Question about 1993 Jeep Grand Cherokee
Run the engine up to temp and let it idle (best, in gear holding the brake just like when you are in traffic). When the temp duplicates what you see during times when it's too hot, put it into park and check the electric fan(s) to make sure they are on. Also check the clutch on the mechanical fan. (turn the engine off to do that and immediately try to turn the fan. It should offer reasonable resistance to turning when compared to how it turns when cold. If everything checks out as good, Make sure there are no obstructions to air flow through the AC condenser on the front side of the radiator (visible through the grille). If still everything is OK, flush the radiator. It's possible that you have a slight obstruction to coolant flow. Most Jeep radiators are a bit too small for the application and therefore sensitive to restrictions that in a larger unit, would not matter much.
Your air conditioner adds extra loading on the engine and also adds heat to the air flowing through the radiator. When in motion, you actually don't need fans as air flow is far greater than a fan can supply.
When standing still, coolant flow and air flow need to be near perfect to keep the temp where it needs to be.
If you do flush the radiator, when re-filling do that with the heater on high so you don't get an air lock in the system. Also make sure you run the engine long enough for the thermostat to open so you actually fill the entire system. Use a hydrometer to establish a true 50/50 mix to prevent boil-overs.
(even cheap ones are reasonably accurate)
Posted on Apr 05, 2011
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Posted on Jan 02, 2017
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