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#1
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A/C mod to turn Aux Fan on right away?
This is regarding my '88 300TE.....I know you diesel guys are more experienced with the A/C systems....
My '87 260E's turns on the aux fans right away when the A/C is turned on to improve performance (must have been dealer mod) and I want to do the same with my 300TE. Anybody know how to achieve this the easiest way? Right now my aux fan does not turn on basically at all. I know it works because I've heard it, but the A/C never clicks it on. I think performance would be much, much better if it were running all the time when the A/C is on. Thanks guys!
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#2
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Without having the electrical schematic for your vehicle, I would suspect that you could just wire the fan relay in parallel with the compressor relay.
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#3
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manual switch parallel with low pressure switch
You asked simple, so run wires connected to each lead of the low pressure switch on the receiver/dryer to a manual switch in your interior. Flip the switch, and the fans will be on at low speed
Sort of related, I ran wires connected to the temperature sensor on the block for high speed fans. The sensor kicks them on when engine temp over 105, but I wanted to run them in the summer for about two minutes before the engine is turned off to keep the temps at 90 or lower. I used a MB overhead light switch installed in the center console as the manual switch. The post above is a cleverer idea though. |
#4
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Your refrigerant is low. Get the pressures right, and the fans will come on almost immediately like they did when new.
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Gone to the dark side - Jeff |
#5
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Quote:
Jump the switch on top of the r/d and the fan should come on at high speed immediately when you call for A/C. Yours is a 88 and works on pressure. The switch on some old MBZ models works on temperature.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#6
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The fans on my W126 come on almost right away. I may re-wire it such that the first speed comes on whenever the compressor is on, and the 2nd speed comes on whenever the refrigerant temp switch closes.
-J
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E. |
#7
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Quote:
http://catalog.peachparts.com/ShopByVehicle.epc?q=1988-Mercedes--Benz-300te-Climate--Control&yearid=1988%40%401988&makeid=63%40%40MERCEDES+BENZ%40%40X&modelid=6240%3AED%7C10000013%3AMBC%7C1521%40%40300TE&catid=242213%40%40Climate+Control&subcatid=242240@@A%2FC+Temp%2E+Switch&mode=PD |
#8
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That would explain my findings today with my TE. Guess I need to pull my vac pump out and do the purge and fill dance.
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08 R320 CDI current Past 95 E420 87 300D Turbo 5spd 90 300TE 83 300SD 85 300TD 92 400E 85 190D |
#9
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Quote:
The reason that my 260E's turn on right away is whatever mod the dealership did....There is some sort of relay and wiring going on by the R/D...Maybe I'll get the part # of the relay and that may help to figure out what they did. I do remember it being bosch.
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2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#10
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Quote:
If it woks on temperature then put the sensor in a tub of boiling water and measure the resistance. Jump the wires with a resister of the same value. The principle is the same.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#11
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We are not dealing with a rheostat here. It's just a switch; it's either open or closed. No resistor required.
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#12
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What leads you to believe that those pressures are good?
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#13
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So typical
Another typical example of withholding info. If you knew the answer then why didn't you just posted it in the first place. You feel better if OP and whoever comes back to beg for more info.
__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#14
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ditto
looks like a low charge to me
__________________
08 R320 CDI current Past 95 E420 87 300D Turbo 5spd 90 300TE 83 300SD 85 300TD 92 400E 85 190D |
#15
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Quote:
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
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