Question about 1996 Isuzu Rodeo

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Why would the hoses connected to the radiator collapse? and what would the fix for this be? The engine did not seem to be overheating and it does not seem to be leaking.

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Replace the radiator cap. The cap allows pressure to release when it gets to high but it also needs to allow coolant flow back into the radiator when the engine cools down. If it does not you will see the hoses collapse. If the hoses still collapse after replacing the cap than the hoses themselves may be getting soft and will need to be replaced as the next step.

Posted on May 28, 2011

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The hoses are in need of springs inside on that model they come with these from the factory to keep them from collapsing also the thermostat is delaying in opening up to creat a vacuum so watch your temp sensor in the future for over heating

Posted on May 28, 2011

  • John Riccardi May 29, 2011

    Thanks, but heater works fine, so thermostat probably opening fine; no sign of overheat, I think the answer is that air in engine caused water pump to collapse hoses, This model does not, NOT have heavy springs in hoses, from factory, anyway.

    I aimed the vehicle so i could fill the top hose, filling the engine with coolant/ water. Problem fixed. What's my solution worth to you ? I will provide unique analysis as to why & where coolant disappeared if you e mail me back, credit me one good answer I can use on another vehicle of my son's.... Jack

  • tim fredrickson May 30, 2011

    ok what is it


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My 2001 Pontiac Grand am is overheating. Thermostat is good and is not losing coolant

Plugged radiator, bad water pump, collapsed hose? Start the car and feel the upper and lower hoses to see if they collapse on themselves or pinched if a wrong hose was used. Sometimes the propeller in the water pump rusts off or fails so there will be little circulation.

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Connie, Were the radiator,water pump and thermostat replaced to try and fix the over heat issue or as maintenance. Engine overheating can be caused by a lot of things, Leak in cooling system, air in system, bad rad. cap, slipping belt, faulty thermostat or installed upside down, faulty water pump, plugged radiator (inside/outside), collapsing rad hose, faulty cooling fan, leaking head gasket, sludge plugging engine water passages, poorly tuned engine, etc..
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Not cooling,has new impeller and thermostate

Steve, there's many causes of overheating. You say you have a new water pump and thermostat, so it's obviously not those at fault.

Just a question ... you say your car is not cooling, but is it actually overheating? A faulty temperature sender unit (it screws into the engine block, usually..) can give an incorrect reading on your gauge.

If it is overheating - steam/you can feel the excess heat - is your radiator fan kicking in? Is your car overheating as soon as you drive it? Or overheating when stuck in traffic .. and the fan isn't kicking in..?

Other things that cause overheating which spring to mind include a blocked radiator and/or a collapsed radiator hose.

Hot coolant enters your radiator via the TOP hose and cools as it goes down the radiator, then back into the engine via the bottom hose. Check both top and bottom hose after the engine has warmed - sometimes a hose can become 'flat' and blocked.

Another thing that causes overheating is a burnt head gasket/cylinder head problem.

Switch the engine on and look at your coolant bottle - a continuous 'bubbling' indicates that exhaust gases are finding their way (via a burnt head gasket) into the cooling system.

Any oil in the coolant bottle also indicates cylinder head problems. Also check the oil dipstick. If coolant (because of a defective head gasket/head) has found its way into the oil system the oil on your dipstick may appear a creamy/greyish sludge.

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I'm having trouble with overheating my 2000 5.9L 4x4 Dodge Durango. I've replaced the thermostat,fan clutch, water pump & still running hot heater core.would flushing cooling system fix my problem

The radiator is most likely plugged. Flushing is the least expensive way to try to fix the problem. It may not clear a severely plugged radiator. Watch the lower radiator hose with the engine running. Accelerate the engine. If the hose tries to collapse, then the radiator is definitely plugged.

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How many miles on system. One item that most people never check and it has burned up too many motors to mention is the bottom radiator hose. The hose gets soft with age and it will look normal when you are looking at it, but once the engine is warm and the motor starts running at a faster speed, the volume of water moving through the system creates a suction that collapses the lower radiator hose and the engine gets hot because there is not enough circulation. If you have higher miles or years and haven't changed the upper and lower radiator hose, do so any way.

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With the engine cold remove the radiator cap. Start the engine. Watch the coolant. If you see bubbles constantly perkulating out of the coolant than you most likely have a head gasket that has failed. If you don't see a constant perkulation of air bubbles it probably wouldn't hurt to replace the upper hose and see if the problem is resolved.

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A collapsed hose will restrict (or completely block) water flow, causing a overheating condition. Before you do anything else, replace the hose. Some aftermarket hoses are available with a wound steel coil that will prevent a hose from collapsing.

Good time to replace all the hoses and thermostat. If I were you, I'd also flush the cooling system while I was at it. Probably wouldn't be a bad idea to take a look at your serpentine (or "v") belt to.

If your particular vehicle has air bleed ports, be sure to properly bleed all air from the system when refilling with coolant. Usually the bleed ports will at or near the point of attachment of both the upper and lower radiator hoses to the engine block.

Good luck!

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Ok, g35 coupe 06,52k miles Had over heating problem in april 2010,replaced thermostat, all's well. Now Jan 2011 overheating again, noticed upper & lower radiator hoses collapse, changed thermostat...

Heres a couple of things you can check. Start your car and remove the radiator cap,(before it gets hot mind you) when it reaches norm operating temp, look inside radiator to see if water is circulating. If its not moving, its a bad water pump. Also, youre hoses should never collapse, if they collapse when they get hot maybe you need new hoses? Finally, if those dont work, flush out your radiator. Open the bottom cockpit and use a garden hose and let it flush out the system while the car is running, about 10 mins should do the trick. If the radiator looks clean inside then it doesnt need flushed.

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The temp gauge on the instrument panel was

Sounds like the radiator is clogged, have the cooling system flushed, the water pump pumps water into the engine and it comes out the top hose to return to the radiator to circulate through it to cool, if the radiator is clogged the water pressure will build on the top hose, also look at the bottom radiator hose, if it collapses when you rev the engine the radiator is clogged, although sometimes the bottom hoses are reinforced with wire to prevent them from collapsing so just because they do not collapse it does not mean the radiator is not clogged.

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