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  #1  
Old 11-16-2014, 10:41 PM
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Rzeppa Rzeppa is offline
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Default 3rd Gen Runner Heat

My stepdaughter's 98 runner reportedly has very little heat coming out of the vents. It is a relatively new car to her so we don't have much of a baseline. I know Land Cruisers and earlier runners, but not later ones.

She is going to bring it up for me to take a look at on Tuesday, and I would like to have some collective knowledge to know what to look for.

Where is the heater valve located? On mid-year Land Cruisers (1974-1990 ish) it will be on the top of the engine side of the firewall on the passenger side.

Where is the T-stat located on a 5VZ-FE?

Anybody here replace a heater core on a 3rd Gen runner? How much stuff do you have to pull to get at it? Any gotchas'?

TIA!
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Old 11-16-2014, 11:06 PM
4runner 4runner is offline
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Not sure if these will help.

http://www.toyota-4runner.org/3rd-ge...bout-heat.html

http://www.toyota-4runner.org/3rd-ge...-yes-back.html
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  #3  
Old 11-17-2014, 09:37 AM
SteveH SteveH is offline
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If replacing the 3rd gen heater core is anything like replacing a 1st gen heater core, be prepared for the worst. Like 9 hours of dashboard teardown/reassemble. I can't imagine a 3rd gen would be easier.

Jeff - as you likely know, compare the inlet and outlet temps of the hoses going to/from the heater core, with the fan on high, to see how much heat the core is rejected. You sure don't want to replace a heater core that isn't clogged. As the links alluded to, check all the duct flappers, valves, t-stat, etc. The t-stat is under the upper timing cover, IIRC, and not too bad to get to. I believe the heater valve is where you indicated - high on the firewall - cable operated - pretty obvious.

My 3rd gen heater will bake you right out, so if it's operating correctly, you should have no doubts.
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Old 11-17-2014, 09:59 AM
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Rzeppa Rzeppa is offline
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Thanks Steve, that's helpful and pretty much what I expected. After reading the threads from the links above, the 2 things that stuck out were that they have a rear heater, and it can be helpful to check and see if it's putting out much heat, and that the flapper (mixing flap) can be the culprit. I am hoping for a stuck-partially-closed heater valve. I've done a few cores on newer (post-1970s) vehicles and like you said, it's a ton of work to get to them.
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Old 11-18-2014, 04:10 PM
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Jeff, depending on the maintenance of the vehicle, it may just be low on coolant...Has that been checked?
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Old 11-19-2014, 09:27 AM
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I finally got a chance to go over the runner in person yesterday. I could find nothing wrong. I operated the valve fully open/closed a couple cycles. There seemed to be plenty of heat coming out. After I explained what I found to my stepdaughter, she got in and was astonished at how much heat was coming out. Best guess it that the valve had some crud caught in it and cycling it a couple times helped improve flow through it. Since it is at about the highest point in the cooling system, it might be a place to have minerals or something precipitate out. They use red coolant. Thanks for all the help guys!
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Old 11-19-2014, 09:56 AM
SteveH SteveH is offline
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Excellent - the best middle-of-the-winter vehicle fix is one that is incredibly simple.
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Old 11-19-2014, 10:20 AM
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Rzeppa Rzeppa is offline
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Quote:
Originally Posted by SteveH View Post
Excellent - the best middle-of-the-winter vehicle fix is one that is incredibly simple.
No kidding! It was flippin' cold out there yesterday!
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