Question about 2004 Land Rover Discovery

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Heater works fine while driving, but when at a stop or engine idle, the heater starts blowing cold air. WHY?

There is a hint of radiator fluid, but the engine temp is steady.

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Possibly water pump not circulating water properly, have you checked the coolant level? Also thermostat could be jammed open.

Posted on Jan 02, 2013

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Posted on Jan 02, 2017

alicantecoli
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SOURCE: Heater blows hot air on driver side but cold on Passanger side ?

either the heater rad is chocked up and its not hot all over,or its a flap opening problem

Posted on Jun 26, 2009

  • 4044 Answers

SOURCE: 2002 Land Rover ~ Freelander - No heat coming from the heater

Look for two water lines about 1 in in diameter running back toward the condensor unit in the firewall. On one of those lines will be a control. It is sometimes vacum controlled. When they are vacum conrolled they have a tendency to get stuck or you may have lost vacum to the unit. You can use a vacum tester and short piece of hose to test this to see if you have lost vacum or if it is stuck closed. Connect the test hose to the control on teh hose and apply vacum to the unit. If the valve opens you will get heat in the vehicle. If it does not open then it is stuck in the closed position and will need to be replaced in most cases.

Posted on Sep 10, 2009

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  • 16 Answers

SOURCE: Starts fine when cold, after running dies on idle then wont start

Sounds like the fuel filter is dirty and needing to be changed. It's cheap and easy to swap out.

Posted on Jan 12, 2009

  • 60 Answers

SOURCE: heater not warm discovery 300tdi

i would check the thermostat first to see if stuck then check heater core

Posted on Nov 04, 2009

  • 1 Answer

SOURCE: Heating not working in landrover freelander 2001

I am having same problem with my freelander...blowing cold air. But I tried something like starting the veh and drive round for 10 mins then turn the heater speed control to 3 or 4....it started warming up and was OK until next day and I'm back with same routine...try it and see

Posted on Jan 09, 2010

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I have a 2010 ford escape..prob started as a coolant leak..took it to ford dealer, they repl water pump..a week later we noticed when u stop a red lite heater starts blowing cold air..took back to...


The performance of the heater indicates low coolant level. Pretty strange about the multiple water pumps, but if is is under warranty, you need to keep going back to the dealer. They must be missing something...

Dec 16, 2010 | 2008 Ford Escape

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The heater will not blow warm air until you start driving. The fan blows but its cold air. Once you start driving the air turns warm. Why?


There may not be enough coolant in the system. What happends is the heating core is nothing more than a small radiator inside the car. If the fluid is low the heating core is empty. But once you start driving the water pump works harder and fills it up. Another possible cause is a sticking thermostat. If its stuck open the engine cant retain water to heat it up. Thus blowing cold air. Whith the engine cold remove the radiator cap and check your coolant level. If it is full a replacement thermostat may be needed. HTH and dont forget to rate.

Dec 06, 2010 | 2003 Dodge Stratus

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The heater in my 2004 dodge stratus doesn't blow out hot air while idling, but it does when driving. Could this be the thermostat?


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My 08 Impala heater blows hot air when moving and cold air when stopped. Any suggestions???


My 2005 impala had the same problem. Here's the answer. The heater core is plugging up. When you sit idling, the fluid movement is slow, therefore the junk settles in the heater core, still allowing enough fluid to get through to heat. When you drive it, the fluid movement is much faster, therefore sending the junk into the heater core, plugging it up. To check for this problem: Get engine temp up to normal, feel both heater hoses. If one is hot and the other one is cooler, fluid is not passing through. Take off both heater hoses at the top of the engine, blow out fluid with low pressure.(5 or 10 lbs.) Fill both hoses with the right radiator flush. (Some engines are aluminum) Let stand for 4 hours. Flush with new antifreeze. (I used a garden sprayer) Stick the sprayer end in the heater hose and tape tight. My vent temp WAS 100 degrees. After fix was 152!!

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Heat blows cold when car is idling


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Heater blows cold air when idle


Sounds like you may have a partially plugged heater core. You could flush this out separately, from flushing radiator & engine block. Diconnect heater hoses going to your heater core and clamp off, so not to loose coolant from engine. Now hook up separate hose to one side of heater core pipe and flush out with typical garden hose. Repeat procedure on both heater core inlets. Reconnect original heater hoses and test difference. You may have to add an additional litre of antifreeze. If this don't work i suggest changing heater core. Good luck.........Ron.

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ok here we go and you aren't going to believe it...
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I noticed that I had a small leak at the engine side of upper hose fixed that by taking it off and cleaning it and putting the hose back on Step two

then while refilling the reservoir with coolant i found that the hose that was supposed to be in the fluid was curled up on top and not sticking down in the fluid where it should be.
played with the hose until i got it to fall down in the reservoir where it should be Step 3

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I really think that the hose in the reservoir not being in the right place and pulling air into the system instead of coolant is the real culprit of this drama, but i replaced the thermostat to be safe.

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