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Overheating nightmare

 
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  #1 (permalink)  
Old 31 May 2012, 07:23 pm
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Default Overheating nightmare

ok here go's.....

I have a 2002 woody non turbo. Car started overheating about 2 weeks ago.

My fan runs all the time because i have it hooked up to a switch.
Bought new rad cap.
Flushed system completely 3 times and added all new coolant.
Installed new thermostat and bled lines.
I have no smoke,nor any water in oil or vice versa.
Just replaced water pump about 15k miles ago.
Runs strong, have no problems other than the overheating.

If i let it idle in the driveway on a hot day it will idle all day at normal temp,
If i turn on the AC, it slowly starts to overheat but never gets really higher than 3/4 of the way.

If i drive without the AC on the highway at about 70, i can go for about 20 miles before it starts to overheat. If i slow down to about 35, the temp gos down.

Any help would be greatly appreciated as im leaving for vacation with the family in 2 weeks!

Next is maybe replacing the radiator? Maybe a clog?
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Old 31 May 2012, 07:30 pm
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Default Re: Overheating nightmare

How many miles on radiator and what is the deal with your fan?

Your rad could be tired and you must have a problem with the fan if you have it on a switch. Is the fan only operating at low speed?

Myslef I would replace the fan and radiator. then confirm the fan is coming on at high and low speeds. There is also a coolant temp sensor on the neck that neeeds to work properly.

Lastly if you have air trapped that could be an issue and if your head gasket is bad that could cause issues.

I know some dont like to hear this but is there a good chysler store near you, sometimes they can catch things you might miss. I have a couple good friends who are techs at the local store, so I can bounce ideas off them if I get stumped.
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Old 31 May 2012, 07:30 pm
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Default Re: Overheating nightmare

How's your coolant level? Does the level go up when the car gets hot and then does the coolant get sucked back into the system when it cools down?

Also, are you sure the fan is running, even when you flip on the switch? If the motor is bad, then it doesn't matter how it's hooked up.
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Old 31 May 2012, 07:42 pm
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Default Re: Overheating nightmare

121,000 on the radiator
Coolant level is high on hot and low on cold
Fan is on high all the time, its pretty loud and flowing good
when car is at idle i see no bubbles so im pretty sure its not the head gasket.
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Old 31 May 2012, 08:26 pm
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Default Re: Overheating nightmare

Hmmm... Well it's good news that the there are no bubbles in the coolant and that the coolant sucks back into the system from the reservoir. That indicates that it's probably not a blown head gasket.

It very well could be a clogged radiator. Next time the temp starts to climb over halfway, turn the heater on and the knob to full red. This will allow the coolant to flow through the heater core, which is a secondary radiator. That's just one way to get it cool down. As far as fixing your problem, it sounds like it might be worth a shot to replace the radiator.

Are you using HOAT antifreeze (5 year, 100,000 mile, orange color)? If the types of antifreeze's mix, or if a sealer is put into the cooling system, the liquid can foam up and start to clog the radiator and other components.
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Old 31 May 2012, 08:35 pm
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Default Re: Overheating nightmare

Yes turning the heater on high cools it down quick. Reading about the HOAT coolants right now. I used 50/50 prestone, so i i guess when i refill after new rad install, ill fill with Zerex G-05
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Old 31 May 2012, 08:38 pm
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Default Re: Overheating nightmare

The system is designed for the HOAT coolant. The biggest problem with using the other type is that if it mixes with the HOAT, the foaming can develop and can clog the radiator. If the previous antifreeze wasn't flushed completely from the system, this could have happened. You could try to backflush the radiator and see if that helps, before replacing it completely.
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Old 31 May 2012, 08:51 pm
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Default Re: Overheating nightmare

I already back flushed the whole rad, forward and backwards. Seemed ok, but im out of options, so i guess im going to replace it
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Old 31 May 2012, 09:29 pm
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Default Re: Overheating nightmare

Well, the fact that it cools down when the coolant goes through the heater core tells me that for some reason, the coolant is not cycling through the radiator. So at this point is seems to me that your best bet would be to replace the radiator.
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Old 31 May 2012, 09:40 pm
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Default Re: Overheating nightmare

Thats my goal for tomorrow. New rad is 130. Do i have to discharge the ac? Ive read i do and then others say i dont. Whats the easiest way to discharge without making a mess if i need to do it?
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