Ok i have a 98 blazer. I kinda have 2 problems here but i think they're related. I bought it this past summer and i noticed that it ran a little cooler than normal (exactly in the middle of 100 210 in the summer). Well i thought of that as a good thing so i just let it be. Now i also had the rushing water sound behind the dash so i searched on here and found a forum by BlazerLT i think that said to replace the rad cap (with a non AC Delco cap) and add a little fluid in the morning when everything is bone cold. Well i did that and i still have the water sound.
Now my problem is now that it's starting to get cold, my heater just isn't all that hot due to something that's making the engine run too cool. It now shows the needle being just below the mark in the middle of the 100 and 210 mark. I don't know what kind of thermostat is in it but i've considered replacing that. There is also this stuff in a bottle at the local O"Reilly's that you poor in your radiator and it's spose to make your heater hotter. Would this be good or bad if i did this?
But where is the thermostat located and how hard would it be to replace if this is my problem?
Any help is greatly appreciated thanx!