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10-03-2011, 10:39 PM
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#1 |
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Registered User
Join Date: Dec 2010
Location: auburn ne
Posts: 230
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temperature gauge fluctuates?
hey all,
so today i finally decided to replace my heater core and put a thermostat back in. i got everything done and filled it all back up with a 50/50 mix and let it run till the thermostat opened and added coolent as needed and what not. the temperature seemed right, bout 195 or so it opened and dropped back down to 160 or so then came up some and leveled out bout 180 or so but after driving a little it seems like it comes up to about 190/195 then drops to about 160/165 and just kinda every 20/30 seconds it goes back and forth. i had the heater on high the whole time threw out all of this but dont see why its flucuates so much?
__________________
85 GMC sierra classic : 350, 4spd, 205, 3.42s, 35s 
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10-04-2011, 06:10 AM
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#2 |
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Registered User
Join Date: Aug 2009
Location: S.C.
Posts: 1,593
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Re: temperature gauge fluctuates?
What temp is your thermostat? Mine used to fluctuate between open/close, trying to maintain temp. Especially noticeable when it's really cold.
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'86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold  )I'm kinda like duct tape- no real purpose, but handy to have around. |
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10-04-2011, 08:29 AM
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#3 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,310
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Re: temperature gauge fluctuates?
it could be a defective thermostat.. ive seen that happen more than once
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Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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10-04-2011, 08:49 AM
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#4 | |
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Laid Back
 
Join Date: Apr 2010
Location: mcloud ok
Posts: 2,658
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Re: temperature gauge fluctuates?
Quote:
Posted via Mobile Device
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72 chevy swb Direct dealers for.. Vintage Air, Porterbuilt, Billet Specialties,Budnik wheels ,eddie motorsports, raceline wheels, intro wheels, Dakota Digital, precision, unisteer, Trimparts, and many many more... Laid Back Recreations.. Full restoration shop and full paint and body.. Kyle http://67-72chevytrucks.com/vboard/s...d.php?t=574629 |
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10-04-2011, 10:11 AM
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#5 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: temperature gauge fluctuates?
we lose heat as the air goes threw the rad
if the air is cooler fall/winter you will lose even more heat from the rad i cover mine after the temp drops to 0 or 32 for you
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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10-04-2011, 11:15 AM
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#6 |
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Registered User
Join Date: Dec 2010
Location: auburn ne
Posts: 230
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Re: temperature gauge fluctuates?
oh well its a 195 thermostat and it was about oh i dont know 55-65 outside maybe a little hotter colder give or take lol, it does seam like its just opening and closeing so maybe it is just a bad thermostat idk thanks for your opinions.
__________________
85 GMC sierra classic : 350, 4spd, 205, 3.42s, 35s
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