If you're seeing a pink hose, it's likely:
* Aftermarket addition: Someone may have added it for a non-standard modification or repair.
* Misidentified hose: The hose might be something else entirely, perhaps part of a vacuum system or a component unrelated to the engine's primary air intake.
* Incorrectly installed: It could be in the wrong location due to a previous repair gone wrong.
To figure out where it *should* go, you need to:
1. Identify what the hose is made of: Is it rubber? Silicone? This can help determine its intended purpose.
2. Trace the hose: Follow it to see where it leads. This will give a clue to its function.
3. Check for loose connections: Look for any unattached fittings or ports that the hose might fit.
4. Consult a repair manual: A shop manual specific to your 1991 Cadillac DeVille will show a diagram of the engine's vacuum and air intake system. This is the best way to identify the proper location for any hose.
5. Take a picture: A clear picture of the hose and its surroundings will help someone with more experience give you better guidance.
Without more information, it's impossible to say where a pink hose should be connected. Use the suggestions above to help diagnose its purpose.
