superstat. Fans are set for LO to come on at 185 and off at 182. HI comes on at 189 and off at 186. Usually runs 179-181 when driving but may turn fans on at a stoplight. Haven't seem anything over 190F for years and I live in central Florida. Link to comment Share on other sites More sharing options...
Blue90 Posted February 20, 2007 Share Posted February 20, 2007 Padgett, Thanks for posting the reprogrammed fan on/off temperatures.S. Link to comment Share on other sites More sharing options...
DAVES89 Posted February 22, 2007 Share Posted February 22, 2007 Now you guys have got me paranoid. I drove my car to see what mine would do. Water temp got as high as 206,low of 193, only I had mine set at economy. High today of 50 degrees. When I got home fan was not running. When I switched it on a/c, then fan ran. However I only have ONE FAN on my '89. Is that correct? Also my volt gauge read as high as 15.4 volts with a low of 13.8 volts. Is this range also normal? Thanks for easing my now troubled soul. Link to comment Share on other sites More sharing options...
Guest TommyH Posted February 22, 2007 Share Posted February 22, 2007 you have two fans at the radiator. i cant get the one closest to the engine to come on in override. but it hasnt been warm in the 3 feet of snow we got. Link to comment Share on other sites More sharing options...
DAVES89 Posted February 22, 2007 Share Posted February 22, 2007 Sorry I have 1 fan. The fan shroud measures 20" wide and 18" high. Am I the only one with this setup? Link to comment Share on other sites More sharing options...
Guest alex_houston Posted February 22, 2007 Share Posted February 22, 2007 Seems like we are all having problems getting the fans to come on in over-ride. Link to comment Share on other sites More sharing options...
DAVES89 Posted February 22, 2007 Share Posted February 22, 2007 I also, by the way, recently replaced my thermostat with either a 185 or 195 super stat thermostat. Is that o.k,? OOPS! I feel like a dummy. Read my service manual and saw that there are 2 fans,one on each side of radiator. Still wonder why everyone talks about a 180 degree thermostat when the service manual calls for a 195. Also any answer on the 13.9 to 15.2 voltage swing on my volt gauge? Link to comment Share on other sites More sharing options...
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