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Jeep Cherokee Laredo

Tiny
TAMARA MOGUEL
  • MEMBER
  • 1989 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
Just replaced a water pump in my jeep but I did not replace the thermostat. When I ran the car after replacing the waterpump it still ran hot. Someone told me that there is a bleed switch on the engine. Is that true? If so, where is it. Also the antifreeze did not get sucked thru the engine.
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Thursday, March 17th, 2011 AT 1:05 PM

8 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Just for testing, remove the thermostat, hook everything back up. With cap off radiator, can you see/feel coolant/coolant passages? With a cross-flow radiator you may be able to drain coolant down enough so you can see the top couple of passages. Start engine, any coolant flow, see/feel? If there is an air-bleed on the cooling system, I couldn't find it? If coolant flow is blocked, try flushing the system.

How do you know it was getting too hot? I don't trust gages on older vehicles.
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Thursday, March 17th, 2011 AT 6:13 PM
Tiny
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It's a closed system and the temp gauge was all the way in the red and it began to smoke. There is no radiator cap. Just the cap that goes to the coolant receptacle (for lack of a better term).
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Thursday, March 17th, 2011 AT 6:17 PM
Tiny
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I'd still remove the thermostat for testing. I want to check for coolant flow. I'd have to look at vehicle.
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Thursday, March 17th, 2011 AT 6:49 PM
Tiny
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My bad, the 4.0L doesn't use a radiator cap, the others do.
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Thursday, March 17th, 2011 AT 7:00 PM
Tiny
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Right, but you don't see an engine bleed switch? Wondering how come the coolant did not begin to circulate thru-out the engine.
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Thursday, March 17th, 2011 AT 7:01 PM
Tiny
JDL
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I couldn't find an air-bleed in our database? Is there a valve on the water pump or thermostat housing? I'd still remove thermostat, if there is an air block, it should move out. Also, remove cap on reservoir.
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Thursday, March 17th, 2011 AT 8:00 PM
Tiny
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Thank you! I am working now and will try this once I get home.
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Thursday, March 17th, 2011 AT 8:00 PM
Tiny
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Let us know what you find.
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Thursday, March 17th, 2011 AT 8:23 PM

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