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 LT1 coolant temp

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autoarcheologist

autoarcheologist

Posts : 295
Join date : 2014-08-22
Location : Portland, OR

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PostSubject: LT1 coolant temp   LT1 coolant temp Icon_minitimeThu Nov 20, 2014 12:41 am

The previous owner of our '94 Roadmaster claims that he had a lower temp thermostat put in the engine when the water pump was replaced a few years ago.

The dash gauge never reads in the middle, it always seems to settle right around 3/8 (I don't remember exactly which mark, but less than 1/2) which would support his claim.

But when I check the temp through the climate control module it says 180 when warmed up.

That sounds like it has the correct 180 degree thermostat in it. Right?

If it's a 160 I'd like to replace it, but if it's the correct 180 I will leave it alone.

Can anybody else confirm this is where their LT1 with a 180 thermostat runs?
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jayoldschool

jayoldschool

Posts : 2544
Join date : 2009-06-14

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeThu Nov 20, 2014 2:42 pm

The position of the needle is almost irrelevant. You can check the actual temperature of the coolant by accessing the diagnostics in the HVAC controls.
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autoarcheologist

autoarcheologist

Posts : 295
Join date : 2014-08-22
Location : Portland, OR

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeThu Nov 20, 2014 4:05 pm

Right, that's what I did. I am just used to oem gauges thatbsit right in the middle tt normal operating temp. Hence my confusion.
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jayoldschool

jayoldschool

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Join date : 2009-06-14

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeThu Nov 20, 2014 7:15 pm

All of mine have read about the same as yours, left of middle.
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autoarcheologist

autoarcheologist

Posts : 295
Join date : 2014-08-22
Location : Portland, OR

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeThu Nov 20, 2014 7:56 pm

Cool, good to know! I can check that off. But I should still probably replace the coolant hoses at some point.
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scoffman

scoffman

Posts : 553
Join date : 2012-02-21
Age : 42
Location : Lawrenceburg, KY

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeFri Nov 21, 2014 1:36 pm

Mine's a 93 but her gauge never went above the 1/4 mark. Except for today when the water pump decided to take a crap at highway speeds and the gauge shot up to the half way mark before I could get Ms. Roadie over to the side of the road without power steering, cause the belt jumped off.
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autoarcheologist

autoarcheologist

Posts : 295
Join date : 2014-08-22
Location : Portland, OR

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeFri Nov 21, 2014 3:12 pm

Yikes! Hope you get it sorted quickly and it's just a belt. Any signs of bent pulleys?
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buickwagon

buickwagon

Posts : 951
Join date : 2011-06-10
Location : Muskoka, Ontario

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeFri Nov 21, 2014 7:39 pm

I have noticed that the temp gauge on the dash actually reads a bit higher in cold weather for some reason. I'm guessing that the thermostat doesn't have to open fully, leading to a slight increase in temperature in the area of the dash temp gauge sender.
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scoffman

scoffman

Posts : 553
Join date : 2012-02-21
Age : 42
Location : Lawrenceburg, KY

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeMon Nov 24, 2014 1:45 pm

yeah the bearing in the water pump took a dirt nap. Got a new pump installed and she's back up and running again.
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jayoldschool

jayoldschool

Posts : 2544
Join date : 2009-06-14

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeMon Nov 24, 2014 2:26 pm

buickwagon wrote:
I have noticed that the temp gauge on the dash actually reads a bit higher in cold weather for some reason. I'm guessing that the thermostat doesn't have to open fully, leading to a slight increase in temperature in the area of the dash temp gauge sender.

A reason for that can be no AC use. Putting the AC on runs the fans, bringing temps down.
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71novaguy



Posts : 233
Join date : 2014-01-14

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeMon Nov 24, 2014 8:38 pm

Think a variable resistor could be put inline like the fuel gauge? You could read the temp on the computer and make an adjustment until the gauge reads correct
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lakeffect
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lakeffect

Posts : 3889
Join date : 2009-08-18
Location : Rochester NY 14621

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeMon Nov 24, 2014 9:04 pm

I have yet been able to dial in the fuel gauge using the variable resistor.  The little blue one from radio shack is too flimsy  ( breaks easily) and too sensitive to minute change. might work better with a potentiometer closer to the actual value needed. You'd get less sensitivity to the angular change of the knob. The it's too easy to sweep right past the setting you need. they make a 1k and 10k version. I'm not sure I've tried in the past. The 1k would seem the better bet

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buickwagon

buickwagon

Posts : 951
Join date : 2011-06-10
Location : Muskoka, Ontario

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeMon Nov 24, 2014 9:10 pm

Get a "10-turn" potentiometer. Great for fine adjustments because they are literally 10 turns from 0 to the uppermost limit.
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lakeffect
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lakeffect

Posts : 3889
Join date : 2009-08-18
Location : Rochester NY 14621

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeTue Nov 25, 2014 12:04 am

Got an example (pic) to show what we might be looking for, or a link?


Many thanks for the info.
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buickwagon

buickwagon

Posts : 951
Join date : 2011-06-10
Location : Muskoka, Ontario

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeTue Nov 25, 2014 3:37 am

Here's the first two that popped up when I googled "10 turn potentiometer":

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lakeffect
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lakeffect

Posts : 3889
Join date : 2009-08-18
Location : Rochester NY 14621

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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitimeTue Nov 25, 2014 7:44 am

Thanks , those look considerably more rugged than the ones from Radiosmack

Dave.
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PostSubject: Re: LT1 coolant temp   LT1 coolant temp Icon_minitime

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