:dunno: (mercury-man) i need some help guys on our way back from cjam we were twenty miles from home when our [c.control,clock,a/c]went bye-bye. found out later it was a 20a fuse blown we tried another one it blew also. can someone let us what to check for or needs to be replaced. thanks
Sounds like you are talking about fuse #6.
It goes to: A/C clutch, Rear window defroster, Anti-theft module, Clock, Trunk release, Lamp out warning module, Warning chime module and the cornering lamps.
You may not have some of these features.
You have to narrow it down. Does the fuse blow if you leave the A/C off?
Does it blow when you use the turn signals?
softtouch, not while in the lower cycle, would this effect my c.control to. plus i don't have some of those options, the radio makes a tick noise just after it's turned to the higher cycle then the fuse goes out and the radio still plays thanks for the (reply)
ok
when you used the phrase "not in the lower cycles" ill assume you mean something having to do with the blower motor setting. Havign said that, fuse 9 and 17 come into play as well being a 30 and a 15 respectively. You may have a very weighted down squirel cage from debris buldup and its bogging down the blower motor. Watch for the error related to fuse 17.
so.......................................first trick,, unhook your blower motor connector located behind the glove box and just to the left and see if your fuses continue to blow.
but.........................................
heres what you need to do
First, look at the diagram / pic of the fuse panel posted and tell us "the exact" fuse that blows.
from there, and while you are waiting on responses,, remove that fuse and tell us what does not work with the fuse out. I know you said the fuse was blown / blowing but remove it anyway.
make a list of whats not working from exterior to interior.
next, disconect each circuit thats non functional to your best ability. insert a new fuse and see if it blows.
If it does, you do not have all the circuits disconnected that are fused by this one that keeps blowing.
if the fuse does not blow after everything this fuse controls is diconnected, start connecting each circuit back up one at a time with a test drive involved. eventually the problem circuit will show itself.
Id suggest you stop using fuses and substitute in one of the silver circuit breakers instead. They will heat up and open, then cool off and close again. this will save you time as well as temptation of installing a fuse thats too large once you run out of 20a fuses.
jcassity- thanks for the info will start checking the fuses and get back to ya. mercury-man
Yes fuse #6 also goes to the cruise control module.
I am also confused by "higher cycle". Can you tell us what the label on the control actually says?
Do you have manual or automatic temperature control?
I think my '84 EVTM fuse panel is closer to your car than cassidy's '87.
(http://mysite.verizon.net/vzetk5cc/sitebuildercontent/sitebuilderpictures/FusePanel.jpg)
softtouch- what i mean't to say was when the blower is on high or low, i have a manual temp-control. i'm currently checking other options to see if i can locate this power surge. sorry for the goof!!! (mercury-man)
Can you confirm that it fuse #6 that is blowing?
The blower is on fuse #9 and it is the only thing on fuse #9.
The blower and A/C controls are two seperate parts of the same physical switch.
It is possible the two parts of the switch are shorted together.
(http://mysite.verizon.net/vzetk5cc/sitebuildercontent/sitebuilderpictures/ACManual.jpg)
im bettin on a boggin down hvac motor cause momma mouse built a nest.
im staying with fuse 9,,,,,,,,although flipping my laptop upside down,, could be a six:D
softtouch- the fuse that keeps going out is #6 (yellow 20a), i will be checking today for what else dosen't come on then let you all know. thanks again for your input mercury-man
:hick: okay guys here whats working headlights, turn signals,brake lights, 4way flasher (1) coachlamp, dashboard lights work and heres whats not working side marker lights,d.clock,interior backseat lights. my a/c blower comes on but does not put out any cool air,cruise control, as for the coachlamp not working i'm seeking another person to help get this resolved. i hope this is all the things that you needed from me if not just keep repling thanks. (mercury-man)
Move the A/C-Heater Function selector switch off of A/C Norm or Max. Put in on Vent. Can you now run the blower at high speed without blowing the fuse?
softtouch- i'll get back to this wed. morning because it's fricking hot outside. i sure could use a cooled garage to be doing this. could this be a bad blower switch or a relay switch!!!!
