Overheating issue, again..
Thread Starter
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Member
Joined: Sep 2007
Posts: 109
From:
Overheating issue, again..
I thought I fixed the issue last time, turns out I didn't...
Before the lower radiator hose never got warm, now that I've done everything that I have, it gets hot now.
I've replaced the following.
Radiator
Thermostat
Thermo Switch
Water Pump
Thermostat Housing
Bled System with 50/50
Cooling fan relay
Now, here's where I think my problem lies. My fans will not kick on after running, the temp gauge gets to about 3/4 and they still are not turned on. If I jump the thermo switch connector both fans work properly. But, if I plug it into the thermoswitch itself, they never come on. I've looked for any shorts or wiring issues and I didn't find a single problem.
Any input?
Before the lower radiator hose never got warm, now that I've done everything that I have, it gets hot now.
I've replaced the following.
Radiator
Thermostat
Thermo Switch
Water Pump
Thermostat Housing
Bled System with 50/50
Cooling fan relay
Now, here's where I think my problem lies. My fans will not kick on after running, the temp gauge gets to about 3/4 and they still are not turned on. If I jump the thermo switch connector both fans work properly. But, if I plug it into the thermoswitch itself, they never come on. I've looked for any shorts or wiring issues and I didn't find a single problem.
Any input?
Super Moderator
Joined: May 2010
Posts: 11,834
From: Kenton, TN
When you shut off the car(key off), does the one fan kick on?
Do you have/borrow an IFR temp reader to read the temp of the cyl head?
When it does this, test the resistance of thermo a (switch where the lower hose, t-stat housing is).
Have you tested the rad cap?
Do you have/borrow an IFR temp reader to read the temp of the cyl head?
When it does this, test the resistance of thermo a (switch where the lower hose, t-stat housing is).
Have you tested the rad cap?
Thread Starter
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Member
Joined: Sep 2007
Posts: 109
From:
Fan's do not turn on when car is off.
I do not have access to a IFR reader, are you basically just wanting to know if the head is getting as hot along with the system overheating?
Do you want me to test resistance at about half on the gauge?
Rad cap is tested and have been through 2 of them.
I do not have access to a IFR reader, are you basically just wanting to know if the head is getting as hot along with the system overheating?
Do you want me to test resistance at about half on the gauge?
Rad cap is tested and have been through 2 of them.
Thread Starter
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Member
Joined: Sep 2007
Posts: 109
From:
Just to make sure I am bleeding everything correclty, this is the procedure I am using.
Crack the bleeder screw open, pour coolant into radiator until a steady stream comes out of bleeder screw, shut bleeder screw and top of coolant to base on radiator. Start car with heat all the way up.
This is all when the car is off.
Crack the bleeder screw open, pour coolant into radiator until a steady stream comes out of bleeder screw, shut bleeder screw and top of coolant to base on radiator. Start car with heat all the way up.
This is all when the car is off.
Been Around A Long Time Member
Joined: Sep 2010
Posts: 1,653
From: Tennessee
That is not the way I have done it
Fill radiator up, close cap.
Start car, turn on heat, open bleeder.
Let run till coolant spraying out of bleeder, close bleeder.
Turn off car
Top off coolant tank
Fill radiator up, close cap.
Start car, turn on heat, open bleeder.
Let run till coolant spraying out of bleeder, close bleeder.
Turn off car
Top off coolant tank
Super Moderator : And A Texan
Joined: Feb 2007
Posts: 9,652
From: Katy, TX
From your original post
"Now, here's where I think my problem lies. My fans will not kick on after running, the temp gauge gets to about 3/4 and they still are not turned on. If I jump the thermo switch connector both fans work properly. But, if I plug it into the thermoswitch itself, they never come on. I've looked for any shorts or wiring issues and I didn't find a single problem."
This statement indicates your new? thermoswitch A (on the thermostat housing) is faulty (failed open). When engine is at operating temperature (~194F), about 1/2 way on temp indicator, thermoswitch A should close and enable both fans to run. If you pulled the connector, shorted, and they ran, this confirms thermoswitch A is faulty.
good luck
"Now, here's where I think my problem lies. My fans will not kick on after running, the temp gauge gets to about 3/4 and they still are not turned on. If I jump the thermo switch connector both fans work properly. But, if I plug it into the thermoswitch itself, they never come on. I've looked for any shorts or wiring issues and I didn't find a single problem."
This statement indicates your new? thermoswitch A (on the thermostat housing) is faulty (failed open). When engine is at operating temperature (~194F), about 1/2 way on temp indicator, thermoswitch A should close and enable both fans to run. If you pulled the connector, shorted, and they ran, this confirms thermoswitch A is faulty.
good luck
