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 it’s overheating. I am keeping the cap off and it has so much pressure in it that it’s 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? |
Originally Posted by Chunx89
(Post 3435453)
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 it’s overheating. I am keeping the cap off and it has so much pressure in it that it’s 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? |
Originally Posted by MoparFanatic21
(Post 3435460)
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!
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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.
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Originally Posted by Chunx89
(Post 3435477)
i put it up on jack stands and still had no luck. Next I’ll drill two holes in the thermostat, there’s a crappy failsafe in there, should I just swap it out to a different one? It’s brand new though
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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.
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Originally Posted by MoparFanatic21
(Post 3435489)
Drill one hole, and you sure you got the right temp thermostat?
Originally Posted by Torxhead
(Post 3435500)
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.
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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.
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Originally Posted by HeyYou
(Post 3435503)
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.
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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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