Problem: No heat from heater

[bear15]

Today we noticed that we have no heat coming from the heater. Does anyone know if there is a fuse that may be causing this problem? Any help would be appreciated.

Best, Ed

[qbee42]

<div class='quotetop'>QUOTE(bear15 @ Jul 21 2007, 08:05 AM) [snapback]482726[/snapback]</div>

Today we noticed that we have no heat coming from the heater. Does anyone know if there is a fuse that may be causing this problem? Any help would be appreciated.

Best, Ed
[/b]

Is the fan not working, or is there cold air blowing?

Tom

[IsrAmeriPrius]

To help diagnose the problem, it would help to know if this is a first or second generation Prius.

[Bill Merchant]

Welcome to PriusChat, bear15. The above are good questions.

I'm going to assume you're driving a Gen 2. The climate screen lets you control the air conditioning system, which includes both heating and cooling. Assuming you are in the northern hemisphere where it is generally warm this time of year, your Prius is smart enough to not give you heat unless you really ask for it. Set the cabin thermostat as high as it will go and the fan on M. You should have heat and the Internal Combustion Engine (ICE) should turn on. Most of the cabin heat comes from the ICE, though there are two electric heaters in the coil.

And yes, there is a fuse, for both the fan and the electric heaters. The fuses are identified with their locations in your manual.

[bear15]

Hi, Thanks for the response. Yes, we have a Gen 2. We live in Northern IL and last night we had temp's in the 40's (a bit surprising). We did set the heater as you suggested but we did not receive any warm heat. Unfortunately, we do not have a manual which we plan on getting. Could you please explain where the fuse is for the electric heaters (the fan works fine).

Any suggestion would be appreciated.

Cheers, Ed

<div class='quotetop'>QUOTE(Bill Merchant @ Jul 21 2007, 07:44 PM) [snapback]482961[/snapback]</div>

Welcome to PriusChat, bear15. The above are good questions.

I'm going to assume you're driving a Gen 2. The climate screen lets you control the air conditioning system, which includes both heating and cooling. Assuming you are in the northern hemisphere where it is generally warm this time of year, your Prius is smart enough to not give you heat unless you really ask for it. Set the cabin thermostat as high as it will go and the fan on M. You should have heat and the Internal Combustion Engine (ICE) should turn on. Most of the cabin heat comes from the ICE, though there are two electric heaters in the coil.

And yes, there is a fuse, for both the fan and the electric heaters. The fuses are identified with their locations in your manual.
[/b]

[9G-man]

Fuse #17 located below the intr. panel/steering wheel, is the one you'd want to check.

I'm just curious, what temperture did you set in the climate control system when you tried to turn on the heat?

How long, or short of a drive did you make when you had no heat?

[richard schumacher]

Getting the owner's manual *and* the Prius Maintenance Guide is highly advised. There's info in both you need, stuff that is not conveniently condensed in priuschat. They may be available in .pdf form somewhere, but it not then buy them from a Toyota dealer.

[donee]

Hi All,

I actually have the reverse problem. And wish there was a button like the A/C button on the Climate screen to disable the heater.

Driving home in high 80's F weather, I have the AC enabled and set to 80. Then I get home, and disable the AC.

In the morning, I start up the car, and forget I left the automatic temperature set to 80 F. And a few minutes down the road, wonder why its so warm in the car, when its 50 F outside!!

If there was a Heater button, I could disable heat all summer - which would allow me to stay in automatic more often. Instead, on the 45 degree mornings, I just turn off automatic controls off, and set ventilation to recirculate. Warms up in minutes. All that electronics - ya know.

Being near the ocean, the Japanese probably do not realize some areas get the highly variable Afternoon to morning temperature changes.

[bear15]

Thanks for the information. Now we know that another fuse box is located as you described. Fuse #17 states "panel." To be on the safe side, we removed and carefully checked all fuses in this location. All look good.

We set the heater at various settings including Max. heat. We tried to get heat while it idled, during a 15 min. trip to and from a location and then at idle again. Any more suggestions?

Thanks for your consideration. Cheers, Ed


<div class='quotetop'>QUOTE(9G-man @ Jul 22 2007, 12:25 AM) [snapback]483074[/snapback]</div>

Fuse #17 located below the intr. panel/steering wheel, is the one you'd want to check.

I'm just curious, what temperture did you set in the climate control system when you tried to turn on the heat?

How long, or short of a drive did you make when you had no heat?
[/b]

[wiiprii]

Hi All,

I actually have the reverse problem. And wish there was a button like the A/C button on the Climate screen to disable the heater.

The heater doesn't come on unless the temp you select is above the temp in the cabin.

Driving home in high 80's F weather, I have the AC enabled and set to 80. Then I get home, and disable the AC.

I use the Auto A/C button on the steering wheel, and turn it off when I get home. Easy and works well for me.

In the morning, I start up the car, and forget I left the automatic temperature set to 80 F. And a few minutes down the road, wonder why its so warm in the car, when its 50 F outside!!

When you hit the Auto A/C button, the MFD tells you the temp that is currently selected. I usually never have to select 80 degrees here in the Seattle area, even when it's really hot, I find 75-78 works for me.

If there was a Heater button, I could disable heat all summer - which would allow me to stay in automatic more often. Instead, on the 45 degree mornings, I just turn off automatic controls off, and set ventilation to recirculate. Warms up in minutes. All that electronics - ya know.

Again, just use the temp toggle on the lower left of the wheel to turn the temp down after you hit the Auto A/C button. And you don't want to use recirculate unless you're running the A/C or the inside of your car will eventually fog up.
[/quote]

Being near the ocean, the Japanese probably do not realize some areas get the highly variable Afternoon to morning temperature changes.

Actually the climate in Japan varies hugely from Okinawa up to Hokkaido. And yes it does get cold at night and warm in the daytime, at least in the Osaka area.