Question about 2001 Daewoo Lanos

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One heater hose is hotter than the other heater hose i think it might be a heater control tap/valve,i ve replaced radiator(new)aus made replaced new thermostat(genuine)water pump has been replaced at 103000kms with new timing belt,replaced coolant temp sensor and sender.the engine temperature on the interior temp gauge is showing under half way mark and the fans kick in.as i take off the temp on gauge drops just above 1/4.

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It sounds like you have a plugged or clogged heater core. If the heater control valve was bad, both hoses would be hot, or cool.

Posted on Jun 07, 2010

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2005 gmc savanna van...cooling system will not blow hot heat. water pump,heater core,radaitor and thrmostate replaced. is there any electrical problems/


don't know this van specifically, but some things to check, make sure cabin filter is replaced or clean, you didn't say if the blower itself works, if not, correct or replace. Check the hoses going to the heater core, if hot water is flowing thru the core, both hoses should be hot. Check the heater controls to make sure doors in the system are opening closing as they should, you may just be drawing in cold air and not going thru the heater core.

Feb 11, 2015 | 2005 GMC Savana

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Why I get lukewarm heat air flows ok, and the temp gauge does not move?


First check and see if the fluid in the radiator is up where it should be. When was the last time the thermostat was changed? Could be no good.These things cause just warm air If the blower is working as it should you will have air flow but it your antifreeze is not warming up like it should it will be cool. .

Jan 05, 2015 | 1987 Nissan Pickup

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Heater not getting hot


You need to check the car t cold start up by checking both the lower and upper radiator hoses. After a few minutes one should be hotter than the other. If not the themostat may be stuck open. also chech to ee if there is heater contro valve from the engine to one of the hoses going to the heater core and see if it actuates by moving the temperature control from cold to warm.

Dec 15, 2013 | Cars & Trucks

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Where's the radiator flush valve in the 2000 cadillac cater?


Dont flush untill you have removed the heater control valve because it has a piston and diaphragm setup vacuum on the line will cause the diaphragm to expand and not close causing the valve and hose to fail no matter how tight you clamp it. heater control valve is located at rear of engine bay passenger side near heater core hoses.

Mar 23, 2013 | 2000 Cadillac Catera

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Heater gets warm the goes Luke warm when blower is turned on


when you put the heater on hot and the blower on full and the car is running at idle, the coolant in the heater matrix is cooled quickly,as when the radiator fan comes on to cool the engine, have you tried raising the revs and checking the heater to see if it gets hotter. If this does not happen you could have air lock in the cooling system and may need bleeding properly.

Mar 23, 2012 | Ford Focus Cars & Trucks

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My in heater in a 2007 grand prix doesnt work the air blows but isnt hot temperture gauge looks fine an have changed out thermostat


You have a plugged up heater core. Try pulling the heater hoses of where they go into the firewall, put a garden hose with a spray nozzle in one hose and gently flush the system out. you will need to pull both heater hoses off to do this.

Feb 11, 2011 | 2007 Pontiac Grand Prix GXP Sedan

1 Answer

One of the valves going from the radiator to the engine i think is loose because its leaking anti-freeze and when i park the car there is this pressurized vapor coming out of the valve and my heater...


You do probably have a bad Heater control valve. Depending on the length of the hose you may be able to bypass the Heater valve by removing it temporarily and slide the rest of the hose left on the car onto the water fitting and tighten it down.

You should then be able to drive it to get a new part. Or just get a ride to get a new valve and replace it. You may want to replace the heater hose, get new clamps and a little Antifreeze to replace what you lost. The 2 problems are definitely connected.

I hope my solution is very helpful to you.

