ramcharger fan question

[Sleeper1987]

ok guys im not real familier the way these are set up so i will try to explain this the best i can .

both fans run a-ok

it has a 3 position toggle switch that plugs into the harness.

the problem is i dont have a "hi" position lo/off/lo is what i have how do i get them to work on "hi" i get a little warm in traffic with the a/c on and need to remedy this problem asap.

 

[pacecarta]

the stock fan , when the low side relay is activated power is supplied through a resistor mounted at the fan and this gives you low fan speed , when the high relay is activated the fan is powered direct (no resistor )and runs in high speed

the dual fan both fans run but needs power to both power in wires to get high speed.

when you activate the low relay manually you have low speed but when you switch to high you turn off the low and activate the high relay and still only have one power wire active and get low speed operation

if the car is running and at temp that the fan would come on then activating the high speed relay the fan should run high speed mode

if you are using a caspers adapter to stock harness i dont think that adapter allows you to select high or low

if your wiring will allow low and high operation through stock relays and you are running a stock chip then turnon temp will be high (190+*) and fan will only come on in low speed when a/c is on unless temp is above 190 but if you run a/c and manually turn on the low speed relay switch than you should get high speed.


i run the racetronix hotwire
with the rtx both fan power wires are powered using stock relays to turn on two relays being fed direct from the battery ,
in normal operation i have low speed when temp is above ecm fan turn on temp (for my chip that is 168*).
turn on a/c when low speed fan is being commanded by ecm and I have high speed.
I also run a single manual switch wired to the stock high side relay which grounds the green wire ,
turn on manual switch when temp is above ecm turn on and I have high speed once it drops below temp i have low speed .
turn on manual switch when temp is below ecm turn on and i have low speed for cool down in the pits.

 

[Sleeper1987]

the stock fan , when the low side relay is activated power is supplied through a resistor mounted at the fan and this gives you low fan speed , when the high relay is activated the fan is powered direct (no resistor )and runs in high speed

the dual fan both fans run but needs power to both power in wires to get high speed.

when you activate the low relay manually you have low speed but when you switch to high you turn off the low and activate the high relay and still only have one power wire active and get low speed operation

if the car is running and at temp that the fan would come on then activating the high speed relay the fan should run high speed mode

if you are using a caspers adapter to stock harness i dont think that adapter allows you to select high or low

if your wiring will allow low and high operation through stock relays and you are running a stock chip then turnon temp will be high (190+*) and fan will only come on in low speed when a/c is on unless temp is above 190 but if you run a/c and manually turn on the low speed relay switch than you should get high speed.


i run the racetronix hotwire
with the rtx both fan power wires are powered using stock relays to turn on two relays being fed direct from the battery ,
in normal operation i have low speed when temp is above ecm fan turn on temp (for my chip that is 168*).
turn on a/c when low speed fan is being commanded by ecm and I have high speed.
I also run a single manual switch wired to the stock high side relay which grounds the green wire ,
turn on manual switch when temp is above ecm turn on and I have high speed once it drops below temp i have low speed .
turn on manual switch when temp is below ecm turn on and i have low speed for cool down in the pits.

ill take a few pics of what i have.

 

[Sleeper1987]

i found the temp sensor on the intake is bad. does anyone have a part number for a 165-185* one? instead of the 195

 

[Sleeper1987]

i found the temp sensor on the intake is bad. does anyone have a part number for a 165-185* one? instead of the 195

anyone?

 

[pacecarta]

very doubtfull changing a sensor is your problem
a thermostat and chip with proper turnon maybe but not the sensors

there are three temp related sensors

only the one for the ecm is a true sensor , it is behind the cam sensor in the intake and has two wires (yellow and black) , and if it reads wrong then youll have other issues beside low speed fan turnon ,

the other switch (not sensor) is on top of the manifold and it is the overheat fan turnon switch (green with yellow stripe) and would need to be over 205 before it grounds and activates the high speed relay

the last one is on passenger side and only function is to turn on the indash idiot light if the vehicle should near overheat

 

[Sleeper1987]

very doubtfull changing a sensor is your problem
a thermostat and chip with proper turnon maybe but not the sensors

there are three temp related sensors

only the one for the ecm is a true sensor , it is behind the cam sensor in the intake and has two wires (yellow and black) , and if it reads wrong then youll have other issues beside low speed fan turnon ,

the other switch (not sensor) is on top of the manifold and it is the overheat fan turnon switch (green with yellow stripe) and would need to be over 205 before it grounds and activates the high speed relay

the last one is on passenger side and only function is to turn on the indash idiot light if the vehicle should near overheat

yes im aware of the locations for this purpous i need to clarify im refering to the one under the throttle body with the single wire hookup. if i unplug it and ground the wire i receive full fan function lo/hi were before

i have a switch with 3 positions lo/auto/hi previously i only had low low/o/o
'0' representing what doesnt work. ground the wire to the "sender/sensor/" and i recive lo/lo/hi making the fan run all the time with the switch on but also gaining the "HI" position that i didnt have before. the car has a 160-165* thermostat in it and would assume a 'sensor/switch" in the right range would make the system work as intended again.


for now i simply grounded the wire so i have "hi" fan function.

