Question about 2003 Jaguar X-Type

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Heater core leak?

2003 jaguar x type windows fog up on the inside when heater is running in cold weather. gets worse with fan blowing harder

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  • dakins2304 May 15, 2009

    mine does exactly the same thing.....been thru 3 winters now with the problem. Here's a cheap fix that I use: crack open your windows wide enough to clear the windshield, then leave one open just slightly for the whole trip, of course live in mississippi, but on cold mornings about 26 degrees!

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Probable heater core leak especially if core has external moisture.core must be replaced

Posted on May 08, 2009

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We had some subzero weather while I was on vacation. My 2004 Jaguar was parked outside for several weeks. We had another very cold, icy day, and heater did not work. Fan works, rear window defroster...


What is happening here is that the faster the heater blows air through the fan, the more it cools the liquid in the heater core, and so heat output is reduced. The root of the problem is either the engine is not warming up enough, or the heater core, and/or heater core lines, are plugged up, not allowing the water to circulate properly in the heater core. Here is what I would try.

1. Top off the radiator and overflow.
2. Is the engine warming up properly? Is your temperature gauge showing normal temperatures? If it is not, then replace the thermostat.
3. If steps 1 and 2 do not solve the problem, get the vehicle in a shop, locate the heater core lines, take them apart and flush out the heater core. Look for blockages in the fittings. Do a flow test on the core. It may be clogged and need to be replaced.

Jan 08, 2015 | 2004 Jaguar X-Type

1 Answer

The fan on the defroster works but it doesn't keep the moister off the windows.


If the air is blowing on the screen and it will not clear or gets worse the heater core is probrebly leaking coolant. This will actually fog the screen instead of clearing it. Check for coolant leak or a sweet smell of antifreeze around the heater box. If it is leaking the core will need to be repaired or replaced .

Mar 04, 2011 | 1997 Jeep Grand Cherokee

1 Answer

I have a jaguar s type , year 2000 , the heater is only blowing cold air


Sounds like your heater core could be blocked up or a blockage in the pipes. Most car heaters run off a heater core that cycles hot water from the engine's water jacket, or a heat exchanger around the exhaust manifold, through the core, with a fan then blowing this hot air through the vents to you. If the pipes from the water jacket to the heater core are blocked then no hot water will get through. Alternatively, the heater core or pipes may be damaged and leaking. Check to ensure you're not losing any coolant. If it's the heater core, there's really nothing for it but to replace it. I'm not 100% sure where it would be on your car, on my old car it was up behind the centre console, under the dash. Hope that helps. Cheers, John

Nov 23, 2010 | 2000 Jaguar S-Type

3 Answers

In cold weather the inside of all the windows keeps misting up


the fresh air door is stripped at the motor, jaguar has a bulletin, about glueing .....works for a while,
long term fix replace heater plenum assy......
Or rig the door to stay in a midpoint postion, access below the pollen filter

Jan 08, 2010 | 2002 Jaguar X-Type

1 Answer

The windows will fog up when the car is moving


Try to see if you smell coolant when it fogs up. You may have a slight leak in the heater core .

Jan 06, 2010 | 2002 Jaguar X-Type

3 Answers

Windows fog up on the inside when defroster is turned on


leaking heater core. The coolant level may be low also. What it is doing is fogging up the window with the steam coming from the hot engine coolant that runs through your dash board when the heater or defrost is on. This should be under some kind of warranty on an '08.

Dec 05, 2009 | 2008 Hyundai Sonata

3 Answers

99 Grand Cherokee fogs windows on warm defrost, but not on cold


absolutley,change the heater core,its a small radiator,with a tiny hole,it still works,but it leaks,it will continue to get worse over time

Oct 06, 2009 | Jeep Grand Cherokee Cars & Trucks

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