1990 500 Aux Fan Questions / Diag
Recently took the SL out on a long road trip.
Temp gauge sat at 80 +/- on the road. In traffic it bumped up just above the line between the 80 and 120, I'll assume 100. Came down some when I started moving again. I checked it when I arrived, still close to that 100 mark, but no aux fans running. Fuse is OK. Searched here, not a lot of 129s with temp issue's. Did see one that made me think they only run with the A/C. Note my Climate Control is almost always in the EC Mode. A/C kind meaningless if you never drive with the top up. OK ??s Will the fans run w/o A/C Running. How can I check their operation ? Where is the sensor and relay ? Thanks |
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Thanks Mike.
Does the A/C have to actually be running. ie ambient temp 80, CC set at 70. Or is just having it "available" to run kick them on. |
I think it has to run. The sensor needs to see the compressor working and heat build up on the low pressure side.
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OK Tkanks all.
And thanks to BobTerry who's post doesn't show. But I got the Email Notification ????? Here's what I got in the Email ---Quote (Originally by kknudson)--- Will the fans run w/o A/C Running. ---End Quote--- Yes! ---Quote (Originally by kknudson)--- How can I check their operation ? ---End Quote--- If you disconnect the leads from the A/C high-pressure switch located at the receiver/dryer and short them together, then the fans should switch-on provided the ignition is on. ---Quote (Originally by kknudson)--- Where is the sensor and relay ? ---End Quote--- The relay that switches power to the fans is among the relays and modules behind the fuses in the main fuse box. In addition to the high-pressure switch, the climate control unit will switch on the fans if the outside temperature is greater than 90 degrees or if the engine coolant reaches a high temperature. *************** |
I knew there was someone smarter than I to give you the details. :dizzy2: Also my thanks to BobTerry.
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missed something in my cut and paste from BobTerry
Fuse is OK. ---End Quote--- There are two fuses -- did you check both? One is located just above and behind the brake booster. No I didn't know or check the second one, I'll do it shortly. Thanks all |
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If you only want to test the fans. Just short the wires on high/pressure switch color red with r 12 or green with r 134 fans should run. |
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