Need more heat

Discussion in 'Engine Performance + Maintenance' started by nhyrum, Nov 29, 2019.

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  1. nhyrum

    nhyrum OBS Enthusiast

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    Not sure if this is 100% the right place, so if not, I apologise.

    The heater in my truck isn't the greatest. Last fall I replaced the water pump, thermostat with a 205 for the winter, and hoses going to the heater core, and back flushed the core multiple times. The year before that, before I owned the truck, the heater core was replaced at a shop, but the dumb *explative deleted* shop busted the latch that holds the core in place, so I've had to fabri-cobble up a way to keep it in place.

    This fall I replaced freeze plugs, so the coolant has been flushed and replaced with new, I've put new, or hoses and fittings, including that one everyone hates, and a piece of card board over the grille. I've got the 4.3, and iirc, the same radiator is used for the 350(truck is a 95) the thermostat is functioning, I've verified with my own two eyeballs, and I can verify with the temp gauge, that is pretty accurate, even though it's just a gauge. Once "warm" and driving, the temp will climb to the 210 mark, the thermostat will open, and the temp falls to the 155 ish mark, then repeat. And even at the 210 mark, the heat at the vent isn't super warm, but enough to keep the cab warn ish, but even boring l blowing right on my feet, it never gets to where they're uncomfortably warm, or result even just warm.

    I've checked and verified that the blend door actuator works, and that the door moves.

    Any way to get more heat from her? Winter is about to really settle in, where days won't even get above 0F, so I would like to be able to get my feet warm

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  2. L31MaxExpress

    L31MaxExpress I'm Awesome

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    It should not temperature cycle like that. Try a new thermostat and don't cheap out on it. Get a quality one like a Stant. Once up to temp the temp should be very stable.

    As far as not enough heat when it is at 210°F Its possible you have a jammed blend door that is not closing properly.

    I have driven my Express van in 10°F weather. With a 170°F thermostat and running under 180°F it would cook you out of the van. To the point you would have the temperture knob under 1/2.
     
  3. Supercharged111

    Supercharged111 I'm Awesome

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    My trucks will cook you out and both have 180 stats. With a new heater core, something else is definitely wrong with your truck. That or you're from the tropics and moved to a winter wonderland?
     
  4. nhyrum

    nhyrum OBS Enthusiast

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    It is a stant. It only does that in the winter, when sub zero air is blasting through the radiator. The thermostat opens, and all the cool water begins circulating, closing the t stat. At least that's my way of thinking, and I don't BELIEVE it's sticking.

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  5. Supercharged111

    Supercharged111 I'm Awesome

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    It shouldn't stay open until it's stone cold, it should modulate the flow to maintain a steady temperature.
     
  6. 454cid

    454cid Sooper Pooper

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    If that temp gauge is rising and then falling that much, I'd guess it's low on coolant. If not that, then I'd suspect faulty thermostat.... taking too long to open and then staying mostly open.

    Do you have a bare steel floor? That can really suck the heat out of a truck very quickly.
     
  7. nhyrum

    nhyrum OBS Enthusiast

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    Not bare steel, but rubber

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  8. Hutchinson

    Hutchinson OBS Enthusiast

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    Yeah man, mines got a 180 stat in it, and will slap cook you out of it. Last couple winters I was working up in Ohio, (I work Construction, building power plants around the world), negative degrees outside, get halfway to work and realize, “hey dummy, turn the heat down,....your sweating”.

    The temp gauge drops down maybe 5-10 degrees when the stat first opens up, but, a couple minutes later, it’s right back on regular running mark.
     
  9. Hutchinson

    Hutchinson OBS Enthusiast

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    Y’all ever drop a room temperature (say 70 degrees) stat in a pot of boiling water? It takes a 1-2 minutes to fully open up. I tested one once, thought my stat wasn’t opening.
     
  10. L31MaxExpress

    L31MaxExpress I'm Awesome

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    Yep! Only time my temp even wavers is at WOT. When you first stand on it the water pump forces cold water into the engine. It drops about 10°F and quickly recovers.
    I even have the dual core 34" wide 454/8.1 big block radiator.
     

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