Question about 1986 Toyota Pickup 4WD

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Heater control knob wont slide from hot to cool

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If the lever wont move at all might b a rusted/bent cable sleeve, if it does move but doesn't change the temp then it might be as simple as the cable sleeve hold down clamp came undone

Posted on May 14, 2014

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Sprinter 310d 1999 blows HOT AIR only, how to fix this


Possible broken control knob button on heater control unit. Pull button off ( if possible ) and inspect back side for being broken/cracked. All the buttons should be the same and can be interchanged on the controller. Try switching with another to see if problem is corrected. If not, possible internal controller issue or blend door motor not operating properly

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The fan blower, even after changing it to cool -giving hot air


i would think the vent direction control isn't moving the heater box vent , stuck in the open position so only hot air from the engine ,strip out the control panel a check that the direction control cable is connected both ends ,

May 07, 2014 | 1999 Toyota Avalon

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No heat in my 98 expedition ,fan works,blend door works,but blows cool air


Make sure coolant (Water Is full)
The system is clog. Or Heater valve is not open when you slide the control knob to hot or cold.
-Check the heater valve by moving the control knob to hot and cold. The valve turns or not. If it turns then the system is clog. If not turn at all then the valve is not function. (the cable might be slip off/Hook or connect it back to the valve)
*If it turn then the system is clog.>>>Need to flush.
-Disconnect the heater hoses from engine (Both hoses) and flush it with garden water hose from both direction for couple minute.
Reconnect, fill or add more water to radiator to full then run.
You should be good to go.

Mai Lor

Feb 25, 2013 | Ford Expedition Cars & Trucks

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I put a brand new heater core, radiator, water pump an thermastat but it still takes forever to blow heat out an then it doesn't get that hot.. what's the problem? my vehicle is a 1995 jeep wrangler 2.5 4...


Could be the heater bypass valve is stuck or the heater core is blocked.
I'd check the heater core first.You may have trapped air in the cooling system or the heater core may be partially plugged up. Engine coolant is delivered to the heater core through two heater hoses. With the engine idling at normal operating temperature, set the temperature control knob in the full hot position, the mode control switch knob in the floor heat position, and the blower motor switch knob in the highest speed position. Using a test thermometer, check the temperature of the air being discharged at the HVAC housing floor outlets.
Temperature Reference
Ambient Air Temperature 15.5° C (60° F) 21.1° C (70° F) 26.6° C (80° F) 32.2° C (90° F)
Minimum Air Temperature at Floor Outlet 52.2° C (126° F) 56.1° C (133° F) 59.4° C (139° F) 62.2° C (144° F)
If the floor outlet air temperature is too low, Both of the heater hoses should be hot to the touch. The coolant return heater hose should be slightly cooler than the coolant supply heater hose. If the return hose is much cooler than the supply hose, locate and repair the engine coolant flow obstruction in the cooling system.
OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant flow: Pinched or kinked heater hoses. Improper heater hose routing. Plugged heater hoses or supply and return ports at the cooling system connections. A plugged heater core. If proper coolant flow through the cooling system is verified, and heater outlet air temperature is still low, a mechanical problem may exist.
MECHANICAL PROBLEMS
Possible locations or causes of insufficient heat: An obstructed cowl air intake. Obstructed heater system outlets. A blend door not functioning properly.
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be adjusted with the temperature control knob on the A/C Heater control panel, the following could require service: The A/C Heater control. The blend door actuator.
The blend door. Improper engine coolant temperature

Dec 04, 2010 | 1995 Jeep Wrangler

4 Answers

1989 chevy silverado heater blowes cold air. both heater hose are hot. bargraph adjust from hot to cold.what next.


Feel the hoses going into the heater on the firewall. If one is hot and the other is cool, then the heater control valve is not working for whatever reason. Check the flow valve.

Nov 07, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

I have a 2002 Mercury Sable 3.0. I noticed when


The clicking noise is the motor for the "blend door". The heater core and the air conditioning side share the same ducting. When you move the knob a small motor moves the door letting the respective hot or cool flow happen.
The heater core is probably blocked. The engineers at Ford have the coolant hoses bypassing the core with a WYE at the firewall. The coolant takes the path of least resistance and stops FLUSHING the heater core and it eventually clogs.

Oct 12, 2009 | 2001 Mercury Sable

2 Answers

My a/c won't blow cold and heater doesnt get hot


Is the heater working? Turn the A.C. off with the car at an idle. Turn the A.C. on and listen for the compressor to turn on. (should hear a click under the hood and the motor should change pitch. If no noise, the compressor is not comming on. The o-rings were bad about leaking on these cars, letting out all the freeon. If there is no freeon, the low pressure switch won't let the compressor run.

May 20, 2009 | 1997 Ford Taurus

1 Answer

I have the same problem with my windstar blower is fine but is coming cold air but no heat i dont know what to do can any one show me how to fix it thnx


First, feel the heater hoses going into the firewall under the hood. If they are hot, then you have hot engine coolant going into the heater core. If they are not hot, then you either have a bad thermostat or you are very low on engine coolant.

Next you need air flowing through the heater core so it can come out heated through your vents. If the iar is flowing somewhere else, your temp blend door is not moving because the bend door motor is bad or your temp knob on your heater controls is bad. The blend door motor is an electric motor.

------------------------------------------------
Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob , mounted on the heater function selector switch, which is part of the heater control .
  • The function selector knob has the following positions: OFF, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST.
  • The heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318) . Refer to the System Airflow Schematic and Vacuum Control Charts.
  • An internal single-pole electrical switch is also controlled by the selector. The switch controls the electrical supply to the heater blower motor switch (18578) .
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
Temperature Control
The temperature control operates in the following manner:
  • Temperature control of the heater system is determined by the position of the temperature control knob (between COOL-BLUE and WARM-RED) of the heater control .
  • This control knob is connected to a potentiometer mounted in the heater control . This potentiometer is electrically connected to the electric blend door actuator that operates the A/C air temperature control door.


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  • Movement of the control knob from COOL (Blue) to WARM (Red) causes a corresponding movement on the air temperature control door and determines the temperature that the system will maintain.
System uses a reheat method to provide conditioned air to the passenger compartment.
  • All airflow from the blower motor (18527) passes through the A/C evaporator housing .
  • Temperature is then regulated by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
  • Temperature blending is varied by the air temperature control door, which regulates the amount of air that flows through and/or around the heater core (18476) , where it is then mixed and distributed.
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inside you plenum box:

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Mar 03, 2009 | 1998 Ford Windstar

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