 LT1 running too cool... |
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 Dec 22 2015, 04:38 PM
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#1
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Experienced Member  Group: Advanced Members Posts: 2,038 Joined: 3-March 10 From: Huntersville, NC Member No.: 9,105  |
So I've been putting some miles on this engine after it sat for years and I've got a problem that I would like some help with. It's got a new water pump and thermostat, for now the heater hoses are capped off. I'm running a manual fan switch. The water temp gauge is in the drivers should side head.
So everything seems normal except for some reason if I drive down the highway my water temp will drop to about 150 degrees. It acts like the thermostats is stuck open. Yesterday I pulled the t-stat and put it in a pot of water and watched it. It started opening at 180 degrees like it should, then closed when it cooled down. So why is this happening? |
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Jan 13 2016, 10:14 PM
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#2
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Experienced Member Group: Advanced Members Posts: 2,038 Joined: 3-March 10 From: Huntersville, NC Member No.: 9,105 |
I pulled the water temp sender. I heated a cup of water to 190 degrees and dropped the sensor in and watched the gauge. It climbed quickly to exactly 190 degrees. I measured the temp of the water using a very accurate instant read meat thermometer.
So, something must be hooked up wrong. Incorrect heater hose routing or something? Would that cause this? If I'm at a light and the temp gets to 200, within minutes of cruising down the road, it'll drop to 150 or so. Something is wrong, just not sure what. |
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Jan 14 2016, 09:54 PM
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#3
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I build race cars Group: Advanced Members Posts: 4,748 Joined: 31-August 05 From: Central coast, CA Member No.: 874 |
QUOTE (Steve91T @ Jan 13 2016, 02:14 PM)  If I'm at a light and the temp gets to 200, within minutes of cruising down the road, it'll drop to 150 or so. Something is wrong, just not sure what. How are you measuring coolant temp - ie what gauge and where is the sensor located? |
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Jan 14 2016, 10:06 PM
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#4
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Experienced Member Group: Advanced Members Posts: 2,038 Joined: 3-March 10 From: Huntersville, NC Member No.: 9,105 |
QUOTE (Blainefab @ Jan 14 2016, 04:54 PM) QUOTE (Steve91T @ Jan 13 2016, 02:14 PM) If I'm at a light and the temp gets to 200, within minutes of cruising down the road, it'll drop to 150 or so. Something is wrong, just not sure what. How are you measuring coolant temp - ie what gauge and where is the sensor located? Drivers side of the head. Autometer elite gauges. The sensor is reading accurate. I tested the sensor with a cup of hot water. |
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Jan 15 2016, 12:07 AM
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#5
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I build race cars Group: Advanced Members Posts: 4,748 Joined: 31-August 05 From: Central coast, CA Member No.: 874 |
QUOTE (Steve91T @ Jan 14 2016, 02:06 PM) QUOTE (Blainefab @ Jan 14 2016, 04:54 PM) QUOTE (Steve91T @ Jan 13 2016, 02:14 PM) If I'm at a light and the temp gets to 200, within minutes of cruising down the road, it'll drop to 150 or so. Something is wrong, just not sure what. How are you measuring coolant temp - ie what gauge and where is the sensor located? Drivers side of the head. Autometer elite gauges. The sensor is reading accurate. I tested the sensor with a cup of hot water. Is the new thermostat an LT1 specific model? It is different than a std SBC thermostat, effectively has 2 valves. |
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Posts in this topic
Steve91T LT1 running too cool... Dec 22 2015, 04:38 PM
Steve91T Any ideas? I'm going to hook up the heater cor... Dec 28 2015, 05:01 PM mr.beachcomber Have you checked the temperature sender for accura... Dec 30 2015, 05:58 PM
Steve91T QUOTE (mr.beachcomber @ Dec 30 2015, 12:5... Jan 4 2016, 09:21 PM Steve91T QUOTE (Blainefab @ Jan 14 2016, 07:07 PM)... Jan 15 2016, 01:15 AM Steve91T So I hooked up the heater core, I now have heat. W... Jan 13 2016, 10:56 PM Blainefab QUOTE (Steve91T @ Jan 13 2016, 02:56 PM) ... Jan 14 2016, 02:02 AM Steve91T QUOTE (Blainefab @ Jan 13 2016, 09:02 PM)... Jan 14 2016, 03:54 AM slowTA QUOTE (Steve91T @ Jan 13 2016, 05:56 PM) ... Jan 14 2016, 10:50 AM Steve91T QUOTE (slowTA @ Jan 14 2016, 05:50 AM) QU... Jan 14 2016, 02:33 PM Blainefab No misread - I edited it to clarify as low tempera... Jan 14 2016, 05:19 AM Steve91T QUOTE (Blainefab @ Jan 14 2016, 12:19 AM)... Jan 14 2016, 05:44 AM Steve91T Fixed!!!
I don't get it. The... Jan 19 2016, 07:46 PM Smitty2919 Main difference I see is the spring on the bottom.... Feb 2 2016, 07:28 PM Steve91T QUOTE (Smitty2919 @ Feb 2 2016, 02:28 PM)... Feb 2 2016, 09:59 PM Smitty2919 Looks like you have LT1 specific Thermostats:
St... Feb 4 2016, 05:12 PM |
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