My 91 5.0 has been running cold this whole winter. So I replaced the water pump because I knew it was starting to fail. (Water had to started to leek from the weep hole a couple months early, but then stopped and never did it again.) The water pump seemed to make no difference. So two weeks ago I replace the thermostat with a Duralast
192 degree. Again no difference. I installed it with the copper colored stub facing in the block. I dont think it is the temp sending unit because my fans dont even turn on until my enigine is nice and hot, according to the gauge. (fans have a thermostat stabbed in the radiator.)Does any one have any ideas? I would like to fix the problem but it is not as big a deal anymore now that it is starting to warm up here in Utah.
Evan