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Car Forum / Jeep / June 20051998 Jeep Grand Cherokee Laredo SE Straight V6 4.0L 4x4
My Jeep has recently had overheating problems, therefore my spouse and I have changed the thermostat, radiator, water pump, spark plugs, and all hoses, battery. It is running rough and vibrating still and will not stay running. The vents are blowing cold air when the controls are set for hot, even after the car has warmed up. The engine light does not come on, we've even tried the computer code reader and it says everything passes. I can't figure for the life of me what else is wrong. Can someone give any suggestions? Thank You, Gor595Gee I've heard on this NG about being careful when replacing water-pumps as the 4.0L has a reverse-spinning pump..? Can someone else confirm this? If you had overheating problems, maybe you've warped the head, and have a gasket leak? Are the oil & coolant still their natural colors? Five for five boxed incorrectly out of Pep Boys and Kragen: http://www.billhughes.com/waterPump.jpg God Bless America, ßill O|||||||O mailto:LWHughes3rd@aol.com > I've heard on this NG about being careful when replacing water-pumps as > the 4.0L has a reverse-spinning pump..? Can someone else confirm this? > > If you had overheating problems, maybe you've warped the head, and have > a gasket leak? Are the oil & coolant still their natural colors? We have the water pump that says "R". We also have noticed air coming from a certain part of the heads, and I do see some oil leakage, I will try that as well (change the head gaskets), but the heads are fine, no clanking noise (Pistons) while we let it run for 1/2 hour. Thanks The water pump we installed has an "R" stamped on it, the coolant is the color that came from the container we purchased. The oil however we plan to chang tomorrow. Thanks We have installed the water pump with "R" the coolant is the same color from the container we purchased, however we are going to change the oil tomorrow. Thanks yes i have seen that myself and also air pockets in the heater hoses will cause the same issue > I've heard on this NG about being careful when replacing water-pumps as > the 4.0L has a reverse-spinning pump..? Can someone else confirm this? > > If you had overheating problems, maybe you've warped the head, and have > a gasket leak? Are the oil & coolant still their natural colors? I'm no mechanic but it sounds like maybe your heater core could be clogged. We plan to check the heater core. It sounds like your heater core or the line going to it may be blocked for one thing. This could explain why the car is running hot and the vents are blowing cold air when the controls are set for hot. I don't know if that could be causing the engine to run rough and vibrate though. When was the last time you flushed the system? Nat Man > My Jeep has recently had overheating problems, therefore my spouse and I > have changed the thermostat, radiator, water pump, spark plugs, and all [quoted text clipped - 7 lines] > Thank You, > Gor595Gee We flushed the system before we did the work, the line is not blocked, we are going to check the heater core tomorrow. > My Jeep has recently had overheating problems, therefore my spouse and I > have changed the thermostat, radiator, water pump, spark plugs, and all > hoses, battery. It is running rough and vibrating still and will not stay > running. Check the plug wires and firing order... you might have two reversed. > The vents are blowing cold air when the controls are set for hot, > even after the car has warmed up. The engine light does not come on, we've > even tried the computer code reader and it says everything passes. I can't > figure for the life of me what else is wrong. Can someone give any > suggestions? Exorcism? __ Steve . The spark plugs are all fine. We still can't figure it out. Thanks |
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