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Cadillac DeVille General Care & Maintenance

86 messages,  Last post on Apr 03, 2008 at 3:00 PM

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What is this discussion about? Cadillac DeVille, Auto Repair, Oil, Sedan


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#37 of 86
BREM by geo9
Jun 11, 2006 (5:51 am)
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Never attempted to remove the cap off the coolant
res. on my 03 DeVille.
You should just be able to "eyeball" the coolant
level and note the level. It should just unscrew
off tho..................
I would say its best to check when cold and engine
not running.
#38 of 86
Cadillac coolant cap removal by 04cad
Jun 11, 2006 (7:54 am)
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Replying to: geo9 (Jun 11, 2006 5:51 am)

I think you push down and turn (righty tighty - lefty loosey) to the left and then push down again and turn to the left again... do it when the engine is off and the engine is cool to avoid possibly scalding hot steam and/or coolant rushing out of the opening. I have had two vehicles, GM products, where the coolant level showed fine in the overflow tank and yet when I removed the cap the coolant was actually low. The first sign was the heater not putting out as much heat as in the past. If my vehicles have a radiator cap, I now always check in the radiator also to be certain. Good luck Bob
#39 of 86
Re: Cadillac coolant cap removal [04cad] by sls002
Jun 11, 2006 (9:03 am)
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Replying to: 04cad (Jun 11, 2006 7:54 am)

The actual radiator cap (if there is one) on the northstar engines is located under a plastic cover, so the owner really does not have access. Only the cap on the coolant reservoir is removable, and this is a pressure cap, so the intelligent owner will only attempt to remove it when the engine is cold. The coolant level can only be determined accurately when the engine is cold anyway, so it is pointless to remove the cap when the engine is warm, and foolish to remove it when the engine is hot.
 
My northstars have a reservoir that is transparent on the lower half and the coolant should be near the top of this transparent part when the engine is cold. When the engine is hot, the coolant level should be higher, possibly hidden in the opaque part.
 
If the cooling system has a leak, then the reservoir may remain full while the radiator is low. This is so because as the radiator cools the leak lets in air instead of water from the reservoir.
#40 of 86
THANK YOU ALL VERY MUCH, APPRECIATE ALL THE RESPONSES by bremertong
Jun 11, 2006 (7:46 pm)
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I drove forty miles today and no more check coolant messages. I will probably make another attempt at checking the coolant level using the coolant reservoir cap. As indicated in the posts and the owners manual, I will only attempt to check when the engine is cold. The service station checked about three minutes after the engine was turned off and said that the fluid level was at the neck line. While this could well have been a false alarm, I take these messages seriously and will be following the advice given here, again many thanks to all who responded.
#41 of 86
Re: THANK YOU ALL VERY MUCH, APPRECIATE ALL THE RESPONSES [bremertong] by sls002
Jun 12, 2006 (5:22 am)
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Replying to: bremertong (Jun 11, 2006 7:46 pm)

You really do not need to remove the cap to see the coolant level. However, this morning I did remove mine with the engine cold. It simply unscrews. When replacing it, it will "slip" like the fuel cap when tight enough.
 
As I said before, your cruise control problems might be an indication of wiring problems, and so if this was a false alarm, perhaps the wiring problem is speading. I do not put a high probability on this explanation however.
#42 of 86
Re: THANK YOU ALL VERY MUCH, APPRECIATE ALL THE RESPONSES [sls002] by bremertong
Jun 12, 2006 (7:49 pm)
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Replying to: sls002 (Jun 12, 2006 5:22 am)

If the coolant message shows up again I will schedule a visit with one of the Dealerships. The cap on collant resevoir on my car fits rather tightly mush more than the gas cap. We will see if the error message comes up again, performance of the cruise is the same and having had it checked by two dealerships I suspect it is in the normal range.
#43 of 86
FOLLOW UP ON MESSAGE CHECK COOLANT LEVEL by bremertong
Jul 18, 2006 (8:46 pm)
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Had the 2004 Deville in for regular oil change today. It turns out that the coolant level was a little low so in fact the computer message was correct when it posted the check coolant level about a month ago. When I stopped at a local service station when the message flashed they had said that the coolant level was okay but it was evidently low when we did the fluid checks today. Assume if the level had dropped to dangerously low levels the the engine temperature gauge would have risen or the service engine light would have come on. Assume all is okay now, when the message flashed again about a week ago I ignored it knowing I would be going in for an oil change today. I will take it more seriously in the future. The bottom of the car was also dry so the oil leak is evidently repaired. As some of you may remember one Cadillac dealership had put in to do a complete engine reseal but the second opinion at another Cadillac dealership was that oil filter adapter gasket repair had solved the problem and the oil remaining was a residue of the first leak. Cadillac was ready to do the reseal on the say so of the first dealer. It saved me a lot of time and Cadillac some money that I suggested that the car be checked at a second Cadillac dealership. Hope this information helps other owners in dealing with related problems. Also want to thank the many owners who responded to my concerns at this web site and forum.
#44 of 86
Re: FOLLOW UP ON MESSAGE CHECK COOLANT LEVEL [bremertong] by sls002
Jul 19, 2006 (7:27 am)
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Replying to: bremertong (Jul 18, 2006 8:46 pm)

You should not get any low coolant messages for a long time now that the coolant level is full. If the coolant level falls in the next few months there is a leak somewhere.
#45 of 86
Re: FOLLOW UP ON MESSAGE CHECK COOLANT LEVEL [sls002] by 04cad
Jul 19, 2006 (9:28 am)
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Replying to: sls002 (Jul 19, 2006 7:27 am)

As I said in my earlier message, if anything occurs to suggest low coolant, regardless of what the reservoir shows, figure out how to check the actual level in the radiator or take it to someone who can check it. The reservoir does not always properly indicate the coolant level. I have found that to be true on at least two GM models I have owned in the past, one a Cadillac. One wonders why the dealership doesn't tell you that when you buy the car? Also we had one dealership do a transmission pan gasket replacement only to have the same thing suggested nine months later. When I mentioned that if it indeed was leaking they would be responsible for fixing it since it hadn't been a year since they supposedly changed it under the extended warranty, they rechecked and said the person who changed it last time must not have wiped the oil off of the pan. Hmmmm. Funny thing, we hadn't noticed a leak on the garage floor the first time and definitely not the second time. I think the dealership is doing better now, except maybe when you get an oil change and they don't grease the front end on newer Chevy trucks, and yes at least up through 2005 Chevy Silverados do still have several grease fittings to lube. Live and learn Bob
#46 of 86
Re: FOLLOW UP ON MESSAGE CHECK COOLANT LEVEL [sls002] by bremertong
Jul 19, 2006 (7:50 pm)
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Replying to: sls002 (Jul 19, 2006 7:27 am)

While we did check for leaks while the car was on the lift,
we found none but in the event the check coolant message comes up again will get in to the more distant GM dealership ASAP. The original warranty runs out in July 2007 so I have
a year and have purchased an after market warranty that runs to 100,000 miles and seven years. Car currently has 33,000 miles on it so my original warranty will run out on date rather than miles as I only expect to put about 10,000 miles on the car in the next year.

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