heater problems!!

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my wife has a yota highlander (05 with 100,000 miles) when she has the heater on and hits a bump in the road she says the heater starts blowin cold air, then she turns the heat off, then right back on, it starts blowin hot air again.....anyone have any ideas as to what could be the prob here....thanks guys !
 
LOL! trouble is, most of the NA built Toyotas, parts incl. electronics are sourced from NA suppliers (thus the 80+% NA content part).

Maybe those NA OE toyota parts supplier shall look into improving their quality, up to the Japanese standards (ref: Nippon Denso, Sumitomo, Mitsubishi, Hitachi, Japanese Stanley, Koito, etc.)

Mind you: I'm also having issues with poorly made NA supplied parts used in my wifey's Kentucky built Camry. Something that is due to sloppy Q/C that would not have happened if it's made in Japan (or if I'm to refer to my Suzuka built Honda fit).

Q.
 
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Rube Goldberg would be proud!! They should at a minimum have a little manual pull-rod under the dash that bypasses the electronics and gives you full heat through the defroster vents if all else fails.
 
i took my thermostat knob off and tighten it up, it was really loose. and the heater has been working fine so far. but i will keep you guys updated, thanks for the info !!
 
In my experience, and that of the forum I linked, eventully you'll have one of those wires break. In mine, I bought the car with 32,000 miles and the knob was loose. Tightened it up and it was fine until 48,000. I fixed it for about 25 cents worth of wire, tops. So maybe some lazy afternoon you might give this a second thought...

As for the reliability, I've been satisfied despite this problem. With any car, it's best to find a forum with people who know the problem and can help, not make armchair generalizations about the manufacuturer of you car.
 
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Quest, got news for you, even if the part is made in the USA, it's done to the home countries engineering standards. You just don't give an OE a part and say, "here ya go, hope it works"
 
c502,

My wifey's 04 camry comes with all sorts of smaller parts that are domestically sourced (e.g. power window switch, dome light plastic assembly, etc.) that rattles due to loose fit and finish and also generally of inferior quality if you are to compare to those of Japanese sourced OE parts supplier. Most major computer controlled components for these domestically-constructed cars are supplied by, of course, ND or similar which quality is assured.

And don't give me that "must meet manufacturer's design requirement/OE requirements tune" for I do see discrepancies between the 2, citing my neighbour's cali-built corolla with that dreadful Delco alternator that goes every 4yrs (he's already on his 2nd rebuilt replacement) while all other components are still in good shape.

Now my family owns 2 domestically-built imports (civic and camry) and a import (fit built in Suzuka, Jpn) and frankly, the domestic builts are only up to 70% of my expectations, while all others being equal.


Lastly, I don't have any good news for you for I ended up having to replace a switch in that dome light assembly (still loose) and ended up putting a dab of silicone RTV sealant to keep it from rattling loose (the original one was loose to begin with).

My 2c's worth. YOu don't have to agree with my armchair observations if you choose not to.

Q.
 
I have been selling to the OE's for years. Your perception that the US sourced parts are inferior is groundless. Everything they buy from an outside supplier, no matter where the country of origin, is tested by the OE engineers to the point of madness.
 
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