[GMCnet] Coolant Sender and old radiator [message #282899] |
Wed, 22 July 2015 22:46 |
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ljdavick
Messages: 3548 Registered: March 2007 Location: Fremont, CA
Karma: -3
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When installing the fuel injection system I decided it was a great time to replace the old coolant sending unit with the one that uses more of the gauge (different resistance range at temperature). I’ve had it sitting in the drawer for years. Well, I’ve heard not to change too many things at once, and I somehow never heed this advice.
While driving on our shake down trip I felt the pucker of panic once or twice as the temperature gauge crept past 3/4. I did not have the computer hooked up to the fuel injection system which would have put a number on the temperature, but the coach ran well and the temperature came down quickly with less throttle.
Here’s my concern - As I was driving on the freeway, moderately warm temperatures - mid 80’s - if I drove over 65 the temperature would climb. Slowing to 55 or 60 the temp came down nicely. This makes me think that my radiator has some blockage and is not able to dissipate more than the modest heat of freeway driving. So far as I know this is the original radiator. Could this be normal behavior?
Are my concerns justified, and is my reasoning sound?
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, CA
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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Re: [GMCnet] Coolant Sender and old radiator [message #282915 is a reply to message #282899] |
Thu, 23 July 2015 08:07 |
Chris Tyler
Messages: 458 Registered: September 2013 Location: Odessa FL
Karma: 7
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Senior Member |
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Not sure what you mean by the different range. It may not be displaying an accurate temp
Im a big fan of mechanical temp and oil psi gauges
Where is the sensor located?
Mine has 2 temp gauges, one on the engine, one exiting the radiator
76 Glenbrook
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Re: [GMCnet] Coolant Sender and old radiator [message #282937 is a reply to message #282899] |
Thu, 23 July 2015 10:45 |
A Hamilto
Messages: 4508 Registered: April 2011
Karma: 39
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Senior Member |
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ljdavick wrote on Wed, 22 July 2015 22:46When installing the fuel injection system I decided it was a great time to replace the old coolant sending unit with the one that uses more of the gauge (different resistance range at temperature). I've had it sitting in the drawer for years. Well, I've heard not to change too many things at once, and I somehow never heed this advice.
While driving on our shake down trip I felt the pucker of panic once or twice as the temperature gauge crept past 3/4. I did not have the computer hooked up to the fuel injection system which would have put a number on the temperature, but the coach ran well and the temperature came down quickly with less throttle.
Here's my concern - As I was driving on the freeway, moderately warm temperatures - mid 80's - if I drove over 65 the temperature would climb. Slowing to 55 or 60 the temp came down nicely. This makes me think that my radiator has some blockage and is not able to dissipate more than the modest heat of freeway driving. So far as I know this is the original radiator. Could this be normal behavior?
Are my concerns justified, and is my reasoning sound?
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, CA You didn't say if the fan came on or not. If the fan and thermostat are working, it SHOULD get to a set temperature and stay there. On a hard pull it might go up enough to see, but not much.
How it is supposed to work: The thermostat gets the engine up to temperature. If it needs to dissipate more heat, the thermostat opens. Lots more heat and the fan comes on. If the gauge moves down below the thermostat setting, the thermostat is open too much. If it goes more than a little above the thermostat setting, it means the system is not cooling like it is supposed to. You need numbers to figure out if the swings you are seeing are due to the thermostat being open at too low a temp, or it is actually having a hard time cooling.
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