Suspect water pump

Dreadnaught · 06-18-2017, 10:29 AM

Quote:

Originally Posted by fryzia23

No it isn't, but usually when the bearing goes it'll make noise. And it's more like a gurgle not whining. I never said always btw

I know lol.

What do you work on at your shop? A little bit of everything?

Dreadnaught · 06-18-2017, 10:35 AM

Quote:

Originally Posted by SouthArk370Z

Sounds like it may have been run without antifreeze.

You may have some of the same scaling on the pump impeller fins and/or water passages, reducing pump output and flow through the system.

This. Sounds like it's also due to poor maintenance by the previous owner like the OP stated.

SouthArk370Z · 06-18-2017, 10:57 AM

Quote:

Originally Posted by Z_ealot

That was my thinking right there too, i ran a bottle of the prestone super flush cleaner through the system for a few days before i swapped out the radiator and did get a pretty good chunk of white powdery stuff that ended up inthe overflow reservoir if that tells you anything

That chunk may have been part of the impeller. I'd plan on replacing the pump and doing a very close inspection of the entire cooling system. If the corrosion is bad enough to eat the impeller, no telling what other damage has been done and what has been plugged up.

Z_ealot · 06-18-2017, 11:03 AM

Quote:

Originally Posted by SouthArk370Z

That chunk may have been part of the impeller. I'd plan on replacing the pump and doing a very close inspection of the entire cooling system. If the corrosion is bad enough to eat the impeller, no telling what other damage has been done and what has been plugged up.

The whole reason i swapped out the radiator was that i was having the exact problem im having now with the system only overheating at idle with the ac on. You think running some more cleaner through the system would help or should i plan on replacing the water pump and then run cleaner through it afterward?

SouthArk370Z · 06-18-2017, 12:40 PM

Quote:

Originally Posted by Z_ealot

The whole reason i swapped out the radiator was that i was having the exact problem im having now with the system only overheating at idle with the ac on. You think running some more cleaner through the system would help or should i plan on replacing the water pump and then run cleaner through it afterward?

I don't think using harsh chemicals is the answer. I would consider it, at best, a temporary band-aid that may do more damage than good. But you may not have much choice at this point. YMMV

I'd do an inspection of the block (you may be able to use one of the cheap borescopes/endoscopes that you can find online nowadays) for corrosion before going too far.

Z_ealot · 06-18-2017, 12:48 PM

Quote:

Originally Posted by SouthArk370Z

I don't think using harsh chemicals is the answer. I would consider it, at best, a temporary band-aid that may do more damage than good. But you may not have much choice at this point. YMMV

I'd do an inspection of the block (you may be able to use one of the cheap borescopes/endoscopes that you can find online nowadays) for corrosion before going too far.

I do have a borescope so i guess I'll have to get that in there, one thing to note though....this whole saga started a couple of months after i had the dealer do a coolant flush. The coolant that was in there beforehand i have no idea how long it was in there but it was still green in color. Before that i had no problems for the close to a year i had the car before i had them flush the system.

Rusty · 06-18-2017, 01:29 PM

IMO a coolant flush, tranny flush are the worse 2 things you can do to a car. I've hardly ever heard a good thing about them It's mostly always been a horror story. Your's is just another one on the list of reasons why not to do it. The bottom half of your radiator could be plugged from the scaling that got knocked loose/dissolved from the chemicals they used for the flush.

Spooler · 06-18-2017, 01:36 PM

If your issue is only at idle you need to look at the radiator fans. Make sure they are kicking up to high speed at idle and they are both working. You could test these with Nissans Consult. Not sure how you would do it without the Consult tool. Uprev or Ecutek may be able to do it.

I am going to ask a silly question. Did you remove the bleed screw out of the radiator when filling with antifreeze?

SouthArk370Z · 06-18-2017, 01:37 PM

Quote:

Originally Posted by Rusty

IMO a coolant flush, tranny flush are the worse 2 things you can do to a car. I've hardly ever heard a good thing about them It's mostly always been a horror story. Your's is just another one on the list of reasons why not to do it.

Chemical flushes worked when engines were made of iron but anything strong enough to eat the corrosion is strong enough to eat aluminum.

