No heat at low RPMs - Nissan Frontier Forum
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#1 (permalink) Old 11-23-2008, 11:04 PM
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No heat at low RPMs

I fired up my 06 SE then ran back in the house. It was colder than a mother-in-law's kiss so I thogut I'd let her warm up. I went back out 5 minutes later and the windows were still frosted?!?!?!?
I drove off after scraping them but as the RPMs picked up, I got heat!! When I stopped and let it sit at idle, I lost heat!?!? Even thoug I get heat once I'm driving, I can actually feel a drop in the temp when it kicks into O/D (rpms drop).
I checked the fuid level in the rad and it was down about a quart. Although that isn't much, I'm wondering where it went?
After being topped up, it's exactly the same!!
Could it be my water pump? I can't find any leaks and the oil is not contaminated so...............?
At 50,000 miles, it should be under warrentee right?
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#2 (permalink) Old 11-23-2008, 11:11 PM
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air bubble in the heater core. D40 is extremely sensitive to coolant levels. You should be hearing a gurgling sometimes while driving as well.

overfill (aka fill it up) the overflow bottle, it usually gets the air out. always did for me on my D40 anyway.

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#3 (permalink) Old 11-23-2008, 11:12 PM
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MY first guess was low coolant. Could be a clogged up heat exchanger. I dunno how the actuators are on the frontiers, but fords have a flap that opens up to allow the hot air in and they are real bad about getting gummed up and not opening/closing....

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#4 (permalink) Old 11-23-2008, 11:16 PM
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Thanks, I'll try overfilling the reservoir. Much appreciated.
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#5 (permalink) Old 11-23-2008, 11:19 PM
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no this normal as far as i know. When i went to this years west meet in California this year we camped out in the desert over night in October. It was freezing that night. I was inside the truck with the heat blasting and i got no heat what so ever. Even when i reved the engine to get the temp gauge to go up, nothing. Unless.... theres load on the engine. I'm not the only one, when we all woke up in the mourning me, penksi, and nat where *****ing about this lil issue

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#6 (permalink) Old 11-23-2008, 11:19 PM
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Wait....if it was the heat exchange actuator, why is there lots of heat at high rpms and why is it relative to the rpms? Don't get me wrong. If I knew my stuff, I'd have it fixed by now. I appreciate any and all input.

I hear yuh, but I went through all of last winter up here in Canada and I got tons of heat - NO problem. Now, all of a sudden......????

Last edited by Uplander; 11-23-2008 at 11:23 PM. Reason: Automerged Doublepost
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#7 (permalink) Old 11-24-2008, 12:33 AM
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It's finally gotten cold here and mine has been heating up just fine while idling. Is your temp gauge swinging up and down the range while you drive?


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#8 (permalink) Old 11-24-2008, 12:35 AM
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D40 has a dummy temp guage remember that guys.

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#9 (permalink) Old 11-24-2008, 12:59 AM
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Quote:
Originally Posted by Inyourface1650 View Post
D40 has a dummy temp guage remember that guys.


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#10 (permalink) Old 11-24-2008, 01:05 AM
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Does the recirculate button being off have anything to do with the lack of airflow at stops? I can't remember the last time I used the heater so not sure.
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