Jump to content
CaddyInfo Cadillac Forum

Recommended Posts

Well i just got Hosed by a local cadillac dealer they had my car for 4 days because the ignition switch shorted out and i had even told em so But they just had to go thru All their diagnostic crap and Finally decided to check the switch and YES it was shorted out just like i said it was But even with all their fancy machines they could not figure out Why the cooling fans were not turning on as i also had told them they said it was shoing no codes But when i checked the codes there was a P1660

Link to comment
Share on other sites


As you probably already know by now...

the P1660 is... Cooling Fan Control Circuits

I am not real familiar with the troubleshooting of this particular code.

I will let someone else help you diagnose it.

Posted Image
Link to comment
Share on other sites

Search this code in the archives, I posted schematics and lots of info on it

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

Search this code in the archives, I posted schematics and lots of info on it

================================================================

Thanks

i checked a few things today myself i did install a new thermostat and it was still getting a bit hot about 260 but no fan operation at all even the dealer told me the fans were not coming on before it would boil over DUH i wonder why they couldnt figure that out

But before i go off on a rampage again about that dealer i will check those drawing you posted i hope i can figure this out i am trying to get a house and sure dont need to be going out and buying a car on top of it because it does affect the credit rating

thanks again

gordon

Link to comment
Share on other sites

i tried finding the tech archives with digrahms on the radiator fans but could not find them could you possibly send them to me at my e mail address\flasht62@fairpoint.net

I worked on it all day friday and at least figured out how to run power to one fan and get it and the a/c to work at least but i hate to be rigging up toggle switchs on this thing to control that one fan the other one i could not get to come on BUT with one on at least it only goes to about 203 and stays there

thanks

gordon

Link to comment
Share on other sites

Cooling fans are a pain at times. I once had to wire a fan in one of my old cars directly to the battery with an alligator clip. It was such a pain every time I went to start it, I had to pop the hood and hook the clip up, then pop the hood to unhook it when I turned the car off.

I assume by your last post that you mean the fan wouldn't even come on with power going directly to it? If so, then maybe the fan itself is shot or has a short in it somewhere. A fan shouldn't be too hard to replace if that is the case.

big4870885.jpg

Link to comment
Share on other sites

Does the AC compressor not work? The AC Compressor clutch and the FANS are on the same fuse, check the COMP fuse. If your compressor clutch is overheating it can blow the fuse mine blew

Here is the P1660 thread, read it carefully for info. Especially see my post #37, there is a link to another thread that has a schematic. One of my strengths is searching the archives. I think you are going to find a blown fuse if your AC Compressor is not cycling

http://caddyinfo.ipbhost.com/index.php?showtopic=18391

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

Don't jury rig your car by direct wiring them, that is a VERY VERY last resort. I don't like the idea of circumventing systems, my dad used to call that Slam Bam Mechanics, I call it Half-Assed.

Check the fuse

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

well if i apply power directly to the non working fan i get nothing But if i hook it to the power connector for the working fan then apply power thru the relay it comes on

SOOO what now

Please let me know ASAP so i can go get what ever parts i need

Also

i turned on the ignition checked for power at the non working fan connector Nothing there either

Heeellllpppp

gordon

Link to comment
Share on other sites

This is a give an take, to help you with your diagnosis, you need to provide info, did you check that fuse AC COMP?

That the fan does not work with power, but works with the relay, is illogical.

BE CAREFUL, if you do not do this right, you can damage the PCM

In an e-mail you asked where the ECT sensor is. The Engine Coolant Temp sensor is located here, see the bubble

Bank1Components-1-1.gif

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

In response to my prior post, please don't think I was advising anyone to directly connect their fan to the battery. The ONLY reason I did it was because my car was going to the junkyard in less than a month anyhow, so I didn't see a reason to put any more time or money into it...but I still needed the fan to work.

big4870885.jpg

Link to comment
Share on other sites

You are getting too sensitive, I was responding to the TOGGLE switch statement in Post #5

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

You are getting too sensitive, I was responding to the TOGGLE switch statement in Post #5

I wasn't being sensitive at all. It just seemed to me after re-reading the posts that mine kind of reinforced the idea of a toggle switch or direct line, and I was just clarifying myself.

big4870885.jpg

Link to comment
Share on other sites

O/K

I found the sensor finally i was looking in the wrong area i guess

Now i need to know will the temp gauge still work if this sensor is bad and HOW do you get into it to remove it

i got 3 used relays and hooked em up still no fans working Unless i unhook the relay then jump the connector with a hot wire and then i can get still only one fan working and a A/C unit

that fan on the drivers side just dont want to work unless i hook it to the other sides connector then put power to it that way by passing the relay

Link to comment
Share on other sites

You are getting too sensitive, I was responding to the TOGGLE switch statement in Post #5

I wasn't being sensitive at all. It just seemed to me after re-reading the posts that mine kind of reinforced the idea of a toggle switch or direct line, and I was just clarifying myself.

I can understand a toggle, I did it on my 91... but that car became a POS when I had the tranny rebuilt by an Ahole who messed up the electrical system.. and when my fiberglass cloth top shell exploded off the car at 70 mph leaving huge glue spots all over the roof, and I said F it. Unless its a last resort, I cringe when I hear, defeating the PCM system... and direct powering

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

You are getting too sensitive, I was responding to the TOGGLE switch statement in Post #5

I wasn't being sensitive at all. It just seemed to me after re-reading the posts that mine kind of reinforced the idea of a toggle switch or direct line, and I was just clarifying myself.

I can understand a toggle, I did it on my 91... but that car became a POS when I had the tranny rebuilt by an Ahole who messed up the electrical system.. and when my fiberglass cloth top shell exploded off the car at 70 mph leaving huge glue spots all over the roof, and I said F it. Unless its a last resort, I cringe when I hear this as a first fix, defeating the PCM system... and direct powering. Consider it a challenge, read the schematic, test and fix it..

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

If its bad you will get a code, I doubt that its the ECT sensor

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

WELL i got the coolant fans to working turns out it was a bad fuse in the fuse block

Now i am getting the anti theft system light again and i think there is a short in the one fuse panel every once in awhile i can see a slight whisp of smoke come from it

i cleaned all the fuse terminals and then bought brand new fuses and installed them with a little electric grease on the spades That is when i began getting the theft system light again and for a time the check engine light would stay on even with the key Off and Out of the ignition switch and i dont have any power door locks now either for some reason

Is there a way to turn this anti theft stuff off

thanks

gordon

Link to comment
Share on other sites

If you have smoke there is some issue with the fuse connection, look for green corrosion on the socket

What did you clean the fuse sockets with? It is unusual for a fan fuse to blow, how do the fans look, rock the fan blades and see if they are loose (motor bushings)

When you get a text message on the dash, that means that there is a code set, check the codes

Did you pull the fuses while the battery was connected? If so, disconnect the negative cable and see if the code goes away, when the system restarts.

Scan all of the underhood sockets for corrosion

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...