Question about 1999 Ford F150 Regular Cab

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4.6 liter has one heater hose warmer than the other. may be plugged core,or is ther a fuse to climate control switch?

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Look for a heater valve on one of the hoses if there is no valve i would say its a plugged heater core.

Posted on Dec 11, 2009

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The coolant flows through the heater core all the time. I'm assuming your not getting heat out of the heater. A good way to tell if the heater core is plugged is to get the engine up to operating temp. Turn the temp control on the heater all the way to hot, and put heater in the vent mode so it's blowing out of the vents in the dash. With the heater fan on low, is it blowing hot or real warm air out of the vents? Now switch the heater fan to high does the air stay hot or does it gradually get cold? If it gradually gets cold try reving the engine a little, no change the heater core is plugged. If it changes by reving the engine the water pump could be getting bad. I had a 97 Taurus that would quit blowing warm air at an idle I took the water pump off and the impellar on the pump was almost gone.

Posted on Dec 11, 2009

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1 Answer

Why is there no heat?


there could be a air lock in the cooling system and the heater core is full of air
bleed the air out or have an accredited radiator shop do it
make sure that the heater control valve is getting the signal ( cable, vacuum etc ) from the heater control switch ( climate control module) to turn the coolant system on to the heater core

Dec 31, 2015 | 1998 Dodge Durango

1 Answer

How do I replace a heater core on a '91 oldsmobile regency 98


  1. Disarm the air bags (See Disarming below)
  2. Disconnect the negative battery cable.
  3. Disconnect the heater hoses from the heater core.
  4. If equipped with electronic climate control, perform the following procedures:
    1. Disconnect the wires and the hose from the programmer.
    2. Remove the programmer linkage cover and linkage.
    3. Remove the programmer mounting bolts and the programmer.
  5. Remove the heater core cover and heater core assembly.
To install:
  1. Install the heater core assembly and heater core cover.
  2. If equipped with electronic climate control, perform the following:
    1. Install the programmer mounting bolts and the programmer.
    2. Install the programmer linkage and linkage cover.
    3. Connect the wires and the hose to the programmer.
  3. Connect the heater hoses to the heater core.
  4. Connect the negative battery cable.
  5. Fill the cooling system. Start the engine and allow to come to normal operating temperature and check for leaks. Check coolant level after the engine has cooled down.
  6. Check the climate control system for proper operation.
  7. Refer to the Air Bag section at the beginning of this Section, and arm the Air Bag system.

DISARMING

  1. Disconnect the negative battery cable and isolate the cable end with high-quality electrical tape.
  2. Allow at least 30 minutes to expire prior to entering the interior of the vehicle. The sir system is designed to maintain sufficient energy to deploy the air bag for a short period of time even after battery voltage has been cut off.
  3. Remove the `ir' (1990 Ninety Eight) or `sir' (all others) fuse from the interior fuse panel below the left side of the instrument panel.
  4. Except on 1990 Ninety Eight, remove the left side sound insulator, and remove the Connector Positive Assurance (cpa) lock from the yellow 2-way sir harness connector at the base of the steering column, then disconnect the connector.
ARMING

  1. If equipped, connect the yellow 2-way sir connector at the base of the steering column and insert the Connector Positive Assurance (cpa) lock.
  2. If removed, install the left side sound insulator.
  3. Install the `ir' or `sir' fuse in the fuse panel.
  4. Connect the negative battery cable.
  5. Enter the vehicle from the passenger side and do the following:
    1. For 1990 vehicles only-Turn the ignition switch to the run position and observe the supplemental inflatable restraint lamp on the instrument cluster. The lamp should remain lit for 5-15 seconds, and then go out. If the lamp does anything else, have the system checked.
    2. For 1991-93 vehicles-Turn the ignition switch to the run position and observe the supplemental inflatable restraint lamp on the instrument cluster. The lamp should flash 7, 8, or 9 times, then stay off. If the lamp does anything else, have the system checked.


