Replaced thermostat heater gets hotter than before but is still only warm. If I turn the blower on high it's cool. If I turn it down one notch it's warmer, each notch down it's gets warmer but not hot?
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Re: heater doesn't get very hot only gets warm
I had the same problem with my 96. What I found was that someone had placed stop leak in the system, so I had to take a garden hose with a pressure tip on it, disconnect both upper and lower heater core hoses and flush the core several times with the hose, my heater now works great.
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The air from the heater core will be as hot as the coolant temperature of the engine. 80 Degrees is the opening temperature of the thermostat and that will be where it remains until the engine starts to work or the ambient temperature rises.
Thermostats come in a couple of different opening temperatures so check around for one that opens around 85 degrees if you want hotter air in the cab
Another point is to close the recirculating vent door to the cabin as the heater core is trying to heat fresh freezing air if it is open
This may be a thermostant or a plugged heater core, locate the hoses going to the heater core in the engine compartment, feel both of them and see if one is a lot hotter than the other, if so then you may need to flush the core with a water hose, the other thing would be if the hoses are luke warm then the engine thermostat mat be stuck open.
Are the hoses hot to the touch? If not, then check your cooling system for either air-pockets or blockages. If the main radiator is also not hot when running and if the temperature gauge is reading high, then change your thermostat.
If, as you say both hoses are the same temp and hot to the touch, then is the interior blower motor turning? Have you checked the condition of any interior cabin air filter? Also check that the heater matrix core hasn't been clocked up with dirty/fir/fluff etc.
when you put the heater on hot and the blower on full and the car is running at idle, the coolant in the heater matrix is cooled quickly,as when the radiator fan comes on to cool the engine, have you tried raising the revs and checking the heater to see if it gets hotter. If this does not happen you could have air lock in the cooling system and may need bleeding properly.
check the coolant level in the rad,then check both heater hoses when the truck is warmed up they should be the same temperature if not then the heater core is plugged.you can try running/soaking the heater core with CLR to try to unplug it.if it doesn`t work then it will have to be replaced.also the thermostat may need replacing.
now there are several thing you need to check( since you know the blower and vents are working) start the jeep. let it warm up, sorry to do this to you, but turn on the heater. under the hood are two hoses going to the heater core, by the blower. after the jeep has warmed up, and heater running for about 2 minutes, check to see if either hose got warm or hot. If yes, bad heater core. if no, then the control valve that allows hot coolant to the heater core is bad. you can trace it if you follow the line to the engine, it is connected to a valve, and valve needs to be replaced( you can get it at the auto parts store). hope this helps you
The heat in your car comes from the heater core,it's a baby radiator under the dash,The coolant from the engine flows through it, So as the engine coolant gets hotter so does your heater core. If the coolant is not getting warm you might want to replace the thermostat,that will help alot. Your blower fan gets it's different speeds from a devise called "the blower motor resister" you will need to change that.
it could be the heater controls itself i had a 95 ford f150 that did the same thing i replaced everything i could as i live in upstate ny and in the winter it gets pretty cold so replaced all i could ,heater coil,radiator,thermostat,coolant and nothing a local mechanic told me to check the control in the dash to see if it was going all the way to the hot position. i took the dash apart to get to it and checked it and the cable that mmoves the valve on the heater coil was stretched so it wasnt going all the way to hot. not that its the same thing but its a place to start
The hoses from your heater core should be very hot to the touch. Check the hoses going to the core from the water pump. It should be very hot. The return hose should also be very hot. Now check the hoses going to the core. If they are not the same temp, then your heater control valve is not working correctly or the vacuum is not working. At any rate, locate the vacuum line going to the heater valve. Remove the silver bar on the valve from the plastic plunger arm. You will have heat all the time now if it was only a vacuum problem. You can fix it later when it's warmer out. BTW a 200* thermostat will make your heater even hotter.