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new water pump instant overheating


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So... Just had my water pump fail and installed a new one. Bled the cooling system as instructed on the various treads on this forum. No luck. As soon as it runs for a few minutes it overheates. Can the waterpump be bad?!  Did not replace the thermostat but will if I'm back under there. Any suggestions are welcome thanks. 

 

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6 hours ago, florida miles said:

So... Just had my water pump fail and installed a new one. Bled the cooling system as instructed on the various treads on this forum. No luck. As soon as it runs for a few minutes it overheates. Can the waterpump be bad?!  Did not replace the thermostat but will if I'm back under there. Any suggestions are welcome thanks. 

 

Have you filled the circuit with a vacuum device? Without a tool it is very difficult to get all air pockets out of the circuit. New water pump faillures are rare but not impossible, the rotor sometimes does sit loose on the shaft, but i'm guessing on air pockets.

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No the vacuum device is something that I dont have in the tool box. Looks like I may need to find one!  I feel as though you are correct and there is just some trapped air in the system. After all there is quite a bit of piping as opposed to a front mounted engine. Thanks. I'll try the vacuum and let you know.

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21 minutes ago, florida miles said:

No the vacuum device is something that I dont have in the tool box. Looks like I may need to find one!  I feel as though you are correct and there is just some trapped air in the system. After all there is quite a bit of piping as opposed to a front mounted engine. Thanks. I'll try the vacuum and let you know.

 

Amazon sells the Airlift system, which is what the dealers use.

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I purchase Airlift form Amazon (~$135) and tried on my 02 boxster but it was not holding the vacuum. So I called a tech he came with pressure tester and tested with 1.3 bar and that was holding. So he said not to pay too much emphasis on the vacuum. I had noticed mine getting heating up as well ~close to 200. So cleaned the radiators yesterday. I air lock as the culprit.   I feel that burping is not enough. I was going over the Bentley manual they have couple of steps that I did't to like rev at 2500 for 5 mins and rev at 5000 for 5 mins. etc.. Which I didn't do it. Now I am back to square one. 

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1 hour ago, RKPorsche said:

I purchase Airlift form Amazon (~$135) and tried on my 02 boxster but it was not holding the vacuum. So I called a tech he came with pressure tester and tested with 1.3 bar and that was holding. So he said not to pay too much emphasis on the vacuum. I had noticed mine getting heating up as well ~close to 200. So cleaned the radiators yesterday. I air lock as the culprit.   I feel that burping is not enough. I was going over the Bentley manual they have couple of steps that I did't to like rev at 2500 for 5 mins and rev at 5000 for 5 mins. etc.. Which I didn't do it. Now I am back to square one. 

 

It makes absolutely no sense that the car can't hold vacuum but can hold pressure.   The vacuum system is the standard method of filling the cooling system without trapping air pockets, and is used by dealers and shops across the world.

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  • 4 weeks later...

Replaced bleeder o-rings and tested  vacuuming again up to 20psi. And it started to leak vacuum and I could hear water making noise inside the pipes. I kind of traced that noise to LH radiator hose. I suspect the LH radiator has a minor leak, that did not show up when pressure tested. So to confirm my assumption I am trying to seal off the radiator hoses at the LH radiator and try to see if it retains the vacuum. Is there a better idea ?

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  • 2 weeks later...

Thanks JFP. Found the vacuum leak, when I not connect the heater core pipes (2 metal pipes) under the rear passenger side wheel, I don't see vacuum drop. I had to plug hose from engine and return to split hose to isolate that line. So I am chasing the the heater core, I just posted a new issue for that.

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  • 3 weeks later...
Thanks JFP. Found the vacuum leak, when I not connect the heater core pipes (2 metal pipes) under the rear passenger side wheel, I don't see vacuum drop. I had to plug hose from engine and return to split hose to isolate that line. So I am chasing the the heater core, I just posted a new issue for that.

Issue was with heatercore replaced it with one from eBay and that resolved vacuum leak issue


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