Cooling system help
Pro Wrench
Joined: Dec 2016
Posts: 1,603
Likes: 229
From: Fall City, WA
Easy way to check heater core is to see if both hoses going through the firewall are the same temp. If one is significantly colder, it means blocked heater core.
Pro Wrench
Joined: Dec 2016
Posts: 1,603
Likes: 229
From: Fall City, WA
If you have one of the old T-Stats, put it in pot of water with a thermostat and watch to see if it opens up when the water gets to 180 or 190.
Or...if you have an ultra gauge or code reader that allows you to see the coolant temp do this
1. Let truck idle for 10 minutes (or till truck is fully warmed up)
2. Check the current coolant temp
3. turn off the cabin heater unit
4. rev engine to 3k rpm and hold for 1 minute
5. check the new coolant temp, if it did not go down the T-Stat is bad. If it did go down tell me how much
Or...if you have an ultra gauge or code reader that allows you to see the coolant temp do this
1. Let truck idle for 10 minutes (or till truck is fully warmed up)
2. Check the current coolant temp
3. turn off the cabin heater unit
4. rev engine to 3k rpm and hold for 1 minute
5. check the new coolant temp, if it did not go down the T-Stat is bad. If it did go down tell me how much
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TReK
Joined: May 2011
Posts: 2,768
Likes: 396
From: kitchener, canada
I tried that minus putting Tstat in boiling water
temp dropped 2 degrees nothing major
I will take it all apart flushed it again and put another brand new stat in
will report back in 2 hours
temp dropped 2 degrees nothing major
I will take it all apart flushed it again and put another brand new stat in
will report back in 2 hours
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TReK
Joined: May 2011
Posts: 2,768
Likes: 396
From: kitchener, canada
I know new Tstat installed same result
the thermostat with the nipple that goes straight up goes to to hose where bleed is correct ?
Nipple that is on a angle goes to short hose to block correct ?
the thermostat with the nipple that goes straight up goes to to hose where bleed is correct ?
Nipple that is on a angle goes to short hose to block correct ?
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TReK
Joined: May 2011
Posts: 2,768
Likes: 396
From: kitchener, canada
Holllllyy I think I got it thanks to that drawing above
the little hose off top of rad to expansion tank
well someone put a bigger hose about 2 feet to long was half way down the rad creating a huge trap
lifted it up now getting 201 f city driving with Atlantic b t stat
now let's see what the lucky 8 stat will do
off to parts store to get correct size vent hose
the little hose off top of rad to expansion tank
well someone put a bigger hose about 2 feet to long was half way down the rad creating a huge trap
lifted it up now getting 201 f city driving with Atlantic b t stat
now let's see what the lucky 8 stat will do
off to parts store to get correct size vent hose
Rock Crawling
Joined: Jun 2016
Posts: 374
Likes: 66
From: Virginia
That hose being too long could cause air. It may appear bigger, but it's the inside diameter that matters. Inspect the hose and trim the length, but as long as the inside diameter is correct a thicker diameter is fine.