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Old 01-01-2023, 01:41 PM #1
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No coolant flow to brand new heater core

Hello everyone, long time first time. Starting a thread is usually my last resort, and well here I am.

Battling a no heat issue on my 1998 Limited V6 2WD. More specifically, I'll occasionally get some lukewarm heat, but after running the fan for half a minute or so it'll go cold.

Background:
  • Coolant gage always sits barely below the middle
  • Scanner says coolant is reaching ~188F
  • The heat has never worked since I've owned it
  • The tees that go to/from the rear heater have been plugged

Attempts to solve:
  • Brand new Spectra heater core
  • Verified blend doors are working correctly
  • Verified heater valve was working
  • Bypassed heater valve
  • New OEM thermostat
  • 5-10 system bleeds
  • New Radiator Cap
  • Back flushed new heater core
  • Back flushed engine/radiator

Here's the interesting thing. I replaced a section of hose before the heater valve with clear tubing and saw that with the truck running, the coolant is just sitting there; virtually no flow into the heater core.

Also, the system is not building pressure. After running and getting up to operating temp, you can pull the radiator cap off (even the new one) with no problem.

Am I missing anything? I'm pulling my hair out.
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Old 01-01-2023, 02:20 PM #2
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No mention of water pump.
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Old 01-01-2023, 03:16 PM #3
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My logic is that if the water pump wasn’t working correctly, it would be overheating. This thing has never even thought about overheating as long as i’ve had it, even with AC on full bast in the summer.


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Old 01-01-2023, 03:28 PM #4
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no flow, no pump. no pressure, no pump. pump time.
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Old 01-01-2023, 05:09 PM #5
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I agree it's not the pump if it's not overheating.
It's not the pump that builds the pressure it's the coolant temp.
It's a circulating pump, not a pressure pump.
Do you know anyone with a 4runner or Pickup with the same motor so you could compare hose routing?
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Last edited by alumarine; 01-01-2023 at 05:11 PM.
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Old 01-02-2023, 12:10 AM #6
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Quote:
Originally Posted by alumarine View Post
I agree it's not the pump if it's not overheating.
It's not the pump that builds the pressure it's the coolant temp.
It's a circulating pump, not a pressure pump.
Do you know anyone with a 4runner or Pickup with the same motor so you could compare hose routing?
I concur: Look at the hose routing.
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Old 01-02-2023, 05:24 PM #7
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The pipe under the intake may be clogged. You could remove the Rad cap and blow some compressed air through it.


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Old 01-02-2023, 06:49 PM #8
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Thanks everyone. I have a ‘98 FSM on the way that I will use to confirm hose routing. I believe the heater core outlet goes to the line underneath the intake - can someone confirm?

To rule out air in the heater core (and confirm no system leaks) I have a cooling system vacuum refill kit on the way too.


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Old 01-02-2023, 06:52 PM #9
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Here's a coolant flow diagram for the 5VZ-FE.
Attached Images
No coolant flow to brand new heater core-coolant-flow-2-jpg 
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Old 01-02-2023, 08:51 PM #10
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Note: The above diagram shows an EGR valve, which does not exist on our 4Runners.
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Old 01-02-2023, 09:21 PM #11
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Quote:
Originally Posted by rcvxl24 View Post
Thanks everyone. I have a ‘98 FSM on the way that I will use to confirm hose routing. I believe the heater core outlet goes to the line underneath the intake - can someone confirm?

To rule out air in the heater core (and confirm no system leaks) I have a cooling system vacuum refill kit on the way too.


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With nothing wrong and a good Rad Cap all you should need to do is fill the Rad to the top and ensure the expansion tank is filled to the top mark and heat cycling the engine around three times does the rest.

With a cold engine, if you remove your Rad cap is coolant touching the cap?


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Old 01-03-2023, 04:31 PM #12
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Quote:
Originally Posted by pluton View Post
Note: The above diagram shows an EGR valve, which does not exist on our 4Runners.
Yes with an * that's sure not a diagram of a 4 cylinder that's a v6 so in some parts of the world maybe the EGR is there just not in the us and canada market. :-)
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Old 01-03-2023, 05:36 PM #13
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Quote:
Originally Posted by brillo_76 View Post
Yes with an * that's sure not a diagram of a 4 cylinder that's a v6 so in some parts of the world maybe the EGR is there just not in the us and canada market. :-)
I believe you're right.
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Old 01-03-2023, 07:10 PM #14
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Are you 100% sure the heater valve is working? I don't mean the cable is moving, can you confirm that your heater valve is not just sealed shut and broken? They break pretty easy - every time I've taken off a heater line off the valve it has broken on me. That would be the only thing making sense that would stop coolant flow in its tracks but not block flow in the engine. By the way, I can also take my radiator cap off when it's 'warmed up' after 5-10 minutes. I CANNOT take it off when it's actually hot after driving for say, 20 minutes or more as it sprays out like a fountain. Yes I've done it by accident.
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Old 01-03-2023, 08:25 PM #15
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Quote:
Originally Posted by alumarine View Post
I believe you're right.
Sometimes I am... and when I am not, the other members correct me..
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