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Registered
1997 D'Elegance
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48 Posts
Discussion Starter #1
So I was under the hood last week topping off m oil (thank you NS) and I noticed this hole in the back behind my engine. It definitely looks like something broke off, and I have no clue what it is. I think it's effecting my heater. It only blows hot when I'm giving it some gas, and blows cold while idling. Please let me know what's missing, and what all it could be effecting. I attached some pics.
 

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Registered
2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
That would effect airflow from the HVAC system, but cold heat while idling is usually a sticking thermostat.
 

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2011 DTS Premium w/1SD | 1999 Deville Base (RIP @179K Miles)
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404 Posts
It's nothing major, that hole is actually a "service" port. Normally, that area was covered as part of the plastic that surrounds the blower motor, If you need to service the HVAC system, you cut that part out to access some screws.

If you do some searching of the Northstar engine bay, you'll see where it says "Cut Here for Service".
 

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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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19,268 Posts
So I was under the hood last week topping off m oil (thank you NS) and I noticed this hole in the back behind my engine. It definitely looks like something broke off, and I have no clue what it is. I think it's effecting my heater. It only blows hot when I'm giving it some gas, and blows cold while idling. Please let me know what's missing, and what all it could be effecting. I attached some pics.
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actually -
that was where the blower motor resistor used to be on the older models -
before the newer style with the speed controller built into the blower -

it does need to be covered up -
cut the plastic cover of a coffee can to fit over the hole -
a little silicone seal -
and a few self-tapping screws = fixed
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,781 Posts
That didn't just "fall off". As advised, make a cover for it.
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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86,781 Posts
Sure.................or just fabricate one out of a piece of sheet metal, beer can, plastic or whatever you have lying around.
 
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