#1 is great advise! Also, be SURE that you note how all wiring and connections come off. I had this done by a mechanic and had to take it back three times before they got the connections correct (I think I could have done it better myself).
Go to the auto parts store or amazon or the library. Find a Chilton's Manual for the Year and make of your car. In that book you will find step by step instructions on how to remove and reinstall your heater core
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That would be due to one of three possible issues.
1. Thermostat is stuck open. This should also show on the temp gauge if you have one.
2. Heater core partially clogged. This will cause less hot water to the core, thus less heat from the core.
3. Partially stuck blend door. If the heater blend door in the heater box is sticking, it will not pass all of the air through the heater core, reducing the heating effect.
For #1, replace the thermostat.
For #2, flush or replace the heater core.
For #3, service/repair the blend door in the heater box.
An air-to-air exchanger is used to recover heating or cooling and to improve the air quality of the building that it serves.Typically an air exchanger has two fans, one blowing air into the house and one blowing air out of the house. In the winter time the one fan brings the outdoor cool air through the core warming it with the warm stale air you are exhausting.In the summer time the warm air from the outside will be cooled as it enters through the core to save on your cooling.
Air exchangers often are used to perform many functions such as reducing air contamination, heating or cooling air entering the building, and humidifying or dehumidifying air before it enters the building.Air to air heat exchangers or heat recovery ventilators, are used to provide a balanced flow of air into and out of a building.Ultimately an air exchangers main function is to switch the stale inside air with fresh outside air while exchanging the heat or cool in the process.
There is some controversy about the savings of exchangers. Not only does it require electricity to run the air exchanger, but the air the exchanger brings into your house must be brought up to temperature. This may require that more electric is used to cool your building or that more fuel is also required for heating.
The amount of air that these air exchangers bring into a home may vary depending on how the system has been installed. The codes in many places require a minimum amount of air to be exchanged. Check with your codes official to see what the requirements are for you.
Air exchangers can be a very good thing for many buildings. Especially those that are very large and typically have a lot of occupants with little natural air exchange from doors or windows being opened. However they are also a health hazard if they are not serviced
All air heat exchangers will require regular maintenance. The problem is that this is almost never performed by homeowners, and unless they know about the exchanger it is often overlooked by contractors during service calls.The real problem is that clogged, air-to-air exchangers can make the indoor air significantly worse than it would be without the system installed at all.If you have a home that already has a heat air exchanger, make sure that you keep it very well maintained or disconnect it.
Many air exchangers are controlled simply by on and off switches, but in some applications where the removal of humidity is required, then a humidistat can be used to turn the machine on and off to achieve the humidity level that you want.In cases where there may be a lot of humidity the air exchanger may not be enough to solve the problem. Other devices may be needed to lower the humidity to the level that you want.
Geothermal Heat Pumps are usually associated with hot air heating and air conditioning. In climates that very seldom need air conditioning you need to concentrate more on heating. There is a very good way to use geothermal technology for very efficient and comfortable heating. Radiant floor heating can very easily be combined with a geothermal heat pump to give both comfort and efficiency.
Radiant floor heating has been the comfort and efficiency standard for many years. The feeling of a warm floor under your feet is priceless. Romping on the floor while playing with the children is great when the snow is blowing and the floor is pleasantly warm.
Geothermal heating has also been known for it's efficiency also. The drawback to hot air geothermal heating has been the air temperatures that are cooler than normal hot air heating systems. By combining the two types of systems you can have very comfortable heat and efficiency at the same time.
There are something’s that you do have to take into consideration before deciding on a system like this.
You will have to drill a few wells to extract the heat from the ground. The piping must be installing in the wells correctly for the system to work properly. The heat pump needs to be designed for hot water heating. You can not use a heat pump designed for hot air use and make it work for radiant heating. The radiant heat design must be figured to use water temperatures that are cooler than many radiant heat systems. A maximum temperature design should be 130 degrees F. To get this kind of design to work correctly you will have to use good quality heat plates and insulated under the heat plates. By following these guidelines I have designed systems that have heated houses very comfortably at temperatures well below zero.
If you decide to install this type of system make sure that the installer knows exactly what they are doing. This type of system requires many things to be done exactly right so that the water flows will allow the system to work correctly. The piping on the well side is very critical that it uses all the wells equally. On the house side the piping must be primary/secondary. Pumps and pipe sizes must be able to give very high flow rates so that temperature drop is kept to ten degrees or less. When working with such low temperature the piping and pumping becomes so much more critical.
By using these principles to combine two very great heating types you can have a very good heating system that perform very well for many years. The only other factor with this type of system is that you don not have the ability to get cooling from the system. That is probably the only drawback of this type of system. It would be great if there was a geothermal unit made that was heating only. The elimination of the reversing valve would be a cost savings and a plus overall. This system is best suited for cooler climates that require little or no air conditioning.
is the blower fan running? if not check fuse, blower motor relay, & blower motor.
did you vent (some call it burp) the cooling system? if not search. try this: put car in an inclined position (radiator highest). while coolant is COOL remove radiator filler cap (reservoir filler cap if none in the radiator). set heater to maximum heat. run engine. turn on fan. while radiator is warming watch, if not been vented, air bubble may come out, you may have to add coolant to adjust level as necessary. replace radiator filler cap. check reservoir coolant level too.
if return hose from heater core stays much colder than the supply hose, suspect there's blockage/s in the heater core. (flush heater core again. disconnect both heater core from the engine, attach garden hose to the return, run water till clean water comes out from the supply hose - you don't have to do this if this was the procedure you did).
thermostat: take it out & see if it's stuck open.
You must rock the engine foreward to remove the heater hoses. To do this you need to remove the bolts holding the torque struts to the engine. use a prybar and pull the engine foreward far enough to insert the long bolt you removed from the strut through the loop hole on the strut. This will hold the engine. Then you need to remove the sound insulators under the dash board. There is a black HVAC box under the dash, Look for the center floor vent outlet under the dash and remove it. Then You will be able to access a big square cover on the HVAC box. There is something like 8 screws that hold the cover to the box. Once the cover is removed You will find the heater core and the a/c evaporator (looks like a heater core but a little bigger). There is a plate that retains the heater core in the box. The plate is secured by a couple of bolts. remove those bolts, remove the plate, then remove the heater core. When installing new heater core, use petroleum jelly or some kind of grease like white lithium and apply it to the heater hose necks on the heater core to aide installation of heater hoses.
check the air temperature blend door actuator. this is the component that when you put it on cold it closes the door to let cold air in and when you put it on hot it opens the door to let heat in. these trucks have alot of problems with these.
Verify that you have heat coming from the vents.
Also do you use a heat pump system with electric emergency heat?
It may be that if it is to cold outside that the heat pump can not handle the load due to the cold outside and you will need to turn on the emergency heat.
Keep me posted.
No easy way the dash must be pulled out to remove the box underneath, the core is inside.It can be bypassed by diconnecting the hoses and connecting them to each other, but then you wont have heat or defrost.