Heater blower not working. How do I test, either it,s a blower problem or switch problem? The heater core was changed about 1-2 months ago and the blower stopped working, i used to be able to tap on the dash for it to kick back on now it doesn't work. and the the cigarette lighter doesnt work either. the fuses are good too

blower is first (lots of test yes)
blower on HIGH must work
the users guide in the glove box lists all fuses. on most cars.
lost that, no PDF then so is a paper only book.
the causes are (not the repair)
1: blower dead. must work at least on HIGH speed. heard and felt.
2: engine not 180f to 200f temp. oops thermostat bad (engine)
3: heater core clogged, is side AF or out side AIR.
4: dampers called blend door is dead (stuck closed) making core above useless.
5: controls to blower or dampers dead.

Hi Carlos, Im AL the owner of Big As Auto Repair.

Carlos, several things can cause no heat through the vents. Starting with the one that's mostly found. (1) Heater Core Plugged up. You see, when the heater core is restricted and the hot water is not flowing through the entire core it has little or no heat. (2) Thermostat stuck open. This can cause you to have very little heat because the water is not getting to operating temperature. (3) Low on coolant. If the water in the radiator get's low enough it also can cause little heat when sitting at an idle and get hotter while driving down the road. (4) Heater door not working properly. This is the lest likely but does happen. FIRST thing to check, "coolant level". SECOND thing to check, "coolant flow through the radiator" THIRD thing to check, "heater core plugged". Here's how to check the heater core. Drive your vehicle until its at operating temperature. Then grab one of the heater hoses going into the heater core under the hood. NOW grab the other heater hose coming out of the heater core. NOTE: If you can keep holding one, BUT must let go of the other one because its to hot to hold, then your heater core is plugged. You can try to flush the heater core but sometimes it doesn't help. But, lets try this first before replacing it. Take the heater hoses off the engine side NOT off the heater core itself. Plug one of the hoses up with something to keep the cleaner in the heater core, THEN, find a way to empty the core best done with shop air, then pour a radiator cleaner into the other hose until its full to the top, then plug it with something to keep the cleaner in the heater core. NOTE let it set over night then take the plugs out and flush out in both direction until the water coming out is clean. Sometimes this doesn't works, but its worth a try. Sometimes this cleans the heater core out and it starts leaking but, its worth a try. Carlos, hope this helps and please visit my auto-repair-website at: http://www.bigasautorepair.com/

check to see if there is plenty of antifreeze in radiator , may have a air bubble in system .

1. Check engine coolant.
2. Check heater core.
3. Check electronic control valve.
4. Check thermostat.

The problem lies within one of these four possible issues. =)

this sounds like one of your electrical door actuator modules is not working not letting air flow threw your heater core itself in the heater box assembly feel at the bottom of your heater box for a heat from the heater core if it is hot then the problem is misdirected airflow. If the door actuator works it might be the hand control that you

CHECK SEE IF HEATER BLOWER MOTOR WORKING, REMOVE HEATER BLOWER MOTOR HOT WIRE HEATER BLOWER MOTOR SEE IF BLOWER MOTOR WORKING BLOWER MOTOR FAULTY OR YOU HAVE FAULTY WIRING AT BLOWER MOTOR AND RESISTOR.

check heater coil

BROUGHAM

1. Disconnect electric-al connectors at blower motor, compressor cycling switch, power

module and radio lead-in connections.

2. Remove righthand windshield washer nozzle.

3. Remove righthand secondary air inlet screen from plenum.

4. Partially remove rubber molding above plenum.

5. Remove remaining screws and the primary inlet screen.

6. Remove blower motor.

7. Remove two screws securing compressor cycling switch to module and position

switch out of way.

8. Remove AC module cover attaching screws and the cover.

9. Disconnect heater hoses at heater core.

10. Remove screw and retainer holding heater core to frame top.

11. With temperature door in max. hot position, reach through temperature housing and

push lower forward comer of heater core away from housing, then rotate core

parallel to housing.

12. Remove heater core.

13. Reverse procedure to install.

Jeep Cherokee XJ Heater Core

Work for '92 models, but can use it like a reference guide.



Figure 1

1. Disconnect battery ground cable, then drain cooling system.
2. Disconnect hoses from heater core.
3. If equipped with A/C, remove evaporator/blower housing as follows:
   1. Discharge A/C system, then disconnect hoses from expansion valve.
   2. Disconnect electrical connector and vent tube from blower motor.
   3. Remove console, if equipped.
   4. Remove lower instrument panel attaching screws, then the lower panel.
   5. Disconnect electrical connections from A/C relay, blower motor resistors and A/C thermostat.
   6. Disconnect vacuum hose from vacuum motor.
   7. Cut evaporator/blower housing to heater core housing retaining strap, then disconnect heater control cable.
   8. Pry retaining clip from rear of blower housing flange, then remove the three retaining screws.
   9. Working from engine compartment, remove evaporator/blower housing attaching nuts, then the evaporator drain tube, Figure 1.
   10. Remove right kick panel, then the instrument panel support bolt.
   11. Pull right side of dash outward, then rotate housing downward and towards rear of vehicle until studs clear dash panel. Remove housing from vehicle.
4. Remove heater core to housing retaining screws, then the heater core, Figure 2.
5. Reverse procedure to install.

Figure 2

Personally, I'd pressure test the cooling system then look at the heater core to see if it leaks. It may just be a loose clamp or leaky hose.

Also can check the forum jpmagazine.com

I hope help you; good luck (remember rated this).

Either the blower went bad or the heater relay went bad. This does not sound like a heater core problem unless you where smelling a SWEET smell when it was running.