Jan 03, 2011 | 2003 Ford Taurus

1 Answer

How to replace a heater core


Heater Core Removal & Installation Front To Remove:
  1. Make sure you have the anti-theft codes for the audio and the navigation system, and then write down the audio presets.
  2. Disconnect the negative cable from the battery.
  3. From under the hood, disconnect the heater valve cable from the heater valve. Turn the heater valve arm to the fully opened position.
  4. When the engine is cool, drain the engine coolant from the radiator.
  5. Disconnect the inlet heater hose and the outlet heater hose from the heater core.
  6. Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines, the brake lines, and related parts.
  7. Remove the dashboard.
  8. Remove the evaporator.
  9. Remove the mounting bolts and remove the heater unit. Front heater unit honda-10-00-4128.gif

  10. Remove the self-tapping screws and the clamp.
  11. Carefully pull out the heater core so you don't bend the inlet and outlet pipes.
Front heater core honda-10-00-4129.gif

To Install:
  1. Using care, install the heater core to the heater unit and secure.
  2. Using care, install the heater unit and tighten mounting nuts and bolts to 7 ft-lb (10 Nm).
  3. Install the evaporator.
  4. Install the dashboard.
  5. Connect the inlet heater hose and the outlet heater hose to the heater core.
  6. Connect the heater valve cable to the heater valve.
  7. Refill the cooling system with engine coolant.
  8. Adjust the heater valve cable.
  9. Make sure that there is no coolant leakage.
  10. Make sure that there is no air leakage.
  11. Connect the negative battery cable.
  12. Perform the power window control unit resetting procedure.
  13. Enter the anti-theft codes for the audio and the navigation system, and then enter the audio presets.
Rear To Remove:
NOTE: The rear blower motor, the rear heater core, the blower screen, the rear blower resistor (heating/air conditioning system) and the rear power transistor (climate control system), the rear air mix control motor (climate control system) , the rear mode control motor and the rear expansion valve can be replaced without removing the rear heater-A/C unit.
  1. Remove the self-tapping screws and the clamp, and then remove the bolts and the rear evaporator lines with the rear expansion valve. If necessary, remove the rear expansion valve. Use a second wrench to hold the other fitting on the valve so the rear evaporator lines won't twist. Leave the first fitting loosely connected so you can use it to hold the valve while you loosen the second fitting.
  2. Remove the rear heater hoses.
  3. If necessary, remove the rear blower motor, the rear heater core, the blower screen, the rear blower resistor (heating/air conditioning system), the rear power transistor (climate control system), the rear air mix control motor and the rear mode control motor.
  4. Remove the self-tapping screws and the lower housing.
  5. Remove the self-tapping screws, and carefully separate the left upper housing from the right upper housing. Remove the rear heater core.
Rear evaporator assembly honda-10-00-4116.gif

To Install:
  1. Replace the rear heater core.
  2. Attach the heater hoses.
  3. Make sure no air is leaking from the left upper housing and the right upper housing fitting and from the upper housings and the lower housing fitting.
  4. Before reassembly, make sure that the rear air mix control linkage and door move smoothly without binding.
  5. Before reassembly, make sure that the rear mode control linkage and door move smoothly without binding.
  6. Reassemble the housing.
  7. After reassembly, make sure the rear air mix control motor runs smoothly.
  8. After reassembly, make sure the rear mode control motor runs smoothly.
  9. Refill the cooling system and make sure that there is no coolant leakage.
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Oct 16, 2010 | 2005 Honda Pilot

1 Answer

Defrost will not come out vents


Check your coolant level first. Next check your heater control valve. With engine at operating temp and heater on high, do this:

1. Heater hose from water pump should be hot (if not, water pump may be dead or thermostat is stuck closed)
2. Heater hose from thermostat housing should be hot (if not, thermostat may be stuck closed or water pump is dead)
3. Heater hose going to heater core should be hot ( if not, heater control valve is not getting vacuum from heater control unit, or valve is broken)
4. Heater hose returning from heater core should be hot (if not, heater core is blocked, undo both hoses to core and flush with water hose until clear)

Test thermostat: with cold engine cranked, watch water temp gauge. As it gets hotter and hotter, when the thermostat opens, the temp should drop suddenly and then go back up.

Test water pump: with engine at operating temp. Squeeze top radiator hose tight, when you release it, you should feel/hear a surge of water. It is much like when you pinch a water hose closed and release it.

Test vacuum from heater control unit to heater control valve: undue vacuum line from control valve. It should have a vacuum when pressed against you skin in addition to releasing the actuating arm on the control valve.

If there is no vacuum, a quick fix will be to disconnect the plastic actuator from the silver arm on the heater valve. This will let the hot water to always flow to your heater core.

Dec 17, 2008 | Jeep Cherokee Cars & Trucks

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