adams2003 Posted March 28, 2004 Report Share Posted March 28, 2004 Well today me and Cody (56chevywagon) installed a 3.1 and a 160 hypertech thermostat. The pulley works great and the truck pulls much harder now. The 160 seemed to be working but then the guage started going wacko. First when we installed the stat, and started the truck the guage quickly shot up to over 220 degrees after a couple minutes of idling. Then I reved it up a couple of times and the temp went down to about 180. It stayed there for about ten minutes on a test drive and then all of the sudden it shot down to the bottom line (160) all of the sudden and stayed there. I shut the truck off and then turned it on again and it went to 185 degrees and then imediately went back to 160. On the way home it stayed at 160 and never moved. I now its a 160 degree thermostat but I thought I recalled that someone one else on here had done theres and it acually runs at about 180-185 and not 160? Any ideas about whats going on? Link to comment Share on other sites More sharing options...
deezel Posted March 28, 2004 Report Share Posted March 28, 2004 I'd guess the initial high temperature spike was due to air bubbles in the coolant. That should go away. The dash temp gauge is not very accurate. Mine reads around 160 on the factory gauge when its actually 180-185 (according to EFILive). When I sit in traffic and the engine heats up, it gets up to about 190 and the dash gauge will jump up to 195. So, I'd say your probably seeing normal operation of the dash gauge. If it goes over 210 and stays there, then you should be concerned. Link to comment Share on other sites More sharing options...
BenKey Posted March 28, 2004 Report Share Posted March 28, 2004 If you want to know the accuracy of the gauge, then you'll need autotap or EFIlive. That thing I've been telling you, you need. The sending unit for that gauge is just behind the alternator, sticking in the side of the head, just above the spark plug wire. Did you guys go through that initial procedure of getting the air out? Link to comment Share on other sites More sharing options...
SSminneapolis Posted March 28, 2004 Report Share Posted March 28, 2004 i had a problem with my temp gauge some time ago. it would just sit on the bottom line and not do anything. after running the truck for a while i would shut it down. wait a few minutes and start back up - the temp would register but as soon as i shifted out of park it would drop to bottom line again. i went into the dealer to see what they could do. i had to set up an appointment. i guess that was enough for my baby cause she has been fine since, just started working out of the blue. only problem with the gauge cluster now is the light on the side where the trans temp is isn't working. Link to comment Share on other sites More sharing options...
BenKey Posted March 28, 2004 Report Share Posted March 28, 2004 SSMinn - Should be replaceable bulbs inside the cluster. Had to do it to my S-10 that I had. Link to comment Share on other sites More sharing options...
adams2003 Posted March 28, 2004 Author Report Share Posted March 28, 2004 Did you guys go through that initial procedure of getting the air out? No Ben we didn't do that. It was getting late and it was almost dark so we forgot to I guess. Link to comment Share on other sites More sharing options...
adams2003 Posted March 29, 2004 Author Report Share Posted March 29, 2004 Drove it again today for about 15 minutes and the temp guage stayed right at 180 degrees the whole time. I think its working fine now. Link to comment Share on other sites More sharing options...
Blue-SS Posted March 31, 2004 Report Share Posted March 31, 2004 Where is the drain on the radiator? am I blind or what??? What is the procedure for removing the air? Link to comment Share on other sites More sharing options...
zippy Posted March 31, 2004 Report Share Posted March 31, 2004 sounds like you just had alot of air in the system. Link to comment Share on other sites More sharing options...
slimsoftball Posted March 31, 2004 Report Share Posted March 31, 2004 Same thing just happened to me after my cam install. I didn't bleed the system the way I should have and the air in the lines made the temp guage crazy for a day. Link to comment Share on other sites More sharing options...
BenKey Posted March 31, 2004 Report Share Posted March 31, 2004 Where is the drain on the radiator? am I blind or what??? Driver's side, bottom. Link to comment Share on other sites More sharing options...
supraman Posted April 13, 2004 Report Share Posted April 13, 2004 Mine is doing the same thing.....and I am reading from my Predator Live data. Link to comment Share on other sites More sharing options...
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