Need better heat. 205° thermostat ?
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Veteran
Joined: Apr 2019
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The blend door lets outside air in to help control the temperature. There are seals on it that deteriorate over time that may be allowing cold air to get into your truck during the winter and negating the warmth of the heater core. In your case, I would check those heater hoses to determine what the temperatures are going into and out of the heater core with the heater blower running on high. I would also change the thermostat and be sure to use a high quality thermostat, such as a 195 degree Stant Superstat. You can pickup a temperature gun pretty cheap at Harbor Freight - https://www.harborfreight.com/infrar...ter-93984.html
so it may be the blend door then? How do i test it ? Also im in canada so don't have Harbour freight but do have napa. What temp should my heater hoses be running at ?
Grand Champion
Joined: May 2019
Posts: 5,158
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From: S.W. Indiana
Right now in the summer if I set the truck to hot setting it runs hot. Last Christmas was -30 out and was on the highway, the truck barely ran Luke warm to keep the windshield defrosted ! I have a grill cover and cardboard infront of the rad to keep it as warm as I can. Both hoses are new, I bought a better shape rad from the wreckers and the heatercore was done recently aswell. There is a 195 degree thermostat in there now would a 205 degree help ? It's been awhile since thermostat was done so maybe try that ? I have a spill free funnel kit and tried raising the truck up and burped the coolant as best as I could to prevent air lock. Heater core hoses seem fine aswell. The truck is a 96 with the 5.9 but has a rebuilt 2001 motor in it. I had to tap in the second sensor for the gauge so I could actually read my temperature. For whatever reason it always stays a little above the middle mark when at operating temp. What else can it be? I need proper heat this winter, it blows my mind why it works right now but not when it's cold. Any help is appreciated Thank you !
How many miles on the engine. Specifically, how many miles on the timing chain. It's a bit of a pain to check on the second gen trucks because the distributor is under the cowl, but if you rotate the engine backwards by hand, and it goes more than 5 degrees, you may have slop in the timing chain. I had a '94 with the V-6 and it had major slop in the timing chain. When I replaced it, the temperature went right to normal fast, my fuel mileage went up significantly and the heater would cook you. Before, it was kind of warm, but not very.
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Veteran
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How many miles on the engine. Specifically, how many miles on the timing chain. It's a bit of a pain to check on the second gen trucks because the distributor is under the cowl, but if you rotate the engine backwards by hand, and it goes more than 5 degrees, you may have slop in the timing chain. I had a '94 with the V-6 and it had major slop in the timing chain. When I replaced it, the temperature went right to normal fast, my fuel mileage went up significantly and the heater would cook you. Before, it was kind of warm, but not very.
Truck was rebuilt with performance parts 4 yeaes ago so not worried about slop. It gets up to temperature it's just not blowing hot.
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I just bought one. Do you know roughly what temp the hoses should be at?
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Veteran
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Sorry I forgot to add. This haS the 195 thermostat and heat blasting on high
Champion
Joined: Sep 2012
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From: Central VA
Might want to do some further checking on your blend door to ensure its fully closing. If it's not fully closing & sealing in the winter, this could be contributing to your theft of heat in the cold Canadian winter... Read down in this thread (https://dodgeforum.com/forum/2nd-gen...djustment.html) and see Keith L's suggestion about the blend door cable.
Grand Champion
Joined: May 2019
Posts: 5,158
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From: S.W. Indiana
195 is what the engine and computer are designed to use. That's what you want. How old is your radiator cap? You can borrow a radiator cap tester. If it's not holding pressure, you'll run less heat. The old non-pressurized systems in the 1930's and so had heat but not like you need. It's probably good, but something to eliminate.
