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Overheating after new pump

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Overheating after new pump

  #1  
Old 04-14-2019, 01:57 PM
Chunx89
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Default Overheating after new pump

I have a 99 5.2 that needed a new water pump, the bearings were going bad and my fan had a lot if play in it. The truck has a 180 thermostat in it, and before the new water pump this thing stayed at 180, never moved at all. After the new pump which also came with the fan clutch, I bled all of the air out and now itís overheating. I am keeping the cap off and it has so much pressure in it that itís boiling and gushing out of the reservoir up to the sky a good 2 feet. Both rad hoses are too hot to touch, it will stay at 210 with the cap off but like I said, it will shoot out like a rocket. With the cap on it jumps up to 240 quick

im thinking I still have air in it, possibly pushing on the tstat and causing it not to open?
 

Last edited by Chunx89; 04-14-2019 at 02:15 PM.
  #2  
Old 04-14-2019, 02:31 PM
MoparFanatic21
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Originally Posted by Chunx89 View Post
I have a 99 5.2 that needed a new water pump, the bearings were going bad and my fan had a lot if play in it. The truck has a 180 thermostat in it, and before the new water pump this thing stayed at 180, never moved at all. After the new pump which also came with the fan clutch, I bled all of the air out and now itís overheating. I am keeping the cap off and it has so much pressure in it that itís boiling and gushing out of the reservoir up to the sky a good 2 feet. Both rad hoses are too hot to touch, it will stay at 210 with the cap off but like I said, it will shoot out like a rocket. With the cap on it jumps up to 240 quick

im thinking I still have air in it, possibly pushing on the tstat and causing it not to open?
You still do have air in it. A tip I found through the forums is park on a hill with the front of the vehicle facing up the hill. Ramps or jack stands will work also. Also next time drill a little hole in the thermostat that will help!
 
  #3  
Old 04-14-2019, 05:52 PM
Chunx89
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Originally Posted by MoparFanatic21 View Post
You still do have air in it. A tip I found through the forums is park on a hill with the front of the vehicle facing up the hill. Ramps or jack stands will work also. Also next time drill a little hole in the thermostat that will help!
i put it up on jack stands and still had no luck. Next Iíll drill two holes in the thermostat, thereís a crappy failsafe in there, should I just swap it out to a different one? Itís brand new though
 
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Old 04-14-2019, 06:29 PM
AtomicDog
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Be sure to use a quality thermostat in addition to ensuring no air is still in the system. I use Stant Superstats and haven't had an issue with them to-date.
 
  #5  
Old 04-14-2019, 06:48 PM
MoparFanatic21
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Originally Posted by Chunx89 View Post
i put it up on jack stands and still had no luck. Next Iíll drill two holes in the thermostat, thereís a crappy failsafe in there, should I just swap it out to a different one? Itís brand new though
Drill one hole, and you sure you got the right temp thermostat?
 
  #6  
Old 04-14-2019, 07:56 PM
Torxhead
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Drilling that hole in the thermostat does get the air out of the block after changing that thing. If it still runs hot, there could be an issue with a blockage in the block coolant flow or the fan clutch could be shot.
 
  #7  
Old 04-14-2019, 08:13 PM
Chunx89
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Originally Posted by MoparFanatic21 View Post
Drill one hole, and you sure you got the right temp thermostat?
just went out and put a new one itís a 195. drilled the one hole and itís holding at 210 but slowly climbs.

Originally Posted by Torxhead View Post
Drilling that hole in the thermostat does get the air out of the block after changing that thing. If it still runs hot, there could be an issue with a blockage in the block coolant flow or the fan clutch could be shot.
brand new fan clutch and water pump, donít know what else it could be. Only thing is air in the system, but it seems to me that the pump isnít working. My radiator is too hot to touch. The coolant in the radiator is steaming when i am waiting to burp the air out. This things holds its temp until I put the radiator cap back on. Iím stumped here.
 
  #8  
Old 04-14-2019, 08:20 PM
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Skip the safety stat. They suck. (and tend to fail rather quickly) Just get a stant thermostat, drill a hole in it, and call it a day.
 
  #9  
Old 04-14-2019, 08:37 PM
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Originally Posted by HeyYou View Post
Skip the safety stat. They suck. (and tend to fail rather quickly) Just get a stant thermostat, drill a hole in it, and call it a day.
Thats what I did, and still no luck!
 
  #10  
Old 04-14-2019, 09:03 PM
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Try burping it again. Radiator cap off, let the thermostat cycle a couple times. See what happens.
 

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