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Weird Heating Issue

yz2009

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yz2009 Enthusiast

yz2009

Posted
Posted

So on my drive home tonight the heat in my truck wouldnt heat up like it usually does. Usually the heat gets warmer and warmer as the truck gets up to 210 degrees. Well tonight (it was ~35 degrees out) i had it on heat and it was blowing ice cold right until the coolant temp got to 210. Then it instantly started blowing hot air. I got home and pulled into my parking lot. As soon as i put the truck in park the heat turned to ice cold and my voltage dropped (to around 13 volts) and my voltage never moves of 14 volts usually. The lights also dimmed a little bit. While in park i reved the engine to 2000+ rpms and that brought the voltage up and after about 30 seconds the heat started blowing hot again. Any ideas?

 

It's a 2004 sierra 1500 sle with 132k

 

I've checked all my grounds and they are good. Battery is just over 2 years old. I havnt load tested it but it's never given me an issue

Colossus Senior Enthusiast

Colossus

Posted
Posted

Time for a coolant flush and a new thermostat my friend. That'll take care of things. Have a shop do a good flush on it. If you can find a shop that has one of these, it's gonna do an awesome job and will likely even get into the heater core and clean that out as well. You'll be shocked at the amount of crap that this flushing tool gets out that other flushing systems leave behind. I had it done and am a firm believer in it now.

 

 

yz2009 Enthusiast

yz2009

Posted
  • Author
Posted

seeing as im way overdue for a coolant flush ill make sure to do that first

 

that still doesnt explain why my voltage dropped so much when it was in park and the heat came back when i revved the engine however

yz2009 Enthusiast

yz2009

Posted
  • Author
Posted

Well on my way into work today the truck got to 240 before the thermostat opened. Looks like my thermostat is sticking and will be replaced tomorrow

  • 2 weeks later...
ttopcamaro86 Enthusiast

ttopcamaro86

Posted
Posted

Just an idea. Maybe a partially plugged line somewhere. Revving your engine makes water pump spin faster and force more coolant past the "plug". Hence better heat while rpm's up.

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