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Unread 04-21-2010, 09:29 AM   #1
Kasia
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1994 XJ Cherokee 
 
Join Date: Aug 2007
Location: Yardville NJ
Posts: 42
Replaced nearly entire cooling system...

My jeep overheated- it's been needing a new radiator and t-stat for a while, and I already have a hi-flow water pump for it and rad hoses. replaced with hesco 180 hi-flow tstat & housing, upper and lower hoses, hi-flow pump, radiator & cap. electric fan hasnt been coming on so i replaced that. still overheating, and i found out it's not pumping anything; it just sits in the radiator and overflow tank. took out the thermostat... still not pumping anything through. so it has to be the water pump... however, it's impossible to install the water pump wrong. the gasket only goes on one way, the pump bolts in one way, and the belt has been re-installed properly. the pump is brand new.

any help on this would be appreciated.

and i don't think anything's wrong with the motor, it sounds like it's running a bit rough but there's no coolant in the oil and no white smoke coming from the exhaust.

Thanks.

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Unread 04-21-2010, 09:55 AM   #2
XJH-007
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If you are 100% guranteed it's not pumping...it's the pump. Go back to a stock pump.

Or you have a massive air bubble. Have you parked on an incline (nose up) and bled the system?
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Unread 04-21-2010, 11:16 AM   #3
Willy36
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Some aftermarket pumps don't turn the right direction...
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Unread 04-21-2010, 11:30 AM   #4
Chris_Walker
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1988 XJ Cherokee 
 
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Was there a lot of crud in your coolant when you drained it? You might have a blockage somewhere. Also make sure there's not excessive amounts of air trapped in it. Open the radiator cap and try squeezing the hoses to see if any air bubbles come up.
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Unread 04-21-2010, 11:46 AM   #5
Tex96
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Is water pump pulley turning? In the correct direction?
Bad lower rad hose?
Run water into top of radiator- Flows out lower hose?
As mentioned above post #3 - is Pump Itself the 'Wrong' Way Rotation type? (There are 2 kinds.)

Year/Motor?etc.?
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Unread 04-21-2010, 11:52 AM   #6
XJH-007
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You could also test by removing the top hose from the radiator, and stick a garden hose in there....does it push through the system? (this will only work if the T-stat is open or removed)
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Scott-Crawlorado Native
I have an addiction.....
*00' XJ_T-n-T Y-Link/6" RE_OME's_33" KM2's
Tera 4:1 / 4:56's_Elec. Locked D44
**84' CJ7 4"BDS 33's
***02 WJ Overland
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Unread 04-21-2010, 11:55 PM   #7
mickc9129
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As mentioned above there are 2 type water pumps made. My '91 for instance uses a reverse rotation pump. There is a "R" stamped on the pump for reference. Also, you should have a coil spring inside your lower hose as it might collapse if it doesn't.
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Unread 04-22-2010, 12:16 AM   #8
nbleak21
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Yep, my guess would be HUGE air bubble or reverse flow pump.
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Unread 04-22-2010, 08:01 AM   #9
Kasia
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Yup, air bubble simpler than I thought... now I just gotta figure out why the electric fan isn't coming on.
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Unread 04-22-2010, 10:23 AM   #10
Willy36
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With the ignition on, unplug the switch and jump a wire between the two sides of the plug. If your fan comes on then, the problem is in your switch. If not, it may be the relay went bad.
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Unread 04-22-2010, 04:22 PM   #11
filluptrk
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2000 XJ Cherokee 
 
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If the jeep overheats but doesn't show on gauge then because of the air blocking fluid flow the temp sender in the housing isn't getting enough hot coolant around it to work. An engine can overheat with trapped air and not show hot on gauge.

Try pulling jeep up so drivers side is up to the left, and the pass side is down. On my 00 I have a lever vent cap so I just raised the vent and as the air in the rad moved toward the high side it blew out into the overflow. I raised and lowered the vent while it was running and after a while it cleared the air out. Phil
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