Flushed both directions , only thing that came out was a little rust in
the water . No chunks or particles of any kind were flushed out - also
flushed the engine block , same result , some rusty coolant then clear .
Years ago, my Mom had similar problem. The mechanic
found a lot of leaves in the box with the heater core.
Some times the leaves would rise up, cover the fins
and block the air flow.
Is there a temp gage on the insturment cluster? Might
be thermostat sticking open. Did you check the temp at
the Tstat with a non contact thermometer while this
problem is occuring? I had to change the thermostat
on my newer vehicle.
On Friday, October 30, 2015 at 9:49:22 AM UTC-4, Stormin Mormon wrote:
Speaking of leaves, have you checked your cabin air filter recently?
Having bought 4 used cars in the past 3 years, I can attest to the fact
that the cabin air filter is a highly neglected item. Leaves, bees,
rocks (rocks?) and all manner of debris can be found embedded
in the cabin air filter.
One car I bought was so clean it practically glowed. The engine air
filter looked like it had been changed the day I test drove the vehicle.
After I bought it I pulled the cabin air filter. It was so dirty I'll
bet it was the original.
On Friday, October 30, 2015 at 10:22:47 AM UTC-4, Terry Coombs wrote:
My response wasn't to you, it was to Stormy. The cabin air filter will
not cause the problem you are describing. It was just a comment on the
neglect of the cabin air filters.
I believe that the 4Runner started to use cabin air filter in 2003, so
no, you don't have one.
When I replaced vehicle, I checked the main air filter. Pretty bad, so I
kept the one off the older vehicle. As to cabin air filter, I did ask at
a parts house, and they were unable to find any such listed.
Rock auto (dot com) also does not list such a part.
Good advice for all concerned. Thank you.
On Friday, October 30, 2015 at 10:26:43 AM UTC-4, Stormin Mormon wrote:
Here's an interesting factoid that most people will never need, but it
might make an interesting (not really) automotive trivia question:
How can you tell that the cabin air filter in a 1999-2004 Honda Odyssey
has *never* been changed?
I don't know if this is true for any other vehicles, but on the 2nd
generation Honda Odyssey, there is a plastic support bar that has to
literally be *cut* out of the vehicle in order to change the cabin air
filter the first time.
In order to keep the dash from flexing during installation at the factory,
there is a plastic support bar that connects the right hand side of the
dash to the center. The bar is only there to make it easier to install the
dash. However, once the dash is installed, this bar blocks access to the
panel that covers the cabin air filter housing.
The neatest way to remove the support is with a Dremel, but people have
used diagonal cutters, utility knifes, etc.
its best to run water both directions thru the heater core, and pulse compressed air thru the heater core at the same time, replacing all the coolant with plain water, then drain, and replace all the coolant with a 50 /50 mixture of NEW coolant
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