 

[pacecarta]

the sensor (switch) at top of intake is a safety to prevent overheat should the low speed relay fail to turn on and temps get that high

if coolant temp is above chip turnon (low speed relay will be active due to coolant temp commanded by ecm ) and if the a/c switch works properly when a/c is on it will activate the high speed relay and you will have high speed fans

 

[Sleeper1987]

the sensor (switch) at top of intake is a safety to prevent overheat should the low speed relay fail to turn on and temps get that high

if coolant temp is above chip turnon (low speed relay will be active due to coolant temp commanded by ecm ) and if the a/c switch works properly when a/c is on it will activate the high speed relay and you will have high speed fans

i guess i have a relay issue also . there was no automatic function to the fans.

can the switch/sensor on the intake be purchased at autozone?

 

[pacecarta]

http://www.vortexbuicks-etc.com/fan.htm

get the high and low relays to work as they should

i never see over 176 with my setup running a/c on the hottesst day , otherwise never over 170 . only when i had a fan fuse blow in my hotwire (had wrong fuse in there) which prevented the fans from running on low speed relay side did i get hot enough at idle to have the high temp switch activate and turn my fans on ,
the high speed fan switch on top of intake shouldnt even come into play unless you are nearing overheat , replacing it isnt your problem ,
heres the stock one
http://www.partsamerica.com/ProductDetail.aspx?mfrcode=BOR&mfrpartnumber=TFS8&parttype=843&ptset=A

for the dual fans to manually operate with one switch you need a dual pole switch , when switched to one side will ground just the low speed relay and when switched on the other will ground both low and high and when switched to center its off
or just hook two single switches , one to each relay on the fender , turn one on and you'll have low and turn both on you'll have high

http://www.t6p.com/forums/showthread.php?t=5970

 

[DR BOOST]

i have the ramchargers fan and i thought there was only one speed....

so just to clarify, if one of the red wires on the fan is powered up, both fans run on low speed?

and if you power up both, both run on high?

-or-

low speed equals one fan and high equals two?

 

[pacecarta]

i have the ramchargers fan and i thought there was only one speed....

so just to clarify, if one of the red wires on the fan is powered up, both fans run on low speed?

and if you power up both, both run on high?

yes

 

[PaCemkr86]

i just found this thread and im having the same problem.
My car isnt over heating, but i just installed the manuel switch from caspers and i only have low speed fans working. When i flick the swtich to high i hear the relay clicking.
i swapped the low and high relays and then i didnt even have low speed fans, swapped em back and then i had low speed again , but still no high.

i also have the racetronix dual fan harness with Ramchargers dual fans

 

[PaCemkr86]

thanks for the link to t6p where racetronix posted schematic

 

[Ormand]

According to the shop manual, the fans come on "HI" when the temp reaches 226F. That seems too high to me, if you have a lower than stock thermostat, but I don't know of a switch/sensor with a lower setting. Seems to me that Sleeper might have the fans wired in series with this switch/sensor, so the fans won't come on "HI" unless the switch is closed-coolant temp above 226. If the manual off/lo/hi switch was wired in parallel with the stock temp switch/sensor, then it would turn the fans on "HI" regardless of the coolant temp. Or, he could just ground the wire at the sensor/switch, and then it would be "always on", and the manual switch would control fan speed.

 

[pacecarta]

problem is the caspers switch is hi or low , for dual fans to run in high speed both power leads to fans need to be powered , only one and you have low , doesnt matter which one either , so hi and low relays need to be active at the same time for high speed operation of the ramcharges (valeo) dual fans and the hotwire

a/c peressure switch grounds both high and low speed relay when a/c is running (needs to be charged and functional) , caspers uses this connection at the ac switch for the fans to a incar switch manually ground hi speed relay and lowspeeed but since its a togle its doesnt ground both , you get either high speed relay ground r low speed relay ground , result is low speed fans in either positions ,

without a/c on for high speed on duals conditions would be
(1) coolant needs to be above fan turn on at ecm so low relay is active by ecm and then manually switch high relay (ground green wire to high relay) will activate the duals in high speed

(2) coolant has to be above 226Deg F and then both relays will be on sinceecm will be comanding low relay and overheat temp switch at manifold will ground high relay

(3) manual ground both green wires to the relays (hi and low ) and the fans will run in high speed

(4) wire both power feeds to dual through the one relay as is the case with the harness adapter (not hotwire) and youll have high speed fans all the time but no low speed , and since the high relay isnt in the picture no high speed relay overheat switch safety net .

in pacemakers situation his factory system doesnt work as it should due to a bad relay (he proved this with the swap) so how could he get high speed with only 1 power feed hot to the duals

personally ive never seen the need for high speed , i did run a switch to activate the fans to cool down in the pits but rarely even use that