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Re: While driving the car this a.m. blower and heat cut...
I don't know of any fuse in the line, but if mean where is the fuse box, i believe its inside the left door on the end of the dash, there will be a cover, inside cover there will be a list with numbers and explanations of what each is for with corisponding numbers on fuses, also if you don't find it there look under hood there will be another fuse box on left side, set up the same way.
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You have a bare wire somewhere either in your instrument cluster or under the hood where the blower motor is. It's located on the passenger side behind your computer it's easy to inspect the wires there cause they are all exposed.If a bare wire is showing just tape up with electrical tape or duct tape to keep it from arking out. If not that check that aground wire isn't fastened somewhere under the hood or on firewall. Check wires from fuse box all the way through the firewall could be dangerous. Also make sure you have the right amp fuse in if it tells you to use a 15 or 20 or 30 amp fuse make sure you have that one in.A lower number fuse will heat up and blow everytime.
Two possibilities. Volvos do have air quality system that will continue to run the blower motor even when the car is off when it senses excessive moisture in the system. This is to "air out" the system so that moisture doesn't lead to mold inside of the condenser,evaporator, etc.... Because that would cause not only bad smelling air but could also cause problems for people riding in your car when the air is on if they have mold allergies. Cannot say for sure if your car has that system, but if it does the fan should still cut off at some point, it has a fail safe so that it will not run the battery dead. Only other possibility that I have even seen for that symptom is the blower motor itself has an internal fault and recommended repair would be replacement of blower motor and resistor. I work at dealership and don't know exact price offhand but rough estimate $1000. Also if you do not currently have the money to do it you can use your a/c and heat while driving then remove the fuse for the climate control system when not driving, this will avoid running the battery down so you won't have to constantly jump start. Just remember to plug that fuse back in when you are going to need heat or air because with it out all of that will be shut off.
I must admit I am not too familiar with the Mini, but I believe it has the traditional heater set up, which is hot coolant flowing through a heater core inside the cabin to provide heat to occupants. If you only have cold air after driving for 10 minutes or so when the fan is turned on, check the coolant level. If it is low, it will not circulate through the heater core, resulting in no heat. This is a somewhat common problem to all vehicles, and easily fixed by topping of the coolant level, and, if necessary, bleeding any air out of the system. Let me know if this helps or not, I'll continue with other possibilities.
I believed the a/c blower is a relay activated. So no fuse getting blown to make it to go bad. Try to locate such relay (the ID label is found inside the relay cover assembly). Swap it with an identical one before making a trip to auto part store.
Have you checked to see if small vacuum line on firewall under the hood is a-ok ( no breaks or cuts) it's usually on passenger side and goes through the firewall to inside. Also I think when the heater core goes out you have no defrost either so when it is cold and wet outside your windshield will fog up.Also did you check your fuses.