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Hi,
I just spent all day trying to get the radiator fans working on a 1995 LHS. The engine will overheat at idle and the fans do not come on. The low and hi fan relays have only 7 - 9 volts coming in to the them through the small green wires with black stripes.I wondered if you knew if these relays should have 12 volts coming into them. The other relays(AC, Fuel Pump, etc.)all have 12 volts in this wire. One of the fan connectors looks like it was hot at some point and if I hook power to it it heats the power wire. I ended up unplugging that fan, and running a jumper wire from the AC relay to the high fan relay. Now one fan comes on with the engine and stays on all the time.(Mickey mouse ,I know ,but it keeps it from overheating.)
I think it may be that one of the fans is bad and drawing too much power, but even with it unhooked the other one will not come on without the jumper wire.
I hope this is not too confusing. Any thoughts much appreciated.
Thanks,
Allan
Answer -
Hi Allan,
I don't own the complete wiring diagrams for the LHS, just the Haynes. But I do have the diagrams for the '96 Cirrus/Stratus which is similar in year and probably circuit design. Indeed all the green black wires are supposed to have full battery voltage on them (have you checked them with the fan relays pulled out). The fact that other relays with the same supply line have 12 suggests that the splice in the power distribution center where they come together has some internal resistance so that the fan wires are loosing some of the voltage at that point, or that the relays are bad and drawing down the voltage as a consequence (but that should revert if you pulled the relays). So it could be that there is not sufficient voltage to close the relays due to that below spec voltage on the green/black wires of those relays. In the Cirrus that same supply line is shared with the AC clutch relay, evap purge solenoid, instrument cluster, and vapor canister leak detection pump. So there must be something wrong with your internal splice in the power center if all the other items are operating o.k. I wish I had the full diagrams but I can't have everything. The fuse for that wire is 10 amp but I don't know its number, but it is not likely the problem. It in turn gets its voltage on a dark blue wire from the ignition switch. Chrysler engineering seems to be consistent with color codes and approaches from model to model in a given time period, which is helpful.
Let me know if you find out why you have the voltage drop.
Roland
Hi again,
I never did find out why the voltage was low in those 2 wires. I finally cut them and spliced into the green/black wire coming to the AC relay and used it as a power source for the 2 fan relays. Now the fan comes on when it should and goes off when it should. The AC is not being used right now ,the belt is not on the compressor. I am also still using just the one fan, I am quite sure the other is drawing too much power and I wonder if this may have had something to do with the drop in the voltage in the original 2 green/black wires.
The way it is now seems to work OK. If I ever want to use the AC I will probably have to get a new fan to replace the faulty one.
I found this website through a search for LHS repair on google and I think it is a great idea and once again I would like to thank you and the other experts who donate their time and expertise to help total strangers like myself.
Keep up the good work.
Yours truly,
Allan
AnswerHi Allan,
Thanks for the progress report. The drop in voltage on those two wires would be hard to attribute to the faulty fan motor because the voltage sources for the fan motor and for the relay control circuit are independent of oneanother. It was very smart of you to detect the sub-normal voltage on the relays; most people would be content to have found there to be voltage present and passed it over.
Thanks for the positive evaluation.
Roland
