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Old 09-18-2017, 06:48 PM   #1
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heat on...but not "hot"

The temps dropped enough this past weekend where we needed the heat on while driving home.

I had the heat cranked, it was "warm" but not Hot like it should be.
V10 Ford is running at normal temp it always does, at half on the gauge.

Any thoughts?

Thanks in advance.

Dave
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Old 09-18-2017, 07:22 PM   #2
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A core blockage is my first thought. Second would be the rad cap is not holding proper pressure. Third is engine thermostat not working properly. Fourth would be low coolant.
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Old 09-18-2017, 07:29 PM   #3
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Entertain me--put the dash air controls on max air conditioning, yes--max AC, and turn the heat selector to full heat. Let me know if heat improves?????? In many rigs, this set-up improves air flow and recirculates inside air to be heated vs trying to continually heat outside air.....If so equipped, designed; check the h-valve to make sure it is fully open and providing hot coolant to heater core.
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Old 09-18-2017, 08:07 PM   #4
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This January in Colorado in the upper 20s low 30s our engine seems to never blow hot.
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Old 09-19-2017, 09:33 PM   #5
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another option may be your mixer valve that goes from heat to air. I just had to replace the motor on my wifes jeep. just saying.
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Old 10-01-2017, 07:58 AM   #6
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If you have an A Class Motorhome, if you check under the hood, you will find that the heat ducts are made of flexible plastic 4" hoses. The cold exterior air blows over the flexible hoses, cooling the air flow inside them. This results in only warm air entering Motorhome. In cold weather ( we are in Canada), we turn the Defrosters on the windshield to keep it clear, start the generator, and set your thermostat to your desired temperature and drive in comfort to your destination. Will also keep your wet bay and tanks in basement from freezing if it's real cold outside. One other note; if it's real cold outside, don't push your recirculating button on, or you windshield will fog up from humidity inside. If it's not that cold outside, turn recirculating button on will help it get warmer inside.
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Old 10-01-2017, 08:13 AM   #7
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Walkerkb2--sounds like you have more of a geography challenge than a heater problem--just head south until it stops snowing [smile].......
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Old 10-01-2017, 08:55 AM   #8
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The most common cause of this is either a partially open air-mixing door in the dash system (outside air is mixing with the heated air) or the valve that gates hot water through the heater core is not fully open. They can sometimes stick either open or closed.

Is this a new problem or have you never had enough heat from this rigs HVAC? Motorhome heaters are undersized for the size of the passenger area and chilly air from the rest of the coach keeps the heat value down. Running the system on recirculate (max) helps, but the real solution may be to run the house furnace or roof heat pumps to provide more general warmth inside.
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Old 10-01-2017, 10:13 AM   #9
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Quote:
Originally Posted by 60sumtin View Post
A core blockage is my first thought. Second would be the rad cap is not holding proper pressure. Third is engine thermostat not working properly. Fourth would be low coolant.
Since the OP stated that his temp gauge was showing normal, those would not be the first things i'd check. There's a good chance the heater control valve isn't actuating properly. Could be the valve itself or a vacuum line going to it. Get under the hood and visually look at it to see if it moves when the thermostat inside the cab is moved between cool and heat settings.

As Gary stated, it could also be a damper malfunction that's causing the problem. Again, a vacuum line may be the culprit. Check for leaks via deteriorated or loose vacuum lines.
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Old 10-01-2017, 12:39 PM   #10
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Sounds like your problem is with heater hose valve but another thought is what temp is your engine thermostat, if is 160 degree you might think about changing to 180 or 190 degree stat.

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Old 10-01-2017, 12:57 PM   #11
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I added some coolant that seemed to help a little bit... Still have to take it for a good run and see if it heats up.
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