My 99 chevy blazer is acting up. i had an engine put in it last month and just this week it has started blowing hot air out the vents only sometimes, the rest of the time it blows cold air out. seems like it only wants to blow hot air when im above 50 mph. now, my volt meter on my dash is acting crazy. i got my battery tested and its at 12.73 volts, so i know its not that. but when my window is up and i hit the up button on it the lights will dim and the volt meter on my dash will drop to about 12 and it normally reads 14. when the turn signal is on it does the same thing but only when the light is flashing. so it makes the needle bounce... anyone got any ideas. i have checked all my grounds.. im stumped. please help!
You need to check for a loose ground again. The dash seems to have a loose ground. Your heat and ac are controlled by motors that get input from your switch. You might try following that harness and see if there is a loose ground. Other than that I don't have a clue. You might also check near the firewall and make sure the ground strap there was bolted to the engine.
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ok well that problem went away on its own. weird i know... however now some days there is a really really strong antifreeze smell coming from my vents when the heat is on. im so so confused. any thoughts on this new problem?
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