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> LT1 running too cool...
Steve91T
post Dec 22 2015, 04:38 PM
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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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mr.beachcomber
post Dec 30 2015, 05:58 PM
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Have you checked the temperature sender for accuracy? Just a thought as I haven't found anyone with a similar problem. (Even those with 160F thermostats don't see that much cooling except during the winter.)
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Steve91T
post Jan 4 2016, 09:21 PM
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QUOTE (mr.beachcomber @ Dec 30 2015, 12:58 PM) *
Have you checked the temperature sender for accuracy? Just a thought as I haven't found anyone with a similar problem. (Even those with 160F thermostats don't see that much cooling except during the winter.)


Yeah back when I had a 160 thermostat it would still stay around 170-180. This 180 degree one should stay around 190. I don't get it it. I took temp readings after a drive using my temp gun. The water pump housing, and all coolant hoses were in the 130's and the cylinder head itself was about 180. That's about the temp the water temp gauge was showing.

I'm just running water, no antifreeze. Maybe I'll just pull the sender and see if I can check its accuracy. I have to add some heater core hoses anyway, so that'd be a good time to check it.

Any other ideas though how this could be happening?
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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   I pulled the water temp sender. I heated a cup of ...   Jan 13 2016, 10:14 PM
Blainefab   QUOTE (Steve91T @ Jan 13 2016, 02:14 PM) ...   Jan 14 2016, 09:54 PM
Steve91T   QUOTE (Blainefab @ Jan 14 2016, 04:54 PM)...   Jan 14 2016, 10:06 PM
Blainefab   QUOTE (Steve91T @ Jan 14 2016, 02:06 PM) ...   Jan 15 2016, 12:07 AM
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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