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Author Topic: Thermostat and heater hose  (Read 1737 times)

Offline Customdeluxe81

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Thermostat and heater hose
« on: July 26, 2021, 10:30:18 AM »
Can anyone tell me what thermostat my 1981 C10 with  250 6cylinder non ac takes? I’m thinking 180 but parts store says 195. Also does anyone know what size heater hose it takes? Is it 3/4 and 5/8 or something else ? Hoses are rough and I can’t find any markings on them.
Thanks
Bill
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Offline Shifty

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Re: Thermostat and heater hose
« Reply #1 on: July 26, 2021, 10:44:56 AM »
The 195 is for emission laws, and most vehicles will run cleaner when warmer.  I prefer a 180 on most of my things, though I've run a 160 on a few.

Heater hoses are indeed 5/8 and 3/4. 
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87 R30 3+3 Longbed (days of yore)

98 C2500 ext cab longbed

Offline bd

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Re: Thermostat and heater hose
« Reply #2 on: July 26, 2021, 10:53:51 AM »
195° F, 5/8", 3/4"
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline Customdeluxe81

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Re: Thermostat and heater hose
« Reply #3 on: July 26, 2021, 11:04:27 AM »
Thanks, that’s what I needed to know!
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Offline Customdeluxe81

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Re: Thermostat and heater hose
« Reply #4 on: July 26, 2021, 12:26:37 PM »
Any thoughts on how to get more heat from this? New heater core? Do the aluminum heater cores put out more heat?
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Offline bd

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Re: Thermostat and heater hose
« Reply #5 on: July 26, 2021, 01:03:51 PM »
If the truck still has the original core, it is more than likely clogged to some degree.  Thorough flushing of the cooling system followed by a new 195° F thermostat, 50/50 antifreeze mix, and a new core should produce a significant improvement in heater function.
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Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)
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