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I have recently acquired a '94 945. I noticed the wires for the push-in temp sensor on the radiator are not there. I can't find them. I know where to find the wires on my '89 740's but this is my first 940. Anyone have the wiring diagram? Any help would be great!! thanks.
Matt
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--- '89 744 Turbo automatic, '89 745 Turbo manual
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Thanos, are you just taking the new 745 on Sunday drives now?
'94 and '95 940s do not have that plug in temp sensor on the radiator.
The ECT (engine coolant temperature sensor) that partially controls the fuel and ignition also controls the cooling fan. Two wires come out of the FI control module (that's the one on the right side foot well), pins 10 and 11, and feed the two fan relays shared with the AC pressure sensors. The ECT sensor is located under the #3 intake. Blackstone and Nissen radiators come factory plugged, at least the ones I received.
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Tom F. Three 940s. '93 T-Rex now running. Mods, RainX. Lien holder on two more (the kid's). Rust In Pieces, '78 245
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The is my daily driver now (I can't wait for just one day a week, she's too much fun!)
I think I've got a replacement Nissen radiator. The 940's a replacement car for my sister. It's a sickness I tell you!!! First it starts with buying one, 'cause you heard they are safe and kinda look nice...then you kinda like the way it drives and you get attached to it quirky nature...then you modify or keep it original...then you gotta have another to modify or keep original...then other people see what your doing and either shake their heads or they buy one!!!! And it goes on and on and on... I've realized all you have to do to convert someone to a volvo is to get the to sit in the car...and then you see it their eyes...it's all downhill from there!!!
matt
oh, yeah...THANKS!!
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--- '89 744 Turbo automatic, '89 745 Turbo manual
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Chrissij is right on those condenser pressostats. But my '93 940 also has a thermal switch in the radiator. The 2 wires come up from a harness bundle that runs along behind the right head light from the fenderwell area. One wire is Black, the other is Black/White. They each have a rubber insulating boot.
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Bruce Young — Credo: "I tweak therefore I am"
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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You have two of them; in front of the condensor, as well as a high pressure sensor which will turn of the AC compressor. If memory serves me, brown is low speed, grey is high speed, and purples shuts down the compressor.
Chris
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uh, thanks. I ran the diagnostic test on the car and the cooling fan came on. So, I'm starting to wonder if this model even needs the push-in sensor. Do you know, Chris?
thanks.
Matt
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--- '89 744 Turbo automatic, '89 745 Turbo manual
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No, it doesn't need, nor does it use, the push in switch. It has the three pressostats on the condensor. These take the place of that push in switch. I guess I wasn't real clear...sorry...have a tendency to do that.
Chris
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No, it doesn't need, nor does it use, the push in switch. It has the three pressostats on the condensor.
Wish I had a '94 diagram, Chris, because I question the "doesn't need". Those 3 Condensor pressostats are only for the A/C system. Are you saying there is "no need" for the fan if A/C is off (or not working), and that the fan is only for A/C purposes?
On the '93, the Fan comes on HIGH if either the A/C brown Pressostat closes (at 334 psi) or the Radiator Thermal switch closes.
LOW fan is strictly A/C, via the Gray 'stat at 261 psi.
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Bruce Young — Credo: "I tweak therefore I am"
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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I can copy and fax you a copy of the wiring diagram if you like. In the entire schematic we have: the battery, the relay, the fan, the three pressostats (which are referred to in the book as the low-speed pressure sensor, engine cooling fan, the high-speed pressure sensor, engine cooling fan, and the high-pressure sensor, A/C), the ECU, and two grounds.
Chris
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Thanks Chris, but I think I see where we differ. My '93 940 Engine Cooling Fan diagram is similar, showing on left side, top down: 7/38 Low Speed P-stat, 4/23 LH ECU, 7/14 Rad. Temp Sw., and 7/40 High Speed P-stat, all feeding in to control 2/11, the cooling fan relay.
The difference is that my Regina car lacks the LH's two direct inputs to the Fan Control Relay (in parallel with the Low and High speed P-stats). Instead, the Regina uses the Radiator T-stat 7/14 (along with A/C P-stats 7/38 and 7/40). My High Pressure Cut Off P-stat (7/41) just opens the clutch circuit, and doesn't affect fan speed like 7/38 and 7/40 do.
Bruce
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Bruce Young — Credo: "I tweak therefore I am"
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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Awesome. Thanks, chris. I thought it wasn't needed, just wasn't sure. i guess it's a left over from the old design. I need to replace the radiator anyways, it's the old plastic side kind.
thanks again and for the quick response.
matt
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--- '89 744 Turbo automatic, '89 745 Turbo manual
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