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It sound like the heat and AC dash switch control unit has developed a short and effectively fused some contacts together.
The danger is that electrical shorts have the possibility of starting a fire.
The electrical circuit can be disconnected by removing the heater and AC fuses from the fuse box.
15 amp is a fair current draw and for it to blow after a few minutes means that there is a short in that circuit that is allowing a drain to earth that just exceeds the 15 amp. It is in the ignition part of the system and may be a bad connection ( water ) or a problem appearing in the ECM or relay . Run fault codes to find the area of the fault. Because it is taking time to blow the fuse, it will be difficult to find. Check all wiring for rub marks .
This happened to my 2005 LR3. The 'FIX' i used was to remove the AMP located under the passenger seat. Remove the top to expose the digital circuits, and proceed to heat up the entire board with a hair dryer. Basically you are reflowing the Solder, to make the connections again. It worked perfect, that was 3 years ago, still working today.
Here some solutions: Q: Turn it on but no air come out like use to ? A: Check the (heater) fuse. It could blow out ( Burn). Q: All fuses are good but the blower motor still no blow..? A: The blower's wire is burn or the blower itself is bad. Q: Every thing work but just No Heat ? A: Make sure coolant (water) is full. Q: Coolant/Water is full but still No Heat ? A: Heater hose is restrick (Clog)
check hvac fuse. if fuse is okay.check to see if blower motor getting power if yes blower motor faulty.if no blower motor control switch is bad if fuse and relay okay.
First thing I would do is check your fuses. If all of your fuses are intact, I would make the assumption that it must be the control assembly itself (your actual dash control unit) since to my knowledge it is the only point where the two exclusive systems (heating and AC) are integrated with each other, aside from sharing the duct and to some extent, the electrical system. Being that neither the heating NOR cooling system will work, it seems the only common denominator.
If you have blown fuse(s), remember that fuses almost never blow for no reason (wierd things DO happen on occasion!), and this is usually just a symptom of a deeper issue, such as a short or fault in your electrical system such as your fans, or other components, drawing too much current. Locked fan rotors will blow fuses, for example. Having to replace the fuse again in short order would indeed indicate the need to troubleshoot further.
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