Ranger Heat Issue
I am kind of a gearhead, so if I don't use the right terms or describe something the right way, then bear with me, please.
I have a 1998 Ford Ranger 4-cylinder.
It happened maybe a month or two ago when all of a sudden my heat in the Ranger got lukewarm. The heat always used to be really hot. The blower fan was on level 4 when it happened. I noticed that the engine heat gauge needle started to go up and down, the heat then just became lukewarm on blower level 4 if you put your foot on the accelerator.
My neighbor who manages a bodyshop and who works on cars ALL the time replaced the thermostat, etc, and flushed/bleed the radiator twice.
The heat on blower level 4 didn't get any warmer.
But what I have noticed is that if I have the blower level on 3, the heat is HOT like it used to be. I don't know why the heat won't work on 4, but is really hot like it used to be on blower level 3.
Anyone know what the problem could be?