When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!ZJ (93-98), WJ (99-04), WK (05+)
All ZJ/WJ/WK specific tech questions asked here!
I just picked up a 99 Grand Cherokee 4.0 2wd Automatic for $750, it wasn’t running. Replaced the Crank Position Sensor and it fired up. But my question is that it has 2 cooling fans and I think one isn’t factory installed. It has an electric fan attached to what looks like a fairly new radiator and then it has a clutch fan attached to the water pump pulley. The cooling shroud has been cut out at the top, maybe to make room for the clutch fan? It might fit without it being cut if the center was raised like many other shrouds I have seen. Maybe they cut it to make it easier to work on something? Not sure exactly what is going on but I would like to repair it back to the stock setup.
Engine: 4.3L with headers and full 3" exhaust system
If you look at your radiator you will notice it is short and wide. To compensate for that shape and provide adequate air flow to it there is two fans. The main mechanical fan pulls about 1800 cfm and the auxiliary fan comes on at high temps or when you use the AC or defrost. The main fan shroud is not much, but it does help. To see if it was cut up post up a pic for us
Let's see a picture if you can post one. I am curious
As said above, there really isnt much to the factory fan shroud. they are easy to break especially if you accidentally lean on it while the engine is running
It’s obviously cut, looks like someone took a sawsall to it and cut the top hump out of it. I am not near it at the moment its over at a friends house. I will try to get a picture tomorrow.
Some WJs had 2 fans if they had the factory tow package. An electrical fan with a clutchfan behind it within the same shroud. In order to replace the water pump, both had to be removed. The proper way to do this is loosen the shroud and push it back over the clutchfan, Pull the radiator with the e-fan attached up and out, slide the shroud forward and lift it out, then remove the clutchfan. Some people simply chopped the top of the shroud to gain access to the clutchfan and glue it back together later, if at all. There were many different fan setups in the WJ as the years progressed and the 4.7 V8 was involved, culminating with the ridiculous hydraulic fan powered by the power steering pump on the 4.7.
My 2000 4.0 only has a single speed electric fan that is controlled by a pulse modulated relay that the PCM uses to control it's speed. Direct power for high, and a pulse width supply to run it at low speed. Later models of this same system used a fan wired for 2 speeds and separate relays to control them. Remember the 99 models were the first to use the fully integrated CCD Bus system in which all the modules talked to each other.
If I remember correctly, the clutchfan on your 99 is smaller in diameter then the one on the 98 ZJ and the e-fan is a single speed fan with a relay to run only on high when the engine temp is 220* and turn off after it drops to 208*. Mine, with the pulse relay, doesn't turn on at all until it reaches 215*, then drops to low speed at 208* and runs at low until either the temp goes up again or you shut the engine off. My temperature gauge needle only moves just off the center mark above or below it a tiny bit all the time, unless there is a coolant problem. My water pump has the threads to mount a clutchfan, but never had one.
It should have a factory trailer hitch, a trailer lighting module with a pigtail harness or a socket on the hitch, and an aux transmission cooler. Also the 4.0 should have 3.73 gearing, but not necessarily so. Up until 98 they did, but beyond that IDK. I say that since my 2000 XJ has the tow package, but has 3.55 gearing.
That fan just doesn't look right to me. It's entirely possible the PO added it himself for whatever reason. It's hard to tell, but it just isn't right in my opinion. Someone used the old duct tape trick to hold the shroud piece on, didn't they?
If you have the original electric fan and a good shroud, you shouldn't need the clutchfan, assuming the e-fan works as it was designed to. If it's a 99, the relay should be underneath the passenger's headlight. I'm thinking the electric fan quit working and the guy installed the clutchfan and called it good enough.
Here's some pics of my setup. It's a 2000 4wd without tow package and it's actually a 99 since it was built in August of 99. I have to apologize for the crappy mess on the valve cover gasket. That was done by my mechanic in a hurry, but it doesn't leak either. All the yellow tape was from the engine swap.
They e-fan looks about the same but the mechanical fan does look out of place. The e-fan does work when I switch the AC on and Off and it does have a factory installed tow hitch so maybe it was part of the towing package? I have the headlights out right now and was able to locate the relay.
They e-fan looks about the same but the mechanical fan does look out of place. The e-fan does work when I switch the AC on and Off and it does have a factory installed tow hitch so maybe it was part of the towing package? I have the headlights out right now and was able to locate the relay.
Your fan set up is very interesting to me, because I only use my 2003 WJ as a tow rig, and any modifications I do are to make my rig more efficient for towing. After seeing what you’ve got, I know now that a two fan system is feasible, question is whether it would provide enough supplemental air movement for improved cooling for towing to make it worthwhile for me. My e-fan works well, although an increase in CFM’s would be beneficial. I have a fan clutch in my parts cabinet, just need a fan, seriously thinking about giving it a try.
Your fan set up is very interesting to me, because I only use my 2003 WJ as a tow rig, and any modifications I do are to make my rig more efficient for towing. After seeing what you’ve got, I know now that a two fan system is feasible, question is whether it would provide enough supplemental air movement for improved cooling for towing to make it worthwhile for me. My e-fan works well, although an increase in CFM’s would be beneficial. I have a fan clutch in my parts cabinet, just need a fan, seriously thinking about giving it a try.
So along those lines I will tell you, well at idle I turned in the AC to cause the EFan to come on and the increase of airflow from the EFan just about stopped the clutch/mechanical fan. So it seems the clutch fan works well for standard cooling, but when extra airflow is required and the EFan kicks in it becomes pretty useless. At least from looking at it.
10-10-2020, 05:08 PM
2 Cooling Fans?
