QuestionAir was on shut car off, when returned to car no air. NO HEAT . PLUGED UP NEW BLOWER FAN NOT INSTALLED STILL NOTHING. WHEN SWITCH IS TURNED ON IT CLICKS AND SOUNDS LIKE THE THING ENGAGES BUT NOTHING. WHAT COULD IT BE FUSES LOOK OK
AnswerRay,
I am looking at the schematic for a 2004 crown vic with the automatic air conditioning system.
What I am seeing is the blower motor gets its power from a 40A fuse inside the engine compartment. Have you checked that fuse box yet? It should be right behind your battery. If that fuse is good...
The next stop for the voltage is the blower motor relay... also in the box behind the battery. If that fuse is good, have someone else sit in the car and turn on the fan while you listen and touch the relay. You should hear/feel a slight click if this is being energized.
If you do not feel or hear the click... unplug the relay from the socket. Look at the relay itself. Identify where pin 86 would plug into. With a voltmeter check for battery voltage. If you do not have voltage here check fuse #15 in the other fuse box. If do you have voltage where pin 86 would connect to... check where pin 30 would connect. You should also read battery voltage here. No voltage on pin 30? This gets its power from the 40A fuse behind the battery. Fuse #103. Check it again. Now look at where pin 85 would connect to. Do a continuity check between this connector and a good ground. You should read resistance. This connector is the ground wire for your relay coil, so if you do not read resistance... it means you need to either clean your connection to this wire or tighten it up.
Ok, now... If you have voltage at both of the socket connectors for 86 and 30. With a small jumper wire, jump the connectors that pin 87 and 30 would connect to. This should kick on your fan. If it does... replace your blower motor relay. If it doesn't...
On the back of your control head harness plug... there is a black wire on the connector. Do a continuity check between this plug connector and a good ground. You should read resistance. If you do not, then the switch is not being grounded. Clean the connection and tighten it up.
I hope this helps you some. I know it might sound relatively in depth, but it is all simple checks that you shouldn't have to take it to a garage to do.
Your system is actually one of the easiest schematics that I have seen yet for the blower motor. 2 fuses, 1 relay, 1 switch (the resistor block is actually built into the switch) and a ground. Makes our job easier.
Ok, I hope this helps out a bit. If I can provide you any more assistance, please do not hesitate to ask. If you found this at all helpful, please remember to rate this answer. Thank you for your question and good luck in everything.
