Heater Issues

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TeH_Jamie
Posts: 24
Joined: 06 Sep 2013 06:10 pm

Heater Issues

Post by TeH_Jamie » 13 Sep 2013 05:57 pm

Hi there,

I was having issues with my heater as it was always blowing cold even on the hot setting, and the car didn't seem to run up to temperature properly. I thought maybe this was a thermostat issue. Anyway I felt under the footwell with the heaters on hot, and I could actually feel some heat! Just not through the face facing ones. After 10 seconds of directing the heat through the footwell, the heaters decided to pack up altogether and doesn't blow anything.

Any suggestions please?

Thanks,
Jamie

classicswede
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Re: Heater Issues

Post by classicswede » 13 Sep 2013 10:33 pm

The 2 centre vents only have a cold air feed.

If the other vents are not getting hot sounds like you have a stuck/broken heater valve. I have replacments for later cars in stock but not early ones.

Has the heater fan now stopped working? If so then that is a separate issue
Dai

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TeH_Jamie
Posts: 24
Joined: 06 Sep 2013 06:10 pm

Re: Heater Issues

Post by TeH_Jamie » 13 Sep 2013 11:00 pm

I see. It definitely felt like I was getting some heat from under the footwell - that's what made me crank it up to number 4 and that's what made the fan suddenly stop working and not blow at all - as if something blew. Going on that the heater valve should be ok? Wondering if it's the resistor pack.

macplaxton
Posts: 3283
Joined: 09 Feb 2008 02:29 am

Re: Heater Issues

Post by macplaxton » 13 Sep 2013 11:23 pm

TeH_Jamie wrote:crank it up to number 4
Er, is this a Spinal Tap heater edition? :lol:
72 DAF 44 Estate 78 Volvo 343DL Black BeautyImageImage
82 Volvo 343DL CVTImageImage 88 Volvo 340DL Diesel

Ride_on
Posts: 2262
Joined: 26 May 2009 05:34 pm
Location: Belfast, N. Ireland

Re: Heater Issues

Post by Ride_on » 14 Sep 2013 02:31 pm

Yes most likely the resistor pack thermal cutout inside the air box near the fan. Mac is showing a refurb/rebuild method on these in another thread, but a common bodge is to short it out. The bodge comes with an increased theoretical fire risk.

McP means its only goes up to 3 ;-) using it on full power should not be a problem, but the thermal cutout tends to warp and corrode.
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

TeH_Jamie
Posts: 24
Joined: 06 Sep 2013 06:10 pm

Re: Heater Issues

Post by TeH_Jamie » 14 Sep 2013 04:56 pm

Bit of an update:

I bashed the black heater box underneath the bonnet and the fan came back on when I turned the switch on. I put some spray grease on the fan and ran it for some more and it cut out again - sounds to me like the motor is overheating?

Ride_on
Posts: 2262
Joined: 26 May 2009 05:34 pm
Location: Belfast, N. Ireland

Re: Heater Issues

Post by Ride_on » 15 Sep 2013 05:20 pm

The thermal cut out is in the resistor pack, its a common fault. The motors are fairly reliable.

To test try just connecting 12V to the motor directly, or feel the back of the motor to see if it getting unusually hot.
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

TeH_Jamie
Posts: 24
Joined: 06 Sep 2013 06:10 pm

Re: Heater Issues

Post by TeH_Jamie » 15 Sep 2013 08:36 pm

Ride_on wrote:The thermal cut out is in the resistor pack, its a common fault. The motors are fairly reliable.

To test try just connecting 12V to the motor directly, or feel the back of the motor to see if it getting unusually hot.
I just found it a bit weird that it kicked back in again once I gave the black heater box under the bonnet.

I'll test the motor to see if any unusual heat is coming from it.

Assuming that's ok, what are the chances of me finding a replacement resistor pack around?

macplaxton
Posts: 3283
Joined: 09 Feb 2008 02:29 am

Re: Heater Issues

Post by macplaxton » 15 Sep 2013 08:47 pm

TeH_Jamie wrote:I just found it a bit weird that it kicked back in again once I gave the black heater box under the bonnet.
It's a bit weird, but it's also where the resistor pack lives.

Read this thread http://www.volvo300mania.com/forum-uk/v ... =5&t=14906 and maybe ask "mac" if he needs any more testers?
72 DAF 44 Estate 78 Volvo 343DL Black BeautyImageImage
82 Volvo 343DL CVTImageImage 88 Volvo 340DL Diesel

TeH_Jamie
Posts: 24
Joined: 06 Sep 2013 06:10 pm

Re: Heater Issues

Post by TeH_Jamie » 16 Sep 2013 10:17 am

Good idea.

Will a resistor pack for a 1.4 1986 340 fit a 1.7 1987 340?

Ride_on
Posts: 2262
Joined: 26 May 2009 05:34 pm
Location: Belfast, N. Ireland

Re: Heater Issues

Post by Ride_on » 17 Sep 2013 11:03 pm

Probably, there are some different between older cars I think. around 86 should be fine.
1980 345 DL_______1987 360 GLE (project car restored to GLT spec and B230FT'd)
1984 360 GLT______1987 360 GLT
1983 360 GLS______1989 360 GLE
1985 340 GL_______1986 340 1.4
1985 360 GLS______1995 940 SE 2.3 Turbo Estate (daily)
1987 340 GL 1.7

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