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Chevy Blazer transfer case
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karjo25
New User
Dec 31, 2005, 11:30 AM
Post #1 of 6
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Chevy Blazer transfer case
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Took my 2000 Blazer in for service for lack of heat on floor (works fine on dash & windshield).
I am told that I need to replace mode door, actuator, and a transfer case switch. They told me not to use my 4WD until it is fixed. How serious is this?
Should I get a second opinion? Its not a cheap repair.
Previous msgs lead me to believe heater problems are not uncommon on S10 Blazers. Perhaps I should considering trading it.
Thanks, KJ
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 31, 2005, 12:54 PM
Post #2 of 6
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2000 Blazer Heater Problem
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Get a second opinion!! The heater box with its diverter doors can be a real pest to fix and I'm guilty of NOT knowing how hard a 2000 is to get at. Most of the time it's just a vacuum leak which is under the hood which will cause defrost mode only. A shop that specializes in MVAC (Motor Vehicle Air Conditioning) would be great - there are none I know of where I live with a short season for A/C. I would think about whether this is a good reason to trade in the vehicle as I don't think it's that hard to fix - but I don't have it in front of me either. Good luck whatever you do and Happy New Year, - T
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karjo25
New User
Dec 31, 2005, 1:26 PM
Post #3 of 6
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Re: 2000 Blazer Heater Problem
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Thanks Tom -
are all 3 repair parts related for the symptoms? (mode door, actuator, transfer case switch)
--short A/C season here too -- Rochester NY
Thanks again
Karen
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Dec 31, 2005, 7:37 PM
Post #4 of 6
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Re: 2000 Blazer Heater Problem
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I still think this is a problem with the source of vacuum that makes these things work. I don't know why you were told not to use 4WD as the worst that would happen is that it wouldn't engage.
The heater box (a plastic moulded thing mostly on passenger's side lower) has the diverter doors (flaps) that direct air flow to where you want it and are almost all vacuum (from engine) operated. With or without A/C it's the same type of thing. The "home" position when vacuum is missing for control is defrost mode. 99% of those are a hose or fitting broken under the hood. That MUST be ruled out first! I could be wrong but I haven't seen ANY heater box problems in GM vehicles short of perhaps a collision as the cause. Some vehicles have cronic problems with this stuff but don't think it's yours.
If you are near Clinton, NY -- I might be able to get you some good help from a shop there if needed, - T
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karjo25
New User
Jan 1, 2006, 2:14 PM
Post #5 of 6
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Re: 2000 Blazer Heater Problem
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Thanks Tom -
I promise not to bother you again with this - as I so appreciate your feedback and don't want to take advantage of your time.
The reason the dealer/service dept said not to use 4WD was that fluid from the 4WD is finding itself into a place it shouldn't be -- probably the vacuum line. (He told me, but I forgot exactly.)
TA
Karen
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 2, 2006, 8:59 AM
Post #6 of 6
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Re: 2000 Blazer Heater Problem
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Karen,
It's no bother! I still think you need a second opinion with this. The vacuum to operate 4WD may be able to pick up some gear oil but I've NEVER seen that. Some old regular automatic transmissions could do that but you could see that from a mile away with a grayish smoke billowing out the exhaust that wouldn't quit - no just what you see starting up on a cold day.
You are as welcome here as can be. Come back and tell us all what fixed the trouble so many others can check there if it happens to them. Hope your Holidays went well, - T
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