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Welcome To Mopar1973Man.Com LLC
We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features. Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.
I'll post this here but I believe this could all lead to the thermostat.
Anyway, not long ago I replaced the heater core and evap. Removed hvac, cleaned, inspected the foam seals and reinstalled.
Now that it's getting cooler outside I'm noticing that it's not putting out the expected heat. I read the heater output write up in the articles section and checked for the movement of the blend door motor, checked to see if the heater hoses were hot indicating flow of coolant, blower motor is functioning as it should. All good.
I have noticed though that when I come to a stop light or if I'm sitting still much more than about 30-45 seconds the engine begins to cool down per that gauge. Like from just above 190° to below 190° (again, on the factory gauge). Temp output at the floor vent is good while fan is on low but cools down considerably when moved to 3 or on high.
I fear that when I really does get cold around here I will not have enough heat output to warm the cab.
When the outside temp was in the 60's the heat output seemed to be in spec with the article. I'm thinking thermostat, any other things I should check out?
The first two pics are going down the road, engine at temp, outside temp was about 45° I think.
Next pic is sitting at a red light, notice the drop in engine temp.
I've been google searching this issue, I've read that it might be possible to have air trapped in the heater core. Anyone heard of this? Is there a certain way to bleed it out?