2002 jaguar s type 3.0L I started having problems two years ago with my heater not blowing hot air until i turned the thermostat to high then it would send the heat. Now recently since its been hot outside, I've been running the a/c on 72 and it started to blow hot air. I could turn it down to 67 and was cold again. Now it has to be on LOW to get cold air. Is it an actuator?.
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Jeep Liberty heater not blowing hot air Questions & Answers ...
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Jeep Liberty cars & trucks heater not blowing hot air questions and answers. Ask your Jeep heater ... My 2005 Jeep Liberty will not blow heat through ... properly.
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.
Balance the tire and wheel assemblies with a dynamic spin balancer. and check to make sure neither is bent and check rotors and pads to see if there is any heat indicators like bluing of the rotors, spalling or surface cracks, shiny spots on the pads. If there is, flush the brake lines with new fluid.
Lack of heating may be thermostat stuck partially open all of the time, thermostat controlled fans meay be running when they should not be- may be a fused relay contact or defective temp sensor. If engine reaches oeprating temp and no heat in cabin, check to make there is no air bubble caught in the heater hoses. If you do not have flushing tee on the upper heater hose, adding one will allow you to purge the air- start engine cold, and crack open the cap to let air out. Let engine aproach operating temp, hold upper hose as high as you can to collect the air, and crack cap open again until no bubbles appear, use care as the coolant is hot at that point. Only shut engien down once cap is tight again.
Heater blowing cold air until I get on the interstate, then it works; however, when I stop at lights it starts blowing cold air again. The temperature gauge will be in the middle but the car will still be cold until the car starts moving.
Heater control valve faulty,
Air lock/blockage to heater matrix,
control unit voltage sender.
Check the above in this order. I assume you are operating heater control functions correctly and the heater display is showing no unusual infor.?
hope this helps. good luck.
Had the exact problem. Turned out that it was the thermostat that needed replacing, relatively cheap and quick by mobile mechanic. Things were fine for a year and the second time it happened I assumed it was the same problem. However, this time the thermostat was fine, wasn't sticking, and I had a slow leak in radiator, losing colant and causing engine to overheat, which paradoxically had stopped the heater working as well. Had to get new hose also by local mobile mechanic and everything seems okay again except for the intermittent "stuck in park" problem that a lot of people are also experiencing.
On the passenger side of the engine compartment near the radiator you will see a coolant control valve that has heater hoses running from it to the heater core inside vehicle.This is probably going bad.You can clamp off the hoses with some pliers while it is acting up and see if this stops the heat.If it does then it is probably bad.
Sounds like its the blend door actuator has failed or loose or cracked vacuum line going to it. These are usually not fun to replace although I dont know about your specific model, but most that I have seen you have to remove the dash.
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