Question about 1997 Chrysler LHS

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Car overheats due to all the coolant being pushed out the reservoir overflow hose after it runs for about 10mins.

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You have the cart before the horse ... the coolant is being pushed out because the car is over heating ... not the car is over heating because the coolant is being pushed out.

When the coolant gets hot ... too hot ... it expands and it has to go somewhere. If your car is overheating, there is a reason for it ... clogged radiator, insufficient coolant ... extreme environmental heat ... blocked radiator ... too much demand on the cooling system due to heavy loading ...

You need to have a professional mechanic take a look for the real reason your car is overheating ... BEFORE YOU DAMAGE YOUR ENGINE AND COOLING SYSTEM.

Thank you for your interest in FixYa.com

Posted on Aug 30, 2010

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Should the rediator overflow hose be connected to the reservoir


Yes, it should. Heat expansion pushes coolant through the hose into the reservoir. When coolant cools, it will siphon back into the radiator until radiator is full.

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Yes it would overheat without circulation, but the coolant doesn't circulate through the overflow tank. That reservoir only gets coolant into it when the coolant gets hot and expands and pushes the radiator cap seal up to let coolant into the reservoir. When the vehicle cools down, the coolant contracts and the lower level in the radiator will siphon the coolant out of the reservoir back into the radiator. Coolant circulation is from the engine to the radiator and back into the engine...and also through the heater core.
You may have an air block in the heater core. Check by taking off the outlet hose at the firewall or at the engine and see if you have a slow steady stream of coolant, with the engine running and heater controls on high heat. If it was an air block, a steady stream should quickly start. If you get little or no flow, the core may be plugged and need flushing backward or replaced.

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Hi and welcome to FixYa!

Few things why the car overheats, here are the following:

- Weak radiator blower motor
- Clogged radiator
- Cracked head or head gasket
- Faulty water pump (coolant will not circulate if it's faulty)
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You will need to have them replaced to resolve the problem. Hope this helps and thank you for using FixYa! Have a good one!

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You got it right.
To determine which one is the right one:
1- Take ioff the thermostat, Run the engine without it. If water is coming out at the upper hose then pump is working.
2- Hook the upper hose back to the radiator without thermostat, run the engine and press the upper hose to see if coolant flowing throu it. If it is not then , the radiator gets clogged up.
3- At this point , you know what to do. One advice is that, get the new radiator if it is bad. Don't waste money to have it rebuilt. Good luck.

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1 Answer

Have new radiator, water pump hoses, belts; system has been bled; experimented with bypassing the heater core; thermostat removed...car still overheats. Also, coolant goes to the overflow bottle, but often...


The reservoir,and,or,the tubing from the radiator,to the reservoir may have a pin hole in it,or the tubing is sucking together.Replace the tubing,and the radiator cap,and the reservoir top.See if it will work correctly.Fill reservoir,and radiator,and let it run until the cooling fans cut on,then cut the engine off.Wait about 25 minutes,and see if the reservoir will drop in level,if so,repeat this process until the vehicles cooling system is normal.Make sure the cooling fans are coming on,and going off,with the ac off.If the cooling fans are coming on,then that is good,but,they must go off by them selves,or the cooling system is not cooling down.

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