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I recently bought a 1983 DL 4wd wagon ea81 engine, 104 k miles from a dealer with "a bad carburetor that can't be fixed". I got it running smoothly with a can of cleaner and a few tanks of fresh gas w Lucas gas treatment. It still kept stalling at decel and only got 18 mpg, so i bought a carter carb kit w manual choke kit from redline and installed it.

 

I got it idling nicely-accelerates great, but now the radiator fan won't turn on, and of course it runs hot. I plugged the old vaccuum /emissions hoses during the carb install till i see what can be removed (never will need emissions inspection).  The only thing i can find in a manual that may affect it is a :thermosensor" in the old carb.

 

Is the fan not turning on because of a vaccuum/emissions hose that needs opened up, or the old carb sensor missing?---can this be by passed?

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The fan is controlled by the thermoswitch located in the radiator. Its under the upper hose on the passenger side. It controls the fans ground (no relay) so its a common enough failure. The connector is also a corrosion point as well. Also check the little ground strap on the top of the radiator. You can test the fan by grounding the thermoswitch connector directly.

Edited by ihscout54
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Thanks--will check it on my next free day. I know there had to be a relay problem causing the fan not to turn on, but it was weird that it began when i put the new carb on. As an aside,  I thought i read on this site a few weeks, ago that disconnecting certain of the emission hoses would cause the engine to run hot?

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Thanks- the fan switch/thermosensor is bad---ordered a new one, and temporarily plugged the wire to a ground wire  so the fan runs constantly when the ignigition is on.  New problem----i discovered a crack in the passenrer side radiator tank just below the switch, and successfully soldered it so it no longer leaks. However---when I pulled the radiator i discovered that the top mounting bracket is not soldered or attached to the radiator tanks--it came off the radiator when i unbolted the fan bracket.. Should it be attached?? Was thinking of using an epoxy resin or JB weld to re-fasten if it is supposed to be attached.

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