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99 T5 Cooling Fan runs when car isn't up to temp yet

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Auburn T5
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Joined: 11 May 2007, 09:01
Year and Model: 1999 S70 T5
Location: Birmingham, AL
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Post by Auburn T5 »

Ok so I'm scratching my head on this one now.

I've replaced the vast majority of everything in my coolant system at this point due to some split hoses, leaky radiator, etc.

Here's everything that is new

All coolant hoses (even the small ones around the turbo)
Radiator
Coolant temp sensor
Thermostat
Coolant reservoir and level sensor
Cooling fan assembly
Heater core
Coolant lines running to firewall/heater core

The cooling fan assembly is the only part that is not OEM Genuine Volvo

The only code I currently have is an evap leak which I presume is being caused by a split vacuum hose back at the charcoal canister.

But yeah... in the mornings, I can have the car just backing out of the garage right after cold starting and the radiator fan will kick on and start running.

It also runs for a while when I get home from work but I assume that's normal if the car was driven hard or up hills.
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2020 - XC60 T5

1999 S70 T5 - Bilstein touring shocks/struts, B&G S2 springs, OBX full exhaust, other misc. stuff
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tryingbe
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Post by tryingbe »

A/C on?
85 GLH, 367 whp
00 Insight, 72 mpg
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FLXC90
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Year and Model: 98 V70 T5
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Post by FLXC90 »

Can you datalog actual coolant temp and cross-check output from ECT sensor? I don't know... does the temp go through ECU to turn on fan, or is it ECT to fan? If the latter, I would question the range on the fan.
Current Volvos:
1998 V70 T5, 112k sat 5 years, still in mechanical coma (finally at the top of the pile )
2004 XC90 T6 AWD: 186k, 60 on transaxle ( traded in )
1998 POS70 N/A: DD/training aid, 236k but really about 240k, I think...ABS module( passed on to son who sold it)
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Auburn T5
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Joined: 11 May 2007, 09:01
Year and Model: 1999 S70 T5
Location: Birmingham, AL
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Post by Auburn T5 »

tryingbe wrote:A/C on?
yes
2020 - Tesla Model 3 Performance
2020 - XC60 T5

1999 S70 T5 - Bilstein touring shocks/struts, B&G S2 springs, OBX full exhaust, other misc. stuff
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erikv11
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Post by erikv11 »

There ya go. A/C kicks the fan on regardless of engine temp. So you car is behaving as expected.
'95 854 T-5R, Motronic 4.4, 185k
'98 V70, T5 tune-injectors-turbo, LPT engine, 304k, daily driver
'06 S60 R, 201k
'07 XC70, black, 205k
'07 XC70, willow green, 223k
gone: '96 NA 850 210k, '98 NA V70 182k, '98 S70 NA 225k, '96 855 NA 169k
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Auburn T5
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Year and Model: 1999 S70 T5
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Post by Auburn T5 »

ah good deal.
2020 - Tesla Model 3 Performance
2020 - XC60 T5

1999 S70 T5 - Bilstein touring shocks/struts, B&G S2 springs, OBX full exhaust, other misc. stuff
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cn90  
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Post by cn90 »

Question re Aux Fan running when AC is on...

In my 1998 BMW 528i, when AC is on, the Aux fan runs. But once the speed is above ? 20-25 mph, the Aux Fan turns off as there is no need for it to run at that speed.

In the Volvo 850, S70/V70, does anyone know if the Aux Fan turns off while the car is in motion?
2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+
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