![]() Be careful to keep your hands out of that area. Open the hood and observe the lower hose.Stop the car, place the transmission in Park (automatic transmission) or Neutral (manual transmission) and firmly set the emergency brake.When symptoms of engine overheating occur, follow these steps to assess the possibility of a collapsed lower hose: Alternatively, a warning light indicating overheating may come on. Your first warning will be a rising temperature beyond normal on your engine temperature gauge. This condition would be noticed while driving. Restricted flow through the radiator can result in the collapse of the lower radiator hose. See Also: How a Coolant Overflow Tank Works #3 – Clogged Radiator (Lower Hose Collapse) If the coolant hoses no longer collapse during this test, you have corrected the problem. Perform the engine warm up/cool down process described in step 5 of the “#1 – Faulty Radiator Cap” cause above.Reinstall the hose through its retaining clamps and reconnect it to the fitting on the expansion tank.A length of stiff wire can be helpful to probe the hose if a blockage is persistent. Remove this hose from its retaining clamps and using your garden hose, thoroughly rinse out any particulate matter that may be the cause of blockage. Generally, the vent hose will be routed downward through several clamps and end below the engine. ![]() ![]() (A stiff plastic reusable child’s straw will work best.) Blow through this straw. Insert a clean plastic drinking straw into the end of this hose.Do this carefully because expansion tanks are generally plastic, and you don’t want to break this hose fitting. To check for a blocked hose, detach the vent hose from the fitting on the expansion tank.If it is free of deposits, the problem is likely to be a blocked vent hose. After allowing the engine to cool down, remove the radiator cap.This will mimic the problem that occurs with a gummed up radiator cap.Īs with a faulty radiator cap, follow these steps: While a blocked vent hose is a relatively uncommon event, if it happens, it can prevent air flow back into the expansion tank as the engine cools. When using Dex-Cool or Stop Leak, checking the radiator cap for deposits at each oil change and cleaning it as necessary is recommended. Either follow the cleaning steps above or replace the cap. If with a collapsed hose you remove the radiator cap (when the engine is cool), and it is gummed up, one or both of these products may be the cause. Follow these steps if you notice a collapsed hose, either top and/or bottom.īoth Dex-Cool and Stop Leak deposits have a tendency to build up in the radiator cap mechanism. This can occur due to age or due to contamination of the radiator cap by deposits. The first and most common cause of a collapsed radiator hose is an inoperative one way valve in the radiator cap. Reason 2 – Restricted flow through the radiator (a clogged radiator) can cause the lower radiator hose to collapse.This vacuum problem may be caused by #1 and #2 below. This negative pressure will occur when the engine has been shut off and the normal return flow of coolant from the expansion tank is blocked. Reason 1 – A vacuum inside the coolant system will cause one or both radiator hoses to collapse.There are two possible reasons for a collapsed radiator hose: One or both hoses may go flat if the cooling system experiences a localized or complete vacuum (negative pressure) condition. What is the Function of the Radiator Cap?Ī collapsed radiator hose looks like a long skinny flat tire.Can a Collapsed Radiator Hose Cause Overheating?.Should I be Able to Squeeze the Radiator Hoses?.#3 – Clogged Radiator (Lower Hose Collapse).Registered in England and Wales, Company Number 2680212, our VAT registration is 766436989. Use may affect your credit score or make credit less accessible or more expensive for you. Pay in 3 is a form of credit, may not be suitable for everyone. Pay in 3 eligibility is subject to status and approval. PayPal Pay in 3: PayPal Pay in 3 is not regulated by the Financial Conduct Authority. Credit subject to status, UK residents only, Euro Car Parts Limited acts as a broker and offers finance from PayPal Credit. PayPal Credit: Terms and conditions apply. 22-24 Boulevard Royal L-2449, Luxembourg. PayPal Credit and PayPal Pay in 3 are trading names of PayPal (Europe) S.à r.l. (VARIABLE) | REPRESENTATIVE 21.9% APR (VARIABLE) | ASSUMED CREDIT LIMIT £1,200 REPRESENTATIVE EXAMPLE: PURCHASE RATE 21.9% P.A.
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