vacuum operated valve in heater hose not opening
Addition:
Another possibility is that the heater core is plugged. The Dex cool coolant is notorious for clumping up and clogging up the heater core when exposed to air for a while (air pockets in the system after adding in coolant)
Disconnect the 2 hoses on the firewall that run to the engine (heater core inlet and outlet). Take 2 pieces of automotive hose or whatever you can get your hands on the make a snug fit around the pipes coming out from the fire wall. run a garden hose on the right hose (outlet). Don't push the garden hose directly to the heater core. you can damage it. heater cores can handle pressure 14-16PSI on average, a garden hose can do 40-70PSI. you risk damaging it. Run the water into the hose and keep an eye out on the other one and see if coolant is flowing, you can push the garden hose closer to the outlet hose on the heater core if needed, just be careful. once you're getting clean water all the way through and no chunks or pieces are coming out. Reconnect the hoses from the engine and start it up. You'll have to add some more coolant to make up for what was flushed out.
If both heater hoses were hot chances are the heater is not plugged and there is no vacuum operated valve in the heater hoses on that model. My guess would be the temperature blend door actuator behind the dash has failed.
Basically: when they are faulty.The original Thermostat on your Trail Blazer should last longer than the warranty, so 60,000 miles or more.Then the fun starts.There are poor quality cheap Thermostats out there that tend to not last longIf the cooling system is not maintained well and the car runs hot due to problems other than the thermostat the thermostat will fail immediately.If the wrong temperature rating is used the part will fail or not operate correctlyA cooling fan that is broken or not running correctly.ADVICE:Use a GM/DELCO brand part purchased from the dealer and watch for a hot running engine that will damage the thermostat.
About $9.00
The heater valve could be failing to open for one reason or another.
The thermostat on a 2001 Blazer is just inside the larger or upper radiator hose. This hose connects to the front of the engine manifold.
Factory said to use a 195 degree thermostat
There can be many causes of overheating. Clogged radiator, stuck thermostat, inoperable cooling fan, bad water pump, defective radiator cap, air trapped in cooling system, and blown head gasket.
The Chevrolet Blazer cooling system diagram can be obtained from most Chevrolet dealerships. The cooling system diagram can also be found at most auto-parts stores.
The thermostat in the 2002 Blazer will most likely be in the top radiator hose engine inlet, depending on the engine in the vehicle. The top hose is removed then the inlet unbolted to reach the thermostat.
No.
Should be a 195 degree.
Plugged radiator Defective thermostat Low coolant Defective radiator cap Water pump not circulating water fast enough Cooling fan not working
It could be a blocked heater core if your fan works... Or it could be your thermostat... I have an 03 that is doing the same thing. I just replaced the thermostat and it is still doing it. There is a site called BlazerForum.com you may get some better answers there