BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 another cooling system question

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soshoresig



Posts : 34
Join date : 2010-09-13

PostSubject: another cooling system question   Sun Feb 26, 2012 2:06 pm

So as I mentioned in my other post, the mechanical fan belt tensioner seized on the wifes RMW, which has reminded me that 6 months ago her secodary electric fan was running constantly and would not shut off at all. I pulled the relay from the under hood box and kind of forget about it. I think I was messing with the a/c when the fan started stayin on. Any ideas what I may have done?? thanks
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SPCS



Posts : 122
Join date : 2012-02-17
Age : 39
Location : Stuttgart, Germany

PostSubject: Re: another cooling system question   Sun Feb 26, 2012 2:23 pm

Not turned off the A/C maybe? Razz
A/C "On" is supposed to set off the cooling fans constantly, up to a certain speed, anyway.
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PostSubject: Re: another cooling system question   Sun Feb 26, 2012 3:33 pm

SPCS wrote:
Not turned off the A/C maybe? Razz
A/C "On" is supposed to set off the cooling fans constantly, up to a certain speed, anyway.
You are correct. I think after 45mph it shuts off. I would say the relay might be bad. I have never seen an LT1 overheat, and I never use A/C. The only way I have ever seen the secondary fan come on is when I force it too by unplugging the coolant temp sensor at the water pump.
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sdstick



Posts : 4282
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: another cooling system question   Sun Feb 26, 2012 4:14 pm

I pulled the mechanical fan right off the RMW.
No problems.
I didnt pull the bracket yet as I didnt have the shorter bolts available.
The secondary will cycle when sitting @ idle for extended periods of time.
Dont know if thats all or just mine.

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96BBB 28K 3.42 Bolt-ons
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95brmw



Posts : 1431
Join date : 2009-11-10
Age : 32
Location : Connecticut

PostSubject: Re: another cooling system question   Sun Feb 26, 2012 5:41 pm

Any CELs? certain ones will cause the fans to run constantly.
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soshoresig



Posts : 34
Join date : 2010-09-13

PostSubject: Re: another cooling system question   Sun Feb 26, 2012 9:16 pm

A/C is off ( it is February in New England after all) besides it doesnt work. I was playing with the freon, would an overpressure cond cause the fan to run constantly?
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SPCS



Posts : 122
Join date : 2012-02-17
Age : 39
Location : Stuttgart, Germany

PostSubject: Re: another cooling system question   Mon Feb 27, 2012 5:51 am

Yes. I'm not sure about the one mechanical / one eletrical setup, but the dual electrical fans will come on at 189 psi for the primary and 240 psi A/C head pressure for the secondary fan, and stay on until pressure has dropped below 150 adn 210 psi respectively.
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