1999 Cadillac DeVille - Page 3 - Answered Questions & Fixed issues

Did you test the fuel pump electrical circuit ! Fuel pump relay ? c GM Fuel Pump Relay Testing

1999 Cadillac... | Answered on Oct 27, 2016 | 261 views

Visit the on-line store, know as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem. Deville 1996 1999 Factory Service Workshop repair manual

1999 Cadillac... | Answered on Oct 22, 2016 | 198 views

There is nothing really in the water-related part of the system that has anything to do with the fan. The hoses, thermostat, heater core, etc. are simply a conduit to move the water through the engine to provide cooling. The fan is the crucial element to avoiding overheating. While the car is in motion, air flows through the radiator, cooling the coolant down and removing the excess heat. Once you stop, however, or get in a stop-and-go environment, there is limited airflow through the radiator to provide this heat reduction. That is where the fan comes into play. What makes the fan work depends upon what you are asking the vehicle to do. Testing the fan circuitry is rather simple if you understand a few things. The fan only needs to run to cool the engine if the engine coolant gets above a certain temperature (usually about 220F). The fan will be ordered on and run until the coolant drops to about 180-190 (thermostat temp). The confusion is that the thermostat has something to do with turning the fan on. The thermostat only controls the flow of water through the system. It stays closed until the water temp reaches it setpoint (usually 180-190F), then open to allow water to flow through the engine. There is a coolant temperature sensor, usually installed near the point where the thermostat is, and it sends coolant temperature information to the ECM. The ECM uses this information to control fuel-air mixture and to control the cooling fan to operate when needed. The fan and the fan relay can be tested very easily by simply turning on the car's A/C. Even if your A/C unit isn't working, simply putting the dash controls to an A/C position, will automatically power up the cooling fans, since the A/C requires CONSTANT airflow thru the font of the engine to maintain cooling. If the fans don't work in the A/C position, then the problem is not likely to be the coolant temperature sensor. It is more likely to be a fan relay or the fan itself.

1999 Cadillac... | Answered on Oct 21, 2016 | 412 views

On this website you find information (diagram, description and location) about fuse boxes in Cadillac Seville (Fifth Generation; 1998 - 1998)

Maybe it help you.

Cadillac Seville mk5 Fifth Generation 1998 1999 fuse box diagram Auto...

1999 Cadillac... | Answered on Oct 19, 2016 | 342 views

the procedure is fully explained with photos in a work shop manual available from any parts shop

1999 Cadillac... | Answered on Oct 15, 2016 | 20 views

A bad tensioner can cause an engine to overheat in the sense that when a bad tensioner breaks, it will cause a loss of turning movement to all the accessories of the engine including the water pump, and when the water pump stops turning, the flow of coolant will stop and the engine will start to overheat.

1999 Cadillac... | Answered on Oct 11, 2016 | 111 views

Yes most definitely some times when the pumps go bad they weep coolant out a little hole especially designed for that purpose

1999 Cadillac... | Answered on Oct 11, 2016 | 28 views

Jim, Bleeding brakes 1999 Cadillac Deville.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Bleeding ABS Brake Systems
How to Bleed the Master Cylinder and Brake System

1999 Cadillac... | Answered on Aug 22, 2016 | 82 views

Spray lube in the lock cylinder. Most likely you have to open it from the inside of the trunk and replace the lock cylinder. Remove the back seat to get in the trunk. This is the biggest problem with key FOBs. No one opens a door or trunk with the key. The cylinders corrode and lock up the pins on the inside of them.

1999 Cadillac... | Answered on Jun 11, 2016 | 44 views

No should be bolt 15 mm.to remove.

1999 Cadillac... | Answered on Apr 05, 2016 | 107 views

Fuel pressure regulator is a good place to look. look at the extra injector that enrichens the mixture on a cold engine too.

1999 Cadillac... | Answered on Apr 03, 2016 | 94 views

Its the window switch. I stopped getting "clicking" action on my driver side/driver window button, so I switched it with one from a back window (meaning I couldnt roll down the back one from the driver side control anymore. This was temporary. I went to the junk yard and of 12 98/99 devilles, all of them had the switch pulled already. It is a pretty common problem I guess. New aftermarket cost around $80. All you need is a screwdriver to get at it, plug in the new one and you are fine.

1999 Cadillac... | Answered on Mar 13, 2016 | 644 views

the master switch is going. i had the same problem in my 99.

1999 Cadillac... | Answered on Mar 13, 2016 | 485 views

It sounds like the temp sensors for the cooling fan are going out.220 is above boiling

1999 Cadillac... | Answered on Mar 13, 2016 | 282 views

Try this to see if helps you figure this out. Try filling up the radiator with water. Start your engine with the radiator cap off look for bubbles the bigger the bubbles the worse the leak. Look for tan colored oil on the dipstick. When oil mixes with water it turn a creamy tan color.

1999 Cadillac... | Answered on Mar 13, 2016 | 188 views

The vehicle has gone into self protection mode. There was no oil pressure (hence the light coming on). Check if the engine oil level is correct, if so, you will have to call your dealer to find the problem. Could be oil pump or maybe just a faulty oil pressure sensor.

1999 Cadillac... | Answered on Feb 18, 2016 | 106 views

Oil Life Monitor Resetting (KD, KE)
The engine oil life monitor will indicate when to change the engine oil and the engine oil filter - usually between 5 000 km (3,000 miles) and 12 500 km (7,500 miles) since the last oil change. Under severe conditions, the CHANGE OIL message may be displayed before 5 000 km (3,000 miles). The vehicle must not be driven more than 12 500 km (7,500 miles) or 12 months without an oil change.
The engine oil life monitor will not detect dust in the oil. If the vehicle is driven in a dusty area, be sure to change the oil every 5 000 km (3,000 miles) or sooner if the CHANGE ENGINE OIL message is displayed.
Reset the oil life monitor when the oil has been changed.
Resetting Procedure
Press the INFORMATION SKIP button on the DIC control panel in order to display the OIL LIFE LEFT message.
Press and hold the RESET NO button until the display shows 100% ENGINE OIL LIFE.

1999 Cadillac... | Answered on Feb 17, 2016 | 465 views

Not finding what you are looking for?
1999 Cadillac DeVille Logo

1,954 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

Top Cadillac Experts


Level 3 Expert

85216 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Are you a Cadillac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides