Question about 1999 Cadillac Seville

1 Answer

'99 Seville Climate Control stuck on 75 Degrees and HI Fan

I just acquired a 1999 Seville and the Climate Control will not remain at a different setting than 75 degrees and Hi Fan. If I change the settings, or even turn it off, the setting will return to 75 and Hi Fan within five seconds or so. I have tried resetting the custom settings without success, but the owner's manual is not too descriptive of how to do this. Only that it can be done.

Thank you for any help,

Roy

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Master:

    An expert who has achieved Level 3.

  • Cadillac Master
  • 601 Answers

The most probable cause is a failed HVAC control programmer. However, it may also be a failed cabin temperature sensor, causing the programmer to think it needs to set max heating. You can try removing the negative battery wire for at least three minutes and then reconnect it - this should reset modules in the car and may resolve the problem.

Posted on Jul 05, 2017

5 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

cadman000
  • 607 Answers

SOURCE: Need to know coolant temp operating range for 1988 Seville

Entirely possible and in range. Depends on outside temps and type of driving. The radiator is colled by electric cooling fans, controlled by temp sensors. Fans should come on automatically when a/c is turned on

Posted on Mar 27, 2009

  • 534 Answers

SOURCE: HI. MY CADILLAC SEVILLE V8 4.9L '93, STILL

Ensure motor tune or other motor mechanical condition is not the cause of overheating, I assume the motor is actually running hot, - ensure the high gauge reading is not just a gauge sender problem. Check cooling fans are operating ok (as necessary when car warms up):- if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

If none of the above fix your problem, replace the thermostat again - it is not unheard of for a new thermostat to be faulty .

Posted on Sep 04, 2009

Testimonial: "THANK YOU."

  • 4336 Answers

SOURCE: 1999 cadillac deville 4.6 heater blowing cold

Besure that you have enough coolant. Your engine has head bolt issues and this allows compression gases into the sooling system, and this pushes coolant out and the heater goes cold before the engine everheats.... VERY expensive to fix correctly. There is a test to determine if exhaust gases are in the cooling system...

Posted on Nov 01, 2010

  • 37 Answers

SOURCE: display says it is running

Yes. Mine tends to run in the low two hundreds and will sometimes get to 225 before cooling down. I was told that this was they way they ran due to the aluminum engine. I have no idea whether it is true or not, but what I do know is that I have read countless forums from new owners asking about this, including myself at one point, and all the experienced owners tend to say,"Don't worry about it, this is how they run."
If you haven't already search 95 sls temperature. Try this one for starters:
http://www.cadillacforum.com/forum/aluminum-block-v8s-49/95-sls-overheating-11076/

Posted on Aug 07, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How to chech climate control switch on 99 crv


as for my japan model 99 crv, there is no switch for climate control. So pls chech again yr model. yr sincerely naing lynn.

Jul 09, 2014 | 1999 Honda CR-V

1 Answer

The heater only works some times


Cooling fans are on a thermostat and should only come on when needed. Climate control also only engages the interior fan when it is needed. Not sure if this helps but the question was a little vague, sorry if I missed the mark.

Jan 16, 2014 | 1999 Cadillac Seville

1 Answer

My cruise control suddenly quit on my 99 SLS. I checked the fuses and they are fine.


My 1999 cadilac seville quit running and has no power to the starter but power to everything else?

Sep 30, 2010 | 1999 Cadillac Seville

1 Answer

No lights on climate control


for the 99,

Set fan knob to #2 position

Grab and pull straight off. bulb is in there....

the 93' may be similar, but I do not recall

Jan 06, 2010 | 1999 Volkswagen Passat

1 Answer

I have 2 issues with my '99 300M climate control - the temp display is off most of time but occasionally comes on, and in the last few days the fan has been stuck at full on. The temp will still change if...


no ,the climate control assembly has a problem of shorting out to black,sometimes a good hit brings it back for awhile.the blower motor problem is the blower motor resistor,if you under the dash,behind the glove box you will find the blower motor,follow the motor wire about 10 inches away from motor and they plug into the faulty resistor.

Jan 02, 2010 | 1999 Chrysler 300M

1 Answer

2000 Volvo V70 climate control problem - blower remains in high, regardless of AUT 0-High setting. Vent selection and temperature controls work. Any idea?


Most common cause of this problem is a bad climate control power stage. The power stage control the speed of the blower fan on different settings, if it goes bad it defaults to full blast. There is a small chance the climate contro lunit itself is bad but more than 90% of the time, it is the power stage. It is located near the blower fan under the dash in the passenger footwell area. It makes it much easier to remove the glove box and knee bolster as well as the cover panel. It is rectangular in shape about 1.5" x 3" and black.

Nov 01, 2009 | 1999 Volvo V70

1 Answer

99 ford ranger is stuck on defrost. hot and cold controls still work but doesnt come out of defrost position.


defrost is usually the default/resting position for interior vents. you probably have a cracked/broken vacuum line between the climate control unit and the vent actuator

Sep 29, 2009 | 1999 Ford Ranger SuperCab

1 Answer

Climate control display for Outside temperature


Had the same problem, replaced the ambient air temp sensor in front of the radiator. Cost is like 10-15 bucks. Don't worry if temp doesn't change right away. Took me about 5 miles and then it worked great.

Sep 13, 2009 | 1999 Oldsmobile Intrigue

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

Related Topics:

39 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts

yadayada
yadayada

Level 3 Expert

75807 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22133 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8172 Answers

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

Answer questions

Manuals & User Guides

Loading...