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| Is it the oil pump I hear running? (Page 2/3) |
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Cliff Pennock
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DEC 01, 02:35 AM
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| quote | Originally posted by buddycraigg:
You're coolant issues are wearing me slick. |
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Same.
It feels like I fix on issue, and another one pops up.
| quote | | Is your radiator fan coming on? |
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It has sometimes. Since I replaced the radiator, it hasn't come on as often as it used to. In fact, it hasn't come on since (outside) temperatures dropped drastically to around 40*F. And looking at engine temps, it isn't surprising at all the fan doesn't come on. The gauge says temps are between 175*F - 195*F. So I'm not sure why the engine bay fan *does* come on.
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Raydar
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DEC 01, 07:01 PM
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| quote | Originally posted by Cliff Pennock:
It has sometimes. Since I replaced the radiator, it hasn't come on as often as it used to. In fact, it hasn't come on since (outside) temperatures dropped drastically to around 40*F. And looking at engine temps, it isn't surprising at all the fan doesn't come on. The gauge says temps are between 175*F - 195*F. So I'm not sure why the engine bay fan *does* come on.
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Does your car have A/C? The fans - both of them - are supposed to come on whenever the A/C is energized, except when it's in "defrost".
Can't imagine why one would run without the other, though.
If your car does not have A/C, then the fans (AFAIK) are only controlled by the sender, near the thermostat.[This message has been edited by Raydar (edited 12-01-2023).]
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Patrick
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DEC 01, 07:17 PM
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| quote | Originally posted by Raydar:
The fans - both of them - are supposed to come on whenever the A/C is energized, except when it's in "defrost".
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Really?  I didn't know that. I thought the rad fan and trunk blower were always synced to come on together, no matter whether it was the fan switch (on the engine) or HVAC/defrost that triggered them. Learn something new every day![This message has been edited by Patrick (edited 12-01-2023).]
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fierosound
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DEC 02, 11:32 AM
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Cliff Pennock
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DEC 02, 12:34 PM
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| quote | Originally posted by fierosound:
Check the relay.
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It isn't on always. Only when the engine is at operating temperature. But like I said, at operating temperature, temperatures aren't high enough for the radiator fan to come on. Yet the engine bay fan does come on. I have no idea what triggers it.
I have no A/C BTW.
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Cliff Pennock
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DEC 02, 12:49 PM
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Why is the coolant fan relay different from the engine blower relay?
It looks like there's an extra resistor parallel to the relay. Why?
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buddycraigg
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DEC 12, 10:33 PM
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| quote | Originally posted by Cliff Pennock:
Why is the coolant fan relay different from the engine blower relay?
It looks like there's an extra resistor parallel to the relay. Why? |
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Show me the whole page please.
And this is starting to nudge my memory.
The trunk fan is supposed to keep the coil/distributor and (I think) alternator cool.
That has nothing to do with your engine coolant temperature.
Funny side story. A lot of those were wired backwards, so the fan sucked instead of blowing.
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theogre
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DEC 12, 11:16 PM
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| quote | Originally posted by Cliff Pennock:
Why is the coolant fan relay different from the engine blower relay?
It looks like there's an extra resistor parallel to the relay. Why? |
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Is very likely diagram is wrong w/ resistor.
Most, not all, car relays have a Diode on the coil as "surge protection" when coil is turn Off.
Many diagrams don't have the Diode but actual parts do have them. Some maybe hidden in the coil.
Sometimes you can test them w/ Ω meter w/ coil resistance changes for which way the probe are used.
Maybe correct using a resistor instead for same reason.
Gen2 HL module has resistors across motor control pins for this reason but unlike diode, in this case power gets reverse & need something that won't notice.
Physically the relays are way different & no work.
If blower relay is bad & can't get now, just get same relay & pigtail plug as F-pump. The "standard" relay used by many things I think handles 20A @ "12v" DC.
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theogre
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DEC 12, 11:22 PM
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| quote | Originally posted by buddycraigg:
Show me the whole page please. |
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left is single speed rad fan in many "books" including FSM & Alldata.
right is I think engine blower but both on same page in whatever "book." Alldata & some others show as separate diagrams.
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buddycraigg
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DEC 13, 02:14 AM
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I agree with Ogre.
It is probably a diode in the relay and not a resistor.
A diode in this kind of circuit would keep it from back feeding when the magnetic field collapses when the relay is turned off.
A resister would give a "controlled" short circuit for something like a rotating motor coming to a stop.
I would still like to see the whole page of the schematic.[This message has been edited by buddycraigg (edited 12-13-2023).]
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