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Re: Only getting lukewarm air from heater even with new...
Ok with the engine at operating temp feel both of the heater hoses. both should be hot, if one is hot and the other is not . then you have a clogged heater core. flush it out and you will have good heat.
also check the wireing system for the cooling fan for any obvious wires that have been added or repaired. if all ok check the relay located in the fuse box under the drivers side dash and fuse # 13 & #15... the fuse pannel on the drivers side strut tower ( under the hood ) also has a sub-fan water temp relay
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Check out the heater hoses for warmth. Both should be the same with the water flowing. If they are not, the water is not circulating.
There are 2 ways the heater can work. One style varies the amount of water flow to control the heat levels. The other uses the blend flaps in the ducts to push air flow around the heater core.
If the heater hoses are not circulating water, a part called a flow valve is to blame. Check out the autoparts sites for photos of the flow valve for your car. If you have the blend flap system, a solenoid called a "motor" is not changing the position of the blend flap in the dashes' ductwork.
you need a new or good used blower motor, they are located in the passenger side footwell, very easy to fix, just a few screws and an electrical connection. the blower motor is powered by "brushes" which wear out after a while and cannot produce the surge needed to start the blower. the bearings are probably also worn out which is why it is so loud. the reason it works as you drive faster is because in the fresh air position allows air to travel through the ductwork simply from the forward motion. if you put it on recirculate, you will notice this no longer occurs. the actual switches for the fan also like to burn up in these cars, if that was your case, you probably would have slowly lost the lower positions and then eventually all of them. something else to keep in mind.
this is more than likely a problem with your thermostat in the cooling system .heres a few things to check to be sure make certain your blower fan is on high and temp setting is in the hottest setting check to see if air is coming from your heater ducts also be sure to thoroughly let the engine warm up 10 to 20 minutes before checking. if the air is blowing but luke warm still your thermostat is stuck in the open position and will cause the engine to run to cold and performance will also suffer as will your heat will not be sufficient to heat the passenger compartment this repair should cost no more than $150 max to replace buy a repair shop this is a common problem in older cars and this is generally a quick repair to be made for almost any repair facility should take under 45 minutes to complete once repair is started
Check the water contol valve operation ( under hood connected to heater hoses), do you have a full load of coolant?, also air mix door under dash, is the temp of the coolant hot?.Check them all out, you'll find it