Good afternoon,

So after many forum searches, I have come up dry.

Put new tires on, new brakes on, disco was running fine before this. Start it up and climate control panel is not powering up. the 10amp fuse is blown and there is a short somewhere in it. Took it for a 1 mile drive to test brakes and it over heats. Will sit and idle all day but once load is put on it takes about 1 -1.5 miles for it to overheat. (checked by OBDII guage).

Bought in June, Previous owner did head gaskets, new radiator, lines, inline thermostat, plugs, wires.
It was over heating when we got it. We put a new thermostat in ( previous owner had it installed backwards) bled the system and has run great since.

Items we just replaced
New thermostate, inline housing, new lines, complete brake job, tires, headliner.

I am confused as I cannot find the short, for the climate control system. The fans seem to be turning on, all relays check good, all other electronics work as should. Any ideas. Thanks.

Al

 

The way I’m understanding your write up is that you have two different issues.

1. You need to figure out where your short circuit is and fix it. You will almost certainly need the Electronic Troubleshooting Manual to trace the wiring, unless you happen stumble on the fault.

2. I don’t think your overheating issue is at all related, unless the temp indication is somehow inter related to your short circuit (and it’s indicating an over temp, but not actually overheating).

 

Recommend you unplug your hvac control unit, you will need to remove the lower cup holder get at the tabs holding it in from where the ashtrays are. Once unplugged replace the fuse and see if it blows.

Overheat is a plugged radiator. Idle all day with no overheat but overheats with a load on it is always a bad radiator. I bet if you check with an ir gun or pen you will find DS of rad is hot, ps is cold.

 

I did take the HVAC control unit out still blowing fuses. This confuses me as we parked it about a week ago, everything worked started it up last night and developed a short somewhere. will continue to trace that.
The previous owner did say they replaced the radiator but who knows will grab Temp gun and check it out.

Thank you guys for the information and help.

 

Which fuse # is blowing?

 

F31 10a

 

That fuse powers several devices. A splice distributes the power to several devices. Suggest you disconnect all connectors downstream of the fuse, C0750, C0765, etc. Look at page 660 of Rave electrical library for the connector locations and search for Fuse 31 in the electrical wiring diagram section of the Rave. Once you have all the connectors unplugged, you can test for ground at the fuse slot. If it is grounded then you a wiring short. I suspect a device failure, not a wiring short. If it does not test to ground with everything unplugged, plug them back in one by one until you find the one that goes to ground.

Did you do a search on the forum for Fuse 31? Unlikely you are the first one to have this issue.

 

Thanks for the information, will get trace it this week sometime. Appreciate the help.

 

Well new nissen radiator, flushed coolant out. Pressure tested good held pressure and vacuum. Made it 2 miles, temp held great then instantly spiked. I am stumped

 

Just a guess, could the heater core be plugged, preventing flow? Clean it out with a hose or bypass it temporarily.

What about removing the thermostat and seeing if that help?

If the PO did all that work, there must have been a problem. Could the coolant passages be plugged with radiator or head gasket plugging fluid?