|
S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
Information |
|
Rad fan manual override switchViews : 703 Replies : 11Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Nov 7th, 2018, 20:17 | #1 |
New Member
Last Online: Nov 26th, 2018 18:02
Join Date: Nov 2017
Location: illovo beach
|
Rad fan manual override switch
Hello, 2002 V70 XC70 2.4T gearmatic, how/where to fit radiator fan override switch? reason - towing biggish caravan and fan manual control will be of great assistance on long inclines (hot climate in South Africa), if manually can switch fan on earlier rather then wait for ecu commanding on/off sequence. Currently fan goes on too late and experiencing overheating, same sometimes happening in slow moving traffic. please assist.
kind regards Jan |
Nov 7th, 2018, 21:23 | #2 |
Premier Member
Last Online: Apr 2nd, 2024 19:50
Join Date: Dec 2007
Location: Wexford
|
Hi Jan
My gut says there is something wrong with the cooling system. Rad fins blocked, stat not opening fully, fan not seeing full speed signal. How does the temperature gauge behave in normal driving? As for a bypass I'm not even sure it's possible with those fans on pulse width modulation for speed control. |
The Following User Says Thank You to Brendan W For This Useful Post: |
Nov 8th, 2018, 13:52 | #3 |
New Member
Last Online: Nov 26th, 2018 18:02
Join Date: Nov 2017
Location: illovo beach
|
Hi Brendan
some observations: ac on - fan goes on low at 55 deg C stat start opening at +- 92 deg C ac off normal running fan go on low at +- 96 deg C temp read 108 deg C fan go on high, go off at +- 96 deg C (in city traffic) new radiator fitted, cooling system flashed ( found overflow bottle small dia outflow blocked with rubbish, cleaned and it seems local pressure build up being sorted) taken t/stat out to test coolant flow, water pump seems to work ok, engine idle and at 2000 rpm, coolant temperature stay between 74 - 90 deg C mind you not tested towing trailer only in traffic, seems better, concern: cant drive with out t/stat as once coolant get hotter its difficult to cool off due to circulation speed, its not being controlled. t/stat - start opening at 93 deg C, think its too high ?? Think ? if cannot fit override switch to fan high speed ?? how to change ac fan on from low to high speed? another observation is that rad fan does not having relays?? maybe I am wrong here... your input appreciated regards Jan Last edited by jroz; Nov 8th, 2018 at 14:02. |
Nov 8th, 2018, 13:57 | #4 |
New Member
Last Online: Nov 26th, 2018 18:02
Join Date: Nov 2017
Location: illovo beach
|
the temperature gauge sit in 12 o'clock position from about 68 deg C , its really useless piece of equipment.........
|
Nov 8th, 2018, 16:24 | #5 | |
Senior Member
Last Online: Nov 1st, 2021 21:18
Join Date: Sep 2016
Location: Tartu
|
Quote:
If you're interested, then search and you will find. The ECU monitors the coolant temperature and depending how much it exceeds the desired working temperature, it will alter the PWM signals duty cycle (0-100%) sent to radiator control module to get desired fan speed. In this video, the ECU is replaced with a calibrated PWM generator. https://www.youtube.com/watch?v=i6go2VTr5bY
__________________
2002 V70 D5 |
|
The Following User Says Thank You to MarvinMitt For This Useful Post: |
Nov 8th, 2018, 20:18 | #6 |
Premier Member
Last Online: Apr 2nd, 2024 19:50
Join Date: Dec 2007
Location: Wexford
|
Is the thermostat opening fully ?
The manual I have gives 90C opening starts and 105C fully open. I imagine that there are variations for different markets. Last edited by Brendan W; Nov 8th, 2018 at 20:30. |
The Following User Says Thank You to Brendan W For This Useful Post: |
Nov 9th, 2018, 17:00 | #7 |
New Member
Last Online: Nov 26th, 2018 18:02
Join Date: Nov 2017
Location: illovo beach
|
Hi Brendan, yes my is similar, start opening at 93C and is fully at 108C at which point the fan goes to high speed mode, sometime its OK and the coolant temperature drop fast, depend on driving situation, highway or city driving but its crazy as the stat working overtime all the time......... maybe the volvo is not so good in towing trailers....
thanks jan |
Nov 9th, 2018, 17:35 | #8 |
Premier Member
Last Online: Dec 26th, 2021 13:42
Join Date: Dec 2013
Location: Crewe
|
I think you have a circulation problem.
When the engine is starting to overheat carefully check the temperature of all coolant hoses. If the system is unable to maintain temperature and overheating, all hoses should be too hot to hold. If one hose is significantly cooler, it obviously isn't carrying 100°C coolant so the hose or something before it is blocked. The small diameter hose linking the top of the radiator to the expansion tank would be my first suspect followed by the lower radiator hose and heater hoses but check everything.
__________________
2002 S60 SE D5 Manual 209000 miles |
The Following User Says Thank You to cheshired5 For This Useful Post: |
Nov 9th, 2018, 18:37 | #9 |
Premier Member
Last Online: Apr 2nd, 2024 19:50
Join Date: Dec 2007
Location: Wexford
|
Is it possible that the water pump was replaced with something non Volvo and that it doesn't have the same ooomph. Reaching a bit but that car should tow a caravan to Hell and back.
Could the fins in the intercooler and/or the a/c condenser be clogged and restricting airflow? Is the undertray still fitted? Dealer here swore they just make things too hot. |
The Following User Says Thank You to Brendan W For This Useful Post: |
Nov 9th, 2018, 20:39 | #10 |
Senior Member
Last Online: Nov 1st, 2021 21:18
Join Date: Sep 2016
Location: Tartu
|
__________________
2002 V70 D5 |
The Following User Says Thank You to MarvinMitt For This Useful Post: |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|