The blower motor should not be blowing fuse #6 no matter how bad it is. It should only blow fuse #9.
so what happens if the fues goes out again whats the next step to try.
If you study the diagram in post #8 you can see that fuse #9 is in the blower motor circuit and fuse #6 is in the A/C clutch circuit. These should be electrically seperate from one another.
You say the blower still works when fuse #6 is blown. Thats good, it should.
You say you can run the A/C without blowing the fuse #6 as long as you do not put the blower on Hi. Is this true?
The blower draws more current on Hi than on lower speeds. So what's going on? Is the blower drawing part of it's current through fuse #6 and overloading it?
If this is true then the problem is in the Function Selector Switch shorting the two circuits together.
OR is the blower being on high causing the A/C to cycle on longer and the A/C circuit is overloading fuse #6 all by itself.
OR is one of the other circuits that fuse #6 feeds drawing excessive current but not enough to overload by itself. When the A/C comes on we then have an overload.
Now you see how my mind works. Try to get your head into it with me.
As you can see my conclusions are based on your observations.
softtouch- my son pulled the panel out to check for any loose wires.the ground wire to the blower switch was not in it's slot very tight he thinks it might have touched another wire. could this be our power surge problem. trying to keep this from giving you a headache, i want to keep this a low fund project. thanks for your help.:cool:
The only way to answer that is to try it.
In the picture below there is a gray block thing hanging out of the cable harness near the dip stick tube. The thing with too much light on it.
This is the doide that is across the A/C clutch coil. Make sure it hasn't gotten too close to the exhaust manifold and melted onto a blob.
This is the driver's side of my '84 3.8
(http://mysite.verizon.net/vzetk5cc/sitebuildercontent/sitebuilderpictures/diode.jpg)
Make certain your connections at the blower switch are secure and the switch is not burned. There have been many instances of ac blower switches and connectors melting. Best advise would be to change them both.
I also agree with softtouch on inspection of the ac diode. It can easily be checked with a dvom. continuity through one direction, open in the other direction. If you have continuity in both directions the diode is shorted. Another alternative test would be to disconnect the ac clutch connector, if the fuse blows with that disconnected, then we could lean more to a short in the fuse 6 circut or MAYBE the blower circut, but that's a big maybe.
BTW, great pics of the schematics, softtouch.
Mike
softtouch- a/c doide wasn't touching the manifold but would like to know where i can pick up the blower,connector switch besides junk yard. any suggestions:america:
For the blower switch:
napaonline.com lists four, some under A/C blower and some under blower.
rockauto.com lists five, under HVAC blower.
I searched 1985 3.8L. I do not know what engine you have but I do not think it matters.
I could not find the function selector switch. You also need to consider replacing it as well. At least examine it real good.
thanks for info on blower switch would you trust the old ones at junkyards. these were also on the thunderbirds right, and i have a (v6 3.8L 85 cougar ls)
In my '84 shop manual:
A/C-Heater controls are the same in T-Bird,Cougar, LTD and Marquis.
They are probably the same in '85
If you can find them in a junkyard it's worth a try.
:bowdown: softtouch- My fuse problem is fixed. After checking all of the switches which are all working. My other options were to check the wires and "bingo" right above the left side of the engine bay there were three wires exposed touching the metal frame of my car. So after four weeks of fustration we get to enjoy driving our cougar again. thanks for all the diagrams and advice :cougarsmily: :cougarsmily: :cougarsmily:
ahh,, finally resorted to tracing out each wire related to ac and found some of them have not been so nice to you eh?:hick: :D
:rollin: jcassity- Just in time for another heat wave. :flame: My cool air can now freeze us out of the car. :cool: