1997 S10 Blazer heater will not work (I live in Minnesota)
I replaced the thermostat but that wasn't the problem.... One of the heater hoses is hot, the other luke warm to the touch. I installed a "T" w/removable cap in the water pump heater hose to check flow - there was nothing at idle. Question 1: is the water pump hose the supply side? Question 2: is there a flow control valve in the heater circuit?
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Most likely thermostat, however first place to look is the heater hoses once the car has warmed up. If one hose is really hot and the other cold, you have either a stuck heater control valve (if the car has one) or a clogged heater core. if both hoses are luke warm, I would change the thermostat. I would suspect that it is stuck open.
While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.
CHECK FOR LOW COOLANT,NOT ENOUGH COOLANT IN THE SYSTEM.IF COOLANT LEVEL OKAY.THERMOSTAT NEED CHANGING STUCK OPEN.IF THERMOSTAT BEEN REPLACED.CHECK BOTH BOTH RADIATOR HOSES AND HEATER CORES HOSES THEY ALL SHOULD BE VERY HOT.IF ALL HOSES HOT AND BOTH HEATER CORES HOSES GOING INTO FIREWALL IS HOT.HEATER DOOR NOT OPEN ALL THE WAY OR STUCK.IF ONE OF THE HEATER HOSES GOING INTO FIREWALL HOT AND OTHER HEATER HOSE COMING OUT OF FIREWALL NOT HOT.MORE LIKELY HEATER CORE PLUGGED NEED TO FLUSH OUT COOLING SYSTEM.FLUSH OUT COOLING SYSTEM IF NOT BEEN DONE IN A LONG WHILE.
thermostat may be the key, also check to see that both heater hoses are hot , if both are luke warm suspect thermostat, if one is hot and one cold suspect heater core, if both are hot suspect blend door motor......HAVE FUN
One of 3 things could cause this, that I know. The thermostat has been installed backwards. The water pump broke soon after install. Due to it being a rebuilt one. And a small clog in the heater core. All of these things are easy to fix.
faulty thermostat will cause overcooling by staying open at all times.to check this.crank up vechicle until it warm up.becareful watch out for drivebbelt and cooling fan.feel all hoses.plus heater core hoses all hoses should be hot when engine warm up.if engine run until it get hot all hoses feel luke warm thermostat is bad. if all hoses get hot.check your fuses to HVAC mode switch.if all is good.you have a faulty heater air door or it could be stuck.your heater cores could be restricted stopped up.if you have climate control this is a dealership fix.