heater problems

The movement of air flow is most likely caused by a vacuum leak under the dash. The vent doors that direct air flow are actuated by vacuum. Check for leaks. As far as the temp control, make sure the switch on the dash is connected to the blend air door (under dash near heater core). This guide will help us fix it

https://www.2carpros.com/articles/car-heater-not-working

Please run down this guide and report back.

1997 ford ranger heater is not working. Changed the thermostat but that did not help.

Feel the two heater hoses. They should be too hot to hold onto for very long. If they are not, suspect a plugged heater core. They can usually be back flushed with a garden hose. Pull the hoses off the engine, not the heater core to prevent cracking the tubes.

If the hoses are hot, a common problem is the electric actuators on the heater box.

caradiodoc

The heater in my truck does not like to work. Sometimes it wil but most of the time it doesn't. It will start working when I trun the truck on and then after about ten seconds stop. It seems to work less when it is cold outside. I have replaced fuses and it didn't help.

Welcome to the site, your saying the blower motor stops blowing? Did you use a testlite and check the fuse circuits for voltage, when the problem is ongoing? Underhood fuse box, blower fuse 40 amp, hot all the time. Interior fuse box, 7.5 amp fuse, goes hot with key on. You can also use jumper wires from battery for voltage and ground to the blower motor connector, use inline fuse. See if the motor acts correctly? The speeds for the blower motor are controlled on the ground side, you don't need to worry about different speeds until you test the motor.

Blower motor blows ONLY cold outside air. I have replaced heater blend door lever. All heater hoses get hot and temp gauge shows normal heat, but can not get heat to blow inside. Want to know a solution on how to repair.
Thanks in advance.

There is likely a problem of some kind with the blend door. It could be the control head, the actuator or even the door itself could be jammed or broken. That will have to be determined through examination.

No heat, core is not pugged, is there an air blend door motor and how can I check it and replace?

Check that the cables are attached and functional from the heater controls to the door.

Could alos be a heater control valve used to shut the flow of hot coolant into the cab when the AC is running. It is usually located in a heaterhose. Could also be at the heater core.

Invest in a manual for this type of work. It is well worth the money.

Good luck and let us know. :)

When i turn the dials i get no ac or heat or air blowing at all. Don't know where to start. Maybe fuse, blower motor? I did notice 2 pipes cut that are near the back left of the motor? Need some help asap so i can fix before winter!

Do you have a multi meter to do some testing?That would really help.

Yes I do

First thing unplug the blower motor put the fan on high see if you have battery voltage across the blower motor connector? I believe the motor is under the hood on the passenger side on that truck.

Heater problem
1994 Ford Ranger 4 cyl Two Wheel Drive Manual

My truck's heater isn't working properly. I can feel the heat when the blower is off and I have lever on hot, but if I turn the blower on after a few minutes it blows cool air. The thermostat has been changed and it passed a pressure test. Any suggestions?

Are ou sure the coolant is full? Also, I need you to check somethoing. With the engine hot, running, the heater on high, feel both heater core hoses. THe should both be hot. Let me know what you find.

Joe

Yes coolant is full. Tested hoses as you said, top hose was hot, bottom was cool. How bad/expensive is it?

my heater is not working but it is blow what is is

Do you mean that when you turn on the heat, you have air coming out of the vents but it isn't warm?
If so, check your level of coolant first (engine cold). If low, add coolant as necessary.
If level is fine, turn on the car and while it's idling, grab the upper radiator hose with your bare hand; do you feel coolant going through it? You shouldn't until the car has reached normal operating temperature.
If you do, your thermostat is stuck open and you need to replace it (typically this condition also results in your engine taking a very long time to warm up, and your temp gauge doesn't go up a whole lot, at least not to where it used to).
If you don't, the next step would be to find out whether your heater core is clogged. To do that, let your car reach normal operating temperature, then turn on the heat. Both heater core hoses (the ones that go in the firewall) should be very hot. If one is hot and the other is luke warm or even cold, your heater core is clogged and you need to flush it.
Finally, if everything checks out fine, you may have a problem with your blend door. It may be stuck on cold.

Heater problem
1994 Ford Ranger

After the engine runs and temp gage says temp is normal but there is no heat. I checked the core for blockage and water flows thru the core unrestricted. Therostat appears to work properly. Is there a check valve in this system that could be restricting water flow to heater?

INSUFFICIENT HEAT
Ensure cooling system is operating properly. Check heater system hoses and core for coolant flow. Check for loose or misaligned cable to temperature blend door. and check blend door is not stuck closed

TEMPERATURE CONTROL LEVER
The temperature lever mechanically operates a cable to adjust the temperature blend door. Temperature blend door is in the plenum assembly. When temperature lever is in COOL position, temperature blend door closes off airflow to heater core. When lever is in the WARM position, air is directed through the heater core. When lever is in intermediate positions, heated air is blended with cooler incoming air to achieve desired temperature.

Is the blend door on 2000 2.4 controled by vacuum hose, which is normaly open.

How can I diagnose reason for Heat not blowing out hot air? I Started out by changing thermostat.

To find out if your heater core is clogged, feel both heater hoses (the two hoses hooked on the heater core inlet and outlet at the firewall) with car idling at normal operating temp and heat set on high. Both hoses should feel very hot. If one is cold or luke warm, your heater core is probably clogged. Flush it or replace it.
If you have a heater control valve on your car, make sure it's not stuck close. If you have one, it's probably in one of the two hoses with a vacuum hose hooked to it.

Also make sure your level of coolant is good and make sure there's no air in your cooling system (bleed it).

well I couldn't believe it in the least. I did the diagnostic as you said. One heater hose hot the other heater hose barelyt warm. So I just replaced the heater core.

30 minute job the heater is now like I always new it to be. Hot on all sides. Could probably flush the old heater core and use it again. the thing is copper the one I replaced it with is aluminum. But again no more than the cost guess I could just junk the old one.

so your heater blows nice and warm now?

my husband's Ranger will have minimal heat coming into the cabin of the truck. At times there will be plenty of heat to keep the cabin & passengers warm.
when we adjust where we want the heat to come from (dash/vents, foot, defroster). We have already replaced the thermostat twice. He says one hose will feel cool & the other warm. So we are at a stand still in finding out why we are not getting enough heat in the cabin 80% of the time. Also, the temperature guage doesn't move or will barely elevate.

Hi there,

First make sure your coolant is at proper level.
If it is check your heater core. It’s probably clogged. One way to confirm this is by turning the truck on and letting it reach normal operating temperature. Then turn heat on high. Now feel both heater hoses in the engine compartment (the two smaller rubber hoses that hook on the heater inlet and outlet on the firewall). Both hoses should feel very hot. If one hose is cold or lukewarm, that would confirm a clogged heater core.
Also, if your truck is equipped with a heater control valve, make sure it is not stuck shut. If you have one it will be probably in one of these hoses I mention above.

Good luck.

no heat in a 1994 ford ranger

first check to see if the coolant is full, if it's not you won't get any heat. then check tosee if your car gets to normal operating temp. you may have a bad thermostat.

Does the engine reach normal operating temp? Does the blower motor work? Heater hoses hot?

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch.
If you find that they are both too hot to hold, then the heat in that vehicle is controlled by a blend door that regulates heated air flow. it is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.