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 | GMC Truck Forum - GMC truck talk, etc. |
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07-17-2007, 07:05 AM
| #1 |
| Full Member Join Date: Jul 2007
Posts: 20
 | Normal highway temps Fellas I was wondering what is the normal temperature of a 89 gmc sierra driving on the highway. Can a few of you guys tell me what your temps are when on the highway? |
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07-17-2007, 07:22 AM
| #2 |
| Senior Member  Join Date: Jul 2006
Posts: 2,516
 | A well operating cooling system will run the same temp at highway speeds as it does while at idle. The engine should only run slightly higher than the rating of the t-stat. The only variable here is if the vehicle is loaded with extra weight such as a trailer. The additional load on the engine with slower air speeds through the radiator will increase temps, but should increase both slow speed temps, as well as highway speeds. |
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07-17-2007, 07:47 AM
| #3 |
| Moderator  Join Date: Apr 2005 Location: Texas
Posts: 3,104
| should be around 220 if it has a 195 t-stat
__________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4 |
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07-17-2007, 09:57 AM
| #4 |
| Full Member Join Date: Jul 2007
Posts: 20
| what about a 180? I put a 195 to see how it would be but wouldnt a 180 make the truck run cooler? |
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07-17-2007, 01:10 PM
| #5 |
| Moderator Join Date: Apr 2005 Location: Texas
Posts: 3,104
| yes a 180 should let the truck run cooler but not much. probably around 210.
__________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4 |
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07-17-2007, 04:14 PM
| #6 |
| Moderator  Join Date: Feb 2006 Location: michigan
Posts: 3,932
| mine stays around 190 most of the time. the trans temp will climb if i stay on the e-way to long though.
__________________ member map add yourself |
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