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johnmoore

coolant temp sensor

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I have a problem with my cooling fans not coming on the interior indicator is stuck at 194 when themastat opens I have good flow, new water pump, new hoses, and just had head gasket checked Also tested relays they are good I was told the temp sensor was bad but I can't find it to replace it. sounds dumb but I am getting nowhere and I don't want to blow up my caddy

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I have a problem with my cooling fans not coming on the interior indicator is stuck at 194 when themastat opens I have good flow, new water pump, new hoses, and just had head gasket checked Also tested relays they are good I was told the temp sensor was bad but I can't find it to replace it. sounds dumb but I am getting nowhere and I don't want to blow up my caddy

John,

Sorry that I don't know exactly where it is...but...please post this question in the regular CADILLAC DISCUSSION group.

You will get a lot more response.


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This is the first I have heard of the cooling temp frozen at a specific temp, very interesting

You should run your codes, click how to at the top of this page then DTC codes and follow the directions post any codes you retrieve here

I will post a wiring schematic as soon as I find it on my photobucket account


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

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One thing, put your AC on, it forces the cooling fans on, do they come on?


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

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Here is the location of the cooling temp sensor (circled), if I am not mistaken it is screwed into the rear head

Bank1Components-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

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I did locate the coolant temp sensor last evening thanks for the schematic. Tried turning the A/C on but the fans still didn't come on but We did find a relay next to main fuse block in engine that was corroded and the wires going into it were broken. according to diagram it is my inadvertant power supply relay?? The thing is I have had no problem from this car until now my interior lights and cig lighters quit working and then my fans and all this other stuff with the cooling system. I have been religious with my maintenance on this vehicle it just seems odd to have this many things go wrong at once.

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Does your AC compressor cycle? Does the compressor clutch engage? The AC compressor clutch and the coolant fan relays utilize the same fuse for power.

The three cooling fan relays are located in the inboard bottom center of the radiator, if that fuse is blown, the relays will not engage

You need to check your DTC codes, as I described in the above post #3

Here is a schematic for the cooling fans

CoolingFanPage1.jpg


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

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Here is page 2 of the schematic

CoolingFan2.jpg


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

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well guys thanks for all your help everything worked itself out and car was running like new then on my way home yesterday the car started to overheat but it wasn't hot and the onboard computer went crazy. I got stopped and shut it off and had it towed to a local shop. Head Gasket blew I had it comfirmed by cadillac UGH......... got five quotes they all told me buy a new engine it would be cheaper except one guy who has three devilles and he told me he would do it for me for just the cost of parts. he just wanted something to do. Thank god for good neighbors. But what I didn't understand was how could it blow like that when I tested it 5 days ago and it was fine. 4500.00 is way too much to fix actually cadillac was cheaper than two quotes I got. go figure so im off to go buy another car damnit I didn't want a car payment.

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well guys thanks for all your help everything worked itself out and car was running like new then on my way home yesterday the car started to overheat but it wasn't hot and the onboard computer went crazy. I got stopped and shut it off and had it towed to a local shop. Head Gasket blew I had it comfirmed by cadillac UGH......... got five quotes they all told me buy a new engine it would be cheaper except one guy who has three devilles and he told me he would do it for me for just the cost of parts. he just wanted something to do. Thank god for good neighbors. But what I didn't understand was how could it blow like that when I tested it 5 days ago and it was fine. 4500.00 is way too much to fix actually cadillac was cheaper than two quotes I got. go figure so im off to go buy another car damnit I didn't want a car payment.

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This went from a coolant sensor, cooling fans not coming on, to a bad head gasket, very odd


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

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I have a 93 Eldorado TC, with a 4.6 engine and want to replace the coolent temp sensor. I have read the post for newer Cadillac's, but they don't apply to my engine. Every thing I have read as to the location seems different. some say the sensor is located under (near) the cruise control bracket and others say it's on the passenger side. I have gone possibly beyond what is necessary searching for the thing--even down to removing the cruise control and throttle body but all in vain. I can find nothing on the passenger side that even looks close to even attempt removing things to find it. The only place I haven't looked is under the car. Anyone have this problem and or have found the thing, I would appreciate the help. If it's this hard to find, possibly diagrams as was provided in other post, would help.

Thanks

Vineyardman

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