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Radiator Troubleshooting


 
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Sykes
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Joined: 24 Jul 2006
Location: Los Angeles

PostPosted: Mon Jul 24, 2006 4:10 pm    Post subject: Radiator Troubleshooting Reply with quote

Installed a new 3 Core and the cooling syetem is only taking 3/4 gallon
of 50/50 mix. I get a seep out of the drain cock at the bottom of the radiator but only gas when the temp sensor is taken out at the back of the block. Replaced the t-stat and all the hoses-flushed out the block from the top of the block-just running a hose into it.

Any tips on trouble-shooting the cooling system flow? I did notice that the vacuum line to the heater control valve is cut and the other line that is
it's pair rotted out. It seems like having that heater on is a big deal-but
I don't see how it could prevent flow into the engine block.

Thanks for any help_Sykes.

Jeep XJ 4.)l Straight 6 240,000 miles AC
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ThePhantum
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Joined: 23 Jan 2004
Location: I knew it...I'm surrounded by Assholes!

PostPosted: Mon Jul 24, 2006 4:52 pm    Post subject: Reply with quote

Are you sure the water pump is moving coolant? Also, the t-stat needs to be oriented a certain way. There's a vent hole that needs to be at the top... otherwise air will get trapped in the block.

Just some guesses....
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97 XJ Sport with a bunch of stuff
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Sykes
Member


Joined: 24 Jul 2006
Location: Los Angeles

PostPosted: Mon Jul 24, 2006 6:32 pm    Post subject: Reply with quote

Water Pump is a year old and in good shape.

The t-stat was is new from Mopar and oriented with the "Up" etching up and the bypass hole lined with the gasket on the driver's side.

Was told on Jeep forum to run the car and fill-forget about blowing a head gasket-but on doing this for a few minutes there is no change in
the coolant level in the expansion tank and there is a bone dry empty space under the removed temp sensor on the engine block.
There is coolant when removing the lower rad hose.

Will jack up the car and try running it again-otherwise will tear down and
check block and radaitor for flow. If there was any change in the tank level-I wouldn't be so concerned. I probably have to run the car to get the water pump to circulate coolant but I wanted to confirm I don't have
some bigger problem like a blocked passageway.

Thanks_Sykes 87 XJ 4L Straight 6 240,000 miles
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ThePhantum
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PostPosted: Mon Jul 24, 2006 6:51 pm    Post subject: Reply with quote

Ah, you didn't say it was an 87 before. Yea, anytime you work on a closed cooling system, you need to purge it of air. Although this writeup is for the 2.2 and 2.5 engines, the same basic proceedures apply.

Question, since you were replacing the radiator, why didn't you convert it to an open system at the same time? Just curious.
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97 XJ Sport with a bunch of stuff
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Sykes
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Joined: 24 Jul 2006
Location: Los Angeles

PostPosted: Mon Jul 24, 2006 7:01 pm    Post subject: Reply with quote

If I loosen up the t-stat housing tomorrow and the expansion tank dumps its fluid-that would be a plugged t-stat vent. But as I have opened the temp sensor twice and heard gases escape-isn't this to the effect? The
coolant should have flowed at that point. But I have only run the XJ for
about 9min in three sessions and myabe this is the problem_Sykes

87 XJ 4L Straight 6
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