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2001 DHS
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Discussion Starter #1
Today I noticed coolent low warning appearing on my dash. I let the car sit for a few hours and tried to check the reservoir, however I'm sure sure what level it should be at. I took a picture and marked the level with a red line for you folks to guide me.

http://s12.postimg.org/mdom92nyl/COOLANT.jpg

If the level is too low, roughly how much and what is needed to be added?

Thanks
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,849 Posts
Re: Coolent level low warning

Today I noticed coolent low warning appearing on my dash. I let the car sit for a few hours and tried to check the reservoir, however I'm sure sure what level it should be at. I took a picture and marked the level with a red line for you folks to guide me.

http://s12.postimg.org/mdom92nyl/COOLANT.jpg

If the level is too low, roughly how much and what is needed to be added?

Thanks
===========================
the proper level is right at the seam -
between the black top half and "used-to-be-white" bottom half -
there is a line that says FULL COLD -

roughly how much
I would guess somewhere around a quart -

what is needed to be added
a 50/50 mixture of antifreeze and distilled water -

you can buy straight - or pre-mixed -

but -
you have a leak - somewhere -
that needs to be found - and fixed -
 

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2001 DHS
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221 Posts
Discussion Starter #3
Re: Coolent level low warning

===========================
the proper level is right at the seam -
between the black top half and "used-to-be-white" bottom half -
there is a line that says FULL COLD -

roughly how much
I would guess somewhere around a quart -

what is needed to be added
a 50/50 mixture of antifreeze and distilled water -

you can buy straight - or pre-mixed -

but -
you have a leak - somewhere -
that needs to be found - and fixed -
Can I go to Wallmart and buy any brand and top it off or it has to be a specific one?
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,183 Posts
Re: Coolent level low warning

Yeah, that is DEFINITELY low enough to trip the low level warning. The surge tanks are known to crack and seep coolant after years of heat/cool cycles. Look for the chalky white telltale residue of dried Dex-Cool.

If you have Dex in it now, I'd stick with Dex-Cool, but most brands are compatible.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,849 Posts
Re: Coolent level low warning

Can I go to Wallmart and buy any brand and top it off or it has to be a specific one?
====================
there are now three different types of antifreeze -

the old green stuff -

orange Dexcool - that's what originally came in your Cadillac -

and "universal" that is almost like a mixture of both -

with that in mind -
remove the pressure cap - look into the reservoir -
and see what type is in there - buy the same type -

don't forget to find - and fix the leak -
 

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Registered
2001 DHS
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221 Posts
Discussion Starter #6
Re: Coolent level low warning

====================
there are now three different types of antifreeze -

the old green stuff -

orange Dexcool - that's what originally came in your Cadillac -

and "universal" that is almost like a mixture of both -

with that in mind -
remove the pressure cap - look into the reservoir -
and see what type is in there - buy the same type -

don't forget to find - and fix the leak -
I'll definitely find the leak and get have it fixed. In the meantime I want to fill it up since I'll have a 200 mile road trip in the morning. I had the coolant flushed about 2 months ago after changing the thermostat. The mechanic used a brand that he said is used by many manufacturers , I can't recall the name but it wasn't dex-cool. It's light brownish in color. So what you're saying is I should not top it off with any other ready mix coolant? It has to be the same brand?
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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19,849 Posts
Re: Coolent level low warning

I'll definitely find the leak and get have it fixed. In the meantime I want to fill it up since I'll have a 200 mile road trip in the morning. I had the coolant flushed about 2 months ago after changing the thermostat. The mechanic used a brand that he said is used by many manufacturers , I can't recall the name but it wasn't dex-cool. It's light brownish in color. So what you're saying is I should not top it off with any other ready mix coolant? It has to be the same brand?
============================
the TYPE is much more important than the brand name -
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
DEX was factory fill but unnecessary. Get a bottle of Prestone all makes all models and dilute to 50/50% with distiller water.
 

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2001 DHS
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221 Posts
Discussion Starter #9
Re: Coolent level low warning

I just went to Wallmart and got a bottle of Prestone Dex-Cool , I couldn't find distilled water. It looks like the coolant level is about half a quart empty. Would it hurt if I topped it off with just the Prestone straight out of the bottle without the water mix?
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
Up to 70% coolant is acceptable (depending on climate). For that amount, straight coolant won't hurt anything.
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,829 Posts
Re: Coolent level low warning

Distilled water: $0.89 a gallon at any supermarket. On the shelves with the filtered and spring water. Read the label.

Yes, GM allows a 70/30 coolant/water mix. It lowers the freeze point a bit and also raises the (pressurized) boil point a bit.

................ notice that the 50/50 line is out of sequence.
 

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2001 DHS
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Discussion Starter #12
Re: Coolent level low warning

After 1 week the coolant low warning came back on. This time I added about 6oz to fill the reservoir. I'm sure there must be a leak somewhere even though there are no visible traces. Even now that it's full the message comes back on. Faulty sensor maybe? I was thinking of changing the whole tank since it's leaking somehow, does the new tanks come with the sensors? Meaning will it resolve the warning message appearing even though coolant is full?
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,829 Posts
Re: Coolent level low warning

If the sensor/float/reed switch is bad, yes - a new tank/sensor will solve the problem. If the wiring/connector is bad, no - a new tank/sensor won't solve the problem.

Get into Amazon and enter your car, model, year, coolant surge tank. You should be able to find one for about $60, shipped. They come with the sensor (reed switch) installed.

Your proper coolant level is half full, cold. See the FULL COLD legend and arrow molded into your surge tank top ??? Follow that arrow across and down to the tank mid-seam.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
Joined
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19,849 Posts
Re: Coolent level low warning

After 1 week the coolant low warning came back on. This time I added about 6oz to fill the reservoir. I'm sure there must be a leak somewhere even though there are no visible traces. Even now that it's full the message comes back on. Faulty sensor maybe? I was thinking of changing the whole tank since it's leaking somehow, does the new tanks come with the sensors? Meaning will it resolve the warning message appearing even though coolant is full?
===========================

the serge tank is subjected to constant heating/cooling/pressure changes -
this causes the plastic to become brittle - causing thousands of tiny cracks -

here is the best deal I found on a new tank -
WITH a new level sensor - and a new cap -
$64.01 - with free shipping -
http://www.amazon.com/Dorman-603-122-Coolant-Recovery-Kit/dp/B003S5XCDQ
 

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2001 DHS
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221 Posts
Discussion Starter #15

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2000 DTS 194,000 miles, 2000 DHS 203,000 miles
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893 Posts
Crossover gaskets possibly, coolant pipe or quick disconnect possibly. Unlikely a headgasket but suppose it's possible. They just rarely leak externally, especially if they've just been done. Who did the job? Are they generally reliable?
 

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2000 DTS 194,000 miles, 2000 DHS 203,000 miles
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893 Posts
Well I'd check the heater coolant pipe first, and the quick disconnect and the crossover gaskets. Most likely the crossovers were put in new with the head gasket job so my money would be on the heater coolant pipes.
 

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1998 Seville STS, 2003 Deville
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282 Posts
Re: Coolent level low warning

^ :worship: I think Earl nailed it.

There seems to be alot of discussions on these quick disconnects here lately.
 
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