Blocked off most of my grill, no change in coolant temps

[91CavGT]

I blocked it off yesterday on my Colorado by removing the front grill and putting duct tape all on the back side of the grill. This keeps it looking decent, and it is easy to remove. There is still two fist size holes in the front bumper that redirect air up to the radiator and there is a gap all around the grill that allows air to slip past.

In 88 degree weather today in stop and go driving as well as highway driving I saw consistant temps that were identical to what they used to be. 190-191 degrees according to Scan Gauge.

I got some great results according to the Scan Gauge in this mixed driving today (31.9 mpg and 32.6 mpg)so I am going to continue to test the grill block the way it is for one more week. If I continue to see consistant coolant temps then I am going to block more of the grill off.


I'd like to get minimum of 30 mpg city and 40 mpg highway, that is my goal.