thejum57 Posted December 20, 2016 Share Posted December 20, 2016 I replaced the water pump in my 86, 2.5L Comanche. It was screeching, and groaning. Only one heater hose and lower radiator hose to remove, simple replace. Fired it up, added some antifreeze....SO much came out...a whole other story. Then the overheating Idiot light came on???? It was only running for 5 minutes?, I opened the radiator cap......not a good idea, I know better. Parked it, fired it up after work today, same deal. All the hoses are new. WTF ???? I thought I was HELPING it ! Link to comment Share on other sites More sharing options...
Strokermjcomanche Posted December 20, 2016 Share Posted December 20, 2016 Make sure you don't have an air pocket . Then make sure the water pump is the correct rotation and the belt is routed properly Link to comment Share on other sites More sharing options...
thejum57 Posted December 20, 2016 Author Share Posted December 20, 2016 How would I know if I have an air pocket, and how would I fix that? It is a "v" belt pump, not a serpentine. From what I saw ordering the pump, the Serpentine rotates the opposite way of the V belt . Link to comment Share on other sites More sharing options...
MJCARENA Posted December 20, 2016 Share Posted December 20, 2016 Did you put in as much coolant as came out ? Like mentioned above, you probably have an air pocket. Link to comment Share on other sites More sharing options...
desbennett004 Posted December 20, 2016 Share Posted December 20, 2016 The impeller should have been stamped with an "R", I believe you can buy the same pump with 2 different impellers, depending on belt routing and rotation. Sent from my SM-N900W8 using Tapatalk Link to comment Share on other sites More sharing options...
johnj92131 Posted December 20, 2016 Share Posted December 20, 2016 Don't forget to turn on the heater as you fill the radiator. Otherwise, the heater core can trap a whole bunch of air. Ask me how I know. Also have to wonder if you blew the head gasket from overheating the engine with the bad water pump. BUT start with the simple things first. DID you change the thermostat when you did the water pump? Link to comment Share on other sites More sharing options...
desbennett004 Posted December 20, 2016 Share Posted December 20, 2016 I keep squeezing the top radiator hose with the rad cap off and the engine running to try pump out any air. Sent from my SM-N900W8 using Tapatalk Link to comment Share on other sites More sharing options...
Eagle Posted December 20, 2016 Share Posted December 20, 2016 The impeller should have been stamped with an "R", I believe you can buy the same pump with 2 different impellers, depending on belt routing and rotation. Sent from my SM-N900W8 using Tapatalk You wrote that you have a 2.5L. Do you have a serpentine belt, or conventional V- belts? If you have V-belts, you need a water pump with "forward" rotation. If you have a serpentine belt, you need a water pump with reverse rotation. They share a housing and bolt pattern, because both can go on the same engine. You'll need to verify which pump you got. Link to comment Share on other sites More sharing options...
1989 comanche mj Posted December 20, 2016 Share Posted December 20, 2016 Figure out the rotation of the water pump by looking at the old one. Also, never add coolant after completing a cooling system repair. Just use water until you know everything is ok. I have wasted lots of the stuff this way. I also check the thermostat by taking it out and dunking it in boiling water. They don't always work, even when new. Link to comment Share on other sites More sharing options...
HOrnbrod Posted December 20, 2016 Share Posted December 20, 2016 You wrote that you have a 2.5L. Do you have a serpentine belt, or conventional V- belts? If you have V-belts, you need a water pump with "forward" rotation. If you have a serpentine belt, you need a water pump with reverse rotation. They share a housing and bolt pattern, because both can go on the same engine. You'll need to verify which pump you got. ^^ This. http://www.jeepforum.com/forum/f12/waterpump-tutorial-893428/ Link to comment Share on other sites More sharing options...
A-man930 Posted December 23, 2016 Share Posted December 23, 2016 When it comes to bleeding can you do the gauge sending unit trick on 2.5s same as 4.0s? Link to comment Share on other sites More sharing options...
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