Quote:

Originally Posted by Rusty

The bottom half of your radiator could be plugged from the scaling that got knocked loose/dissolved from the chemicals they used for the flush.

Very likely. And any other small passages.

SouthArk370Z · 06-18-2017, 01:42 PM

Quote:

Originally Posted by Spooler

If your issue is only at idle you need to look at the radiator fans. Make sure they are kicking up to high speed at idle and they are both working. You could test these with Nissans Consult. Not sure how you would do it without the Consult tool. Uprev or Ecutek may be able to do it.

Definitely worth checking before taking more drastic measures.

A non-contact tachometer will tell how fast the fans are spinning (may be able to borrow one at a parts store). Not sure how fast they are supposed to turn but that info may be in FSM. Or compare to another Z.

Z_ealot · 06-18-2017, 02:04 PM

Quote:

Originally Posted by Spooler

If your issue is only at idle you need to look at the radiator fans. Make sure they are kicking up to high speed at idle and they are both working. You could test these with Nissans Consult. Not sure how you would do it without the Consult tool. Uprev or Ecutek may be able to do it.

I am going to ask a silly question. Did you remove the bleed screw out of the radiator when filling with antifreeze?

Have checked this multiple times and both kick on high speed when the coolant temp hits about 214

Z_ealot · 06-18-2017, 02:08 PM

Quote:

Originally Posted by Rusty

IMO a coolant flush, tranny flush are the worse 2 things you can do to a car. I've hardly ever heard a good thing about them It's mostly always been a horror story. Your's is just another one on the list of reasons why not to do it. The bottom half of your radiator could be plugged from the scaling that got knocked loose/dissolved from the chemicals they used for the flush.

Flush was done before i swapped out the radiator and rest of system was filled and drained multiple times with distilled water to clear the system of the cleaner. Only thing that i didnt do is backflush the system with the thermostat off

Spooler · 06-18-2017, 02:45 PM

Sounds like you are done and need to take it to someone with more knowledge than you. Just sayin.

Z_ealot · 06-18-2017, 02:58 PM

Quote:

Originally Posted by Spooler

Sounds like you are done and need to take it to someone with more knowledge than you. Just sayin.

Took it to a shop, they are the ones that suggested to swap the radiator and if that didnt work they suggested to do the water pump next

SouthArk370Z · 06-18-2017, 04:46 PM

Quote:

Originally Posted by Z_ealot

Took it to a shop, they are the ones that suggested to swap the radiator and if that didnt work they suggested to do the water pump next

They should be able to check the radiator before deciding whether or not to replace. Same with the pump.

If the radiator is plugged with sludge, the block probably has some sludge buildup too.

I'm still not 100% sure that corrosion/sludge is the problem (although it sounds like the top candidate). If it were me, I'd inspect the radiator and pump before I started replacing parts. I'd do whichever was easiest first. You should be able to get a good idea of radiator condition by pulling the inlet hose and using your borescope.

06-18-2017, 01:29 PM	#22 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 35,186 Drives: 2011 Nismo GM 6M Rep Power: 2684437	IMO a coolant flush, tranny flush are the worse 2 things you can do to a car. I've hardly ever heard a good thing about them It's mostly always been a horror story. Your's is just another one on the list of reasons why not to do it. The bottom half of your radiator could be plugged from the scaling that got knocked loose/dissolved from the chemicals they used for the flush. Z_ealot and SouthArk370Z like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

06-18-2017, 01:36 PM	#23 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,800 Drives: 2013 Nismo 370z Rep Power: 2684392	If your issue is only at idle you need to look at the radiator fans. Make sure they are kicking up to high speed at idle and they are both working. You could test these with Nissans Consult. Not sure how you would do it without the Consult tool. Uprev or Ecutek may be able to do it. I am going to ask a silly question. Did you remove the bleed screw out of the radiator when filling with antifreeze? SouthArk370Z likes this. Last edited by Spooler; 06-18-2017 at 01:42 PM.

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06-18-2017, 02:45 PM	#28 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,800 Drives: 2013 Nismo 370z Rep Power: 2684392	Sounds like you are done and need to take it to someone with more knowledge than you. Just sayin.