- Location
- Murrieta
Got a new motor which I did not get to hear run. As an FYI this is in a 93 jeep.
Put a new A/C delco water pump, thermostat (with the bleeder holes) radiator and hoses on. Ran the motor and it ran warm 230 ish and the fan did not turn on. I thought the sending unit on the new motor might be bad so I replaced it. Ran the motor for 5 mins tops and the temp kept climbing until I turned off the motor at approx 230-240 (the mark before the red). There was no dip in the temp when I figured the thermostat would open. Replaced thermostat with a new stant and water pump with a NAPA unit, verifying the correct impeller and verifying I had flow through the block by using a garden hose to check flow from the empty thermostat housing out the water pump location. Buttoned everything up, filled the system with 50/50, removed the sending unit on the back of the head to bleed the system, started the motor and the temp kept climbing until I turned it off around 240. I am confident the belt is routed correctly as I compared it to my other jeep and the diagram (water pump spins counter clockwise).
Took the thermostat out, kept the upper hose off, started the motor and verified I had flow out of the upper hose. It was not a constant steady flow at idle, more of a surge of flow, a lull, surge, ect. Started it and ran it for about 5 minutes without the thermostat and it warmed up to around 220-230 with 50/50 coolant. Verified fan clutch was good by a rag being pulled into the fins on the radiator and staying against the side opposite the fan.
Throughout all this the electric fan has not turned on, and I have verified the fan is working by removing the connector from the CTS and the fan turns on. I checked the resistance at the CTS and it indicated the temp the senor read was approx 180-190 and I verified this by using the thermocouple on my multimeter and it read the same temp through conduction by touching the TC to the thermostat housing while the gauge has read 220-230.
Tonight frustrated, I put a thermostat back in the motor, pulled the upper hose, put the garden hose in the radiator and started the motor. It ran up to about 220 or so after 2-3 minutes, without a drop in temp when the thermostat should have opened, and I shut it down. While it was running, less than a dribble of water was coming out of the upper hose. I am not sure if that was because the water was boiling in the block and no flow was exiting the thermostat or not. Drained all the water from the lower hose and the water was extremely hot coming out of the block indicating the temp sensor is reading a hot temp.
I also checked the compression tonight. All six cylinders were 135-140. The plugs looked good, but they are all of an hour or so old. I want to try a CO2 test, but I am not sure if I will see much flow out the thermostat to measure for that.
I will admit I will probably be slow to respond so bear with me. I have done a good deal of searching and I am stumped as to what is causing this issue and I apologize for the novel, but I wanted to mention all I have done.
Put a new A/C delco water pump, thermostat (with the bleeder holes) radiator and hoses on. Ran the motor and it ran warm 230 ish and the fan did not turn on. I thought the sending unit on the new motor might be bad so I replaced it. Ran the motor for 5 mins tops and the temp kept climbing until I turned off the motor at approx 230-240 (the mark before the red). There was no dip in the temp when I figured the thermostat would open. Replaced thermostat with a new stant and water pump with a NAPA unit, verifying the correct impeller and verifying I had flow through the block by using a garden hose to check flow from the empty thermostat housing out the water pump location. Buttoned everything up, filled the system with 50/50, removed the sending unit on the back of the head to bleed the system, started the motor and the temp kept climbing until I turned it off around 240. I am confident the belt is routed correctly as I compared it to my other jeep and the diagram (water pump spins counter clockwise).
Took the thermostat out, kept the upper hose off, started the motor and verified I had flow out of the upper hose. It was not a constant steady flow at idle, more of a surge of flow, a lull, surge, ect. Started it and ran it for about 5 minutes without the thermostat and it warmed up to around 220-230 with 50/50 coolant. Verified fan clutch was good by a rag being pulled into the fins on the radiator and staying against the side opposite the fan.
Throughout all this the electric fan has not turned on, and I have verified the fan is working by removing the connector from the CTS and the fan turns on. I checked the resistance at the CTS and it indicated the temp the senor read was approx 180-190 and I verified this by using the thermocouple on my multimeter and it read the same temp through conduction by touching the TC to the thermostat housing while the gauge has read 220-230.
Tonight frustrated, I put a thermostat back in the motor, pulled the upper hose, put the garden hose in the radiator and started the motor. It ran up to about 220 or so after 2-3 minutes, without a drop in temp when the thermostat should have opened, and I shut it down. While it was running, less than a dribble of water was coming out of the upper hose. I am not sure if that was because the water was boiling in the block and no flow was exiting the thermostat or not. Drained all the water from the lower hose and the water was extremely hot coming out of the block indicating the temp sensor is reading a hot temp.
I also checked the compression tonight. All six cylinders were 135-140. The plugs looked good, but they are all of an hour or so old. I want to try a CO2 test, but I am not sure if I will see much flow out the thermostat to measure for that.
I will admit I will probably be slow to respond so bear with me. I have done a good deal of searching and I am stumped as to what is causing this issue and I apologize for the novel, but I wanted to mention all I have done.