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| Is it the oil pump I hear running? (Page 3/3) |
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Cliff Pennock
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DEC 13, 07:09 AM
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| quote | Originally posted by buddycraigg:
Show me the whole page please. |
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That was posted by fierosound. I thought this came from the service manual, but I can't find that page in mine. Well, not in the digital version. I'll have to look for my own service manual and see if I can find the page there
| quote | | That has nothing to do with your engine coolant temperature. |
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No, but they are controlled by the same sensor. So one shouldn't run without the other.
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Cliff Pennock
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DEC 13, 07:14 AM
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| quote | Originally posted by theogre:
Is very likely diagram is wrong w/ resistor. |
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The above diagram was posted by fierosound and it apparently came from a different version of the service manual than I have since I can't find that page in mine. However, in my service manual, I see similar depictions of the fan relay - all showing a resistor instead of a diode.
That said, a diode makes sense, a resistor doesn't. But I can't see why they would have the same error across different versions of the service manual...
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theogre
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DEC 13, 09:48 AM
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"Authors"/"editors" of FSM copy/past as much data as possible even from other model lines & often doesn't check the data is True. Example: The entire 84-86 FSM rear brake sections for Fiero has huge problems not corrected even in TSB until rework that section for 87 Fiero FSM
Many errors "upstream" cause by drafters etc that don't look very hard @ wire diagrams & other "pictures"/drawings they output to nearly everyone else.
Alldata unlike most others have exact same data & errors in GM & other FSM because paid a huge fee for Licensing.
IOW alldata shows same resistor there for 86 & likely other years.
I don't have a spare rad fan relay handy to take apart to check how it made. Pain in the ass to look @ one in the car.
Side note: Many Trust P22 & related parts books to get GM PN but they have problems too & why all "books" list wrong rad cap until someone got lucky to get Stant to correct that number to non-vent cap. Other "books" including Motorad still list the vented cap to match wrong number in P22.
Engine blower relay & motor runs off E-fan fuse. (E-fan to Brn wire to 2 pins on relay)
Rad fan... the coil is wire to E-fan fuse but gets Power directly from Fuse Link A 24/7
& Both can Turn On w/o warning like turn i-key to run & have AC/Heat control head set to AC.
In fact... make sure the control head is Off, Vent or Heat settings. (Defog runs AC to when weather is warm enough & may try to run the rad fad & engine blower even tho "books" say doesn't run them.) Why? Is possible this is set to AC, engine blower is On as normal but have wiring or other problems to the Rad Fan & Fails to turn On.
Both should be On @ same time but if one Fails the other can be On or Off depending exact problem.
Also AC high limit can run them too in V6. Not just coolant temp or ac control head.
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fierogt28
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DEC 17, 11:39 PM
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Bottom line here is the radiator fan and rear coil and alternator air blower comes on at the same time.
The reason for this is the old alternator design with the disc fan.
The 88V6 models had the steel fan design on the alternator.
It was strange that ignition coil didn’t need the blower tube on the 88GT and Formula, probably because GM did testing that it wasn’t necessary. But the 88V6 had a rear manifold shield to deal with heat.
The 85-87V6 had a different shield (on original cars) on the alternator.
I would recommend that the 88V6 manifold shield be used because less heat, is better, even though some will say they never had an alternator failure without this 88V6 specific shield. ------------------
fierogt28
88 GT, Loaded, 5-speed.
88 GT, 5-speed. Beechwood interior, All original.
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Patrick
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DEC 18, 12:01 AM
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| quote | Originally posted by fierogt28:
It was strange that ignition coil didn’t need the blower tube on the 88GT and Formula...
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I believe that was because the exhaust Y-pipe on the '88 2.8 was vastly superior to the '85-'87 design in regards to how well it kept heat away from the ignition coil and ICM.
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fierogt28
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DEC 18, 12:10 AM
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Patrick, that is true. The 88V6 had the improve / added heat shielding on all the “Y” pipe and up to the manifolds.
That indeed was a better setup.
I always preferred / liked that heat shielding because it looks more exotic than just tin shields that could bend and could cause vibration if it would touch something.
That 88 type shielding is still used today.
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fierogt28
88 GT, Loaded, 5-speed.
88 GT, 5-speed. Beechwood interior, All original.
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