      I HOPE THIS IS HELPFUL :-)

      -Scott

Feb 14, 2015 | Oldsmobile Cars & Trucks

1 Answer

Air blows cold even though i have it on warm


There are several things which can be done to diagnose the problem. First, with some of the Electronic Digital Climate Control units, if you have this type, there is a self-diagnostic routine a Technician can punch into the keypad for an evaluation of the system. You would need the sequence of the display buttons and a list of applicable Codes. This is something a Dealer would know.

Next, Check your heater hoses entering and exiting the heater core. This is essential in determining the presence of heat. Both hoses should be equally hot when the engine is running and the heater is turned on. If the water is not flowing through the hoses a water control part is bad or the heater core is plugged. This is when you look at water flow control valves or solenoids.

These control parts are activated either by direct cable, electric wire, or Vacuum lines. For the Vacuum devices, you should check for the presence of Vacuum to the operating Solenoid.

If you have equal heat in the heater hoses, then you look at the ductwork under the dash. A small flap control must be failing to route airflow past the heater core.

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Nov 28, 2012 | 2000 Mitsubishi Diamante

1 Answer

Heater not heating ? both hoses hot , fan works but no hot air ?


is the climate control switching over like from floor to defrost to vent ? maybe the flap door not working in heater box.both hoses are hot but is water flowing thru heater core.

Dec 26, 2010 | 1996 GMC Jimmy

1 Answer

Blower motor not working


If you have an owners manual look for the fuse for the blower. If the fuse is good then its 1 of 2 things. The blower motor or the climate control blower switch.

The Digital Climate controls use a switch controller which is under the hood and behind the engine. On my 2002 Mercury, the switch was behind the heater line from the intake manifold. The outside of the switch has 2 screws and 1 electric plug and is sticking out of the ductwork by the firewall. The part is about the size of a cigarette package with most of it hidden.

You may be able to get the 2 screws and electric harness off without removing the heater hose, but before I could get mine to clear the ductwork I had to pull off the heater hose from the manifold. You CAN check the new part as soon as you get the electric connector off the old part WITHOUT removing the old part, hose or screws. Just plug in the NEW and turn on the ignition with the blower ON and the fan should work.

If that fails its the blower motor.

Jan 11, 2010 | 2004 Mercury Marauder

1 Answer

Heater blowing out cool air


faulty thermostat will cause overcooling by staying open at all times.to check this.crank up vechicle until it warm up.becareful watch out for drivebbelt and cooling fan.feel all hoses.plus heater core hoses all hoses should be hot when engine warm up.if engine run until it get hot all hoses feel luke warm thermostat is bad. if all hoses get hot.check your fuses to HVAC mode switch.if all is good.you have a faulty heater air door or it could be stuck.your heater cores could be restricted stopped up.if you have climate control this is a dealership fix.

Dec 12, 2009 | 1999 Jeep Cherokee

2 Answers

1997 Bonneville SSE, when the heater is turned on, only cold air


you may have a failed blend air door motor/actuator. this part will regulate the amount of air from the heater core depending on the temp setting on your electronic climate control unit. if it has failed, it will be stuck at the temp that it was last set at when it quit working. it is also possible the heater core may be plugged up, but using the gm recommended dexcool coolant and flushing it out every 5 years, it should not be plugged up. you can pull the 2 heater hoses off the heater core on the passenger side of the engine compartment firewall and see if the heater core is the problem. caution-do not use a high pressure air hose to blow through the heater core as this could damage it and cause a leak!

Oct 15, 2009 | 1997 Pontiac Bonneville

4 Answers

Climate controls


Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.

May 21, 2009 | 1997 Lincoln Continental

1 Answer

NO HEAT ON 2000 FORD TARAUS


there is a valve on one of the heater hoses that is run by vacuum if it don't work hot water will not enter the heater core. If it does work maybe the heater core is just plugged up.A quick fix for that is swapping the heater hose's I know one is bigger than the other but if you can it will change flow direction and it will flush the core. It should work after that. Heaters aren't controlled by the cars computer they may be controlled by the controller but thats cars with climate control

Dec 15, 2008 | 2000 Ford Taurus

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