GX - 1st Gen (2003-2009) Discussion topics related to the 2003 -2009 GX470 models

4.7 coolant hose

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Old 06-12-20 | 10:11 AM
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Default 4.7 coolant hose

Can someone help us out here. 4.7 V8 UZ

Noticed that the fan has shredded this hose.

What does the hose do?

Can I drive it like this until I have the part?






Last edited by Toys4RJill; 06-12-20 at 10:37 AM.
Old 06-12-20 | 11:07 AM
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That is the hose that connects the radiator filler neck with the coolant overflow bottle. Coolant moves between the radiator and the bottle as the temperature and pressure of the coolant makes it expand and contract.

Can you drive without it? For short distances - I think you can as long as you remain absolutely laser focused on the dash temperature gauge. Have a gallon of pink coolant in the car and check the radiator coolant level before every trip (when the engine is cool).

Personally I'd park it until the hose is replaced. An overheat will kill a head gasket and maybe the entire engine.
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Old 06-13-20 | 07:00 AM
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Like 101 said. Park it. Use another vehicle to pick up the replacement.

You should also check to see how much coolant you have lost: wait until you can touch the radiator cap with your bare hand, then look inside. Refill with the same brand that you already have in there.

Chip H.
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Old 06-13-20 | 06:36 PM
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Originally Posted by chiph9
Like 101 said. Park it. Use another vehicle to pick up the replacement.

You should also check to see how much coolant you have lost: wait until you can touch the radiator cap with your bare hand, then look inside. Refill with the same brand that you already have in there.

Chip H.
Originally Posted by 101
That is the hose that connects the radiator filler neck with the coolant overflow bottle. Coolant moves between the radiator and the bottle as the temperature and pressure of the coolant makes it expand and contract.

Can you drive without it? For short distances - I think you can as long as you remain absolutely laser focused on the dash temperature gauge. Have a gallon of pink coolant in the car and check the radiator coolant level before every trip (when the engine is cool).

Personally I'd park it until the hose is replaced. An overheat will kill a head gasket and maybe the entire engine.

Thanks to the both of you. We bought a fuel line hose and fixed the problem. Drove the vehicle tonight and everything seems ok. Now the overflow tank is a L once I have driven it for while. Do either of you know how much I need to add? Half way to F or all the way to F when cold?
Old 06-14-20 | 08:19 AM
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Copied from my owner's manual ...

Look at the see-through coolant reservoir when the engine is cold. The coolant level is satisfactory if it is between the “F” and “L” lines on the reservoir. If the level is low, add coolant. (For the coolant type, see “Coolant type selection” described below.) The coolant level in the reservoir will vary with engine temperature. However, if the level is on or below the “L” line, add coolant. Bring the level up to the “F” line.
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