Here's how to approach it (with caution and the right tools):
1. Safety First: Cool the engine completely before attempting any work. Coolant is hot and can cause serious burns. Also, protect your eyes and wear gloves.
2. Identify the Fitting Type: Carefully examine the fitting. There might be a small clamp visible. Some have a hose clamp around the hose itself, while others might have a built-in clamp within the fitting.
3. Remove the Hose Clamp(s): If you see a hose clamp, carefully loosen and remove it using the appropriate pliers (hose clamp pliers are ideal).
4. Disconnect the Hose: With the clamp removed, gently try to wiggle the heater hose off the fitting. It may be stubborn due to corrosion or years of buildup. A small amount of penetrating oil applied a few hours in advance can help. Avoid excessive force to prevent damaging the hose or the fitting.
5. Inspect the Fitting: Once the hose is removed, inspect the fitting itself and the hose barb on the intake manifold for cracks, damage, or corrosion. If the fitting is damaged, it will likely need to be replaced.
6. Replacement (If Necessary): Replacing this fitting is usually tricky and potentially requires:
* Removing the Intake Manifold: In many cases, the easiest way to replace a badly corroded fitting is to remove the intake manifold. This is a much more involved job requiring specific tools and knowledge.
* Replacing the Hose: You'll likely need a new hose to match the old one. Try to match the inner diameter and length carefully.
Tools You Might Need:
* Socket wrench set: To potentially remove the intake manifold (if necessary).
* Hose clamp pliers: For removing and installing hose clamps.
* Penetrating oil (like PB Blaster): To loosen stubborn connections.
* New heater hose: If the old one is damaged or deteriorated.
* New fitting (if necessary): This might require a trip to a parts store with the old fitting for comparison.
Important Considerations:
* This is a complex repair. If you're not comfortable working on vehicles, it's best to take your Astro to a qualified mechanic. Improper repair can lead to further damage or coolant leaks.
* If the intake manifold needs removal, expect a significant amount of work and potentially needing additional gaskets and seals.
* Pictures are helpful! If possible, take photos of the fitting and its connection before you start disconnecting anything. This will aid in reassembly.
Before you begin, consult a repair manual specific to your 1989 Chevy Astro van. This will give you detailed diagrams and instructions for your specific model. This will greatly reduce the chances of further damage to your vehicle.
