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Heater Not Working? M35

Sage222

By Sage222,
in Four Door Family & Wagoneers

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Sage222 Rising Star

Sage222

Posted
Posted

Just did a search and didnt find anyone with the same problem. (I hope that's not the case!).

Yesterday found my heater doesnt appear to work.. Fans come on though no heat... (going to try air con this afternoon).

Anyone seen this before?

I hope its something simple... (though it rarely is!).

Cheers.

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scotty nm35 Grand Master

scotty nm35

Posted
Posted

What temp did you have it set to? 18 degrees won't work, it just blows outside air.

If the heater stops working you most probably have low coolant. It only takes a few cups to be missing for it to stop flowing through the heater circuit. Wait for it to cool down completely before checking it, then go through the Voodoo bleeding procedure, again and again.

Dunc Mentor

Dunc

Posted
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Mine's the opposite!

If its set to 18deg on aircon it blows cold, but on anything else, it blows hot (even set to 18.5deg)!

Ditto on mine, only since my accident though. Im surprised the boss hasn't made you fix it yet :P

zei20l Grand Master

zei20l

Posted
Posted

could be a few things. there is a motor that drives the temperature control, which opens/closes a valve to the heater core. and also down under the steering wheel, to the left, on the removeable panel is a small vent with a pipe from the AC. check to make sure thats operational. i believe there is a sensor in there.

also make sure the dash sensor for sunlight is plugged in and/or operational

i have spares of them all, if required

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Dunc Mentor

Dunc

Posted
Posted

could be a few things. there is a motor that drives the temperature control, which opens/closes a valve to the heater core. and also down under the steering wheel, to the left, on the removeable panel is a small vent with a pipe from the AC. check to make sure thats operational. i believe there is a sensor in there.

I know the one you're talking about, I'll have to check that out, I had that panel off to disconnect the VSS switch for my roadworthy inspection (Being able to alter your exhaust flow whilst driving is illegal *ugh*) so I may have missed that one

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Edit: Took too long to type. lol. You guys beat me to it.

You need to find the in cabin temp sensor, I think it might be under the steering wheel where you can see a little vent in the lower cover. It has a rubber tube attached to it. If this is the sensor, perhaps it is dirty or the hose has come off?

It will blow hot air until the temp has been reached under the dash, this may take a while with the vents blowing air on your face. Or the sensor is shagged?

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Sage222 Rising Star

Sage222

Posted
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Posted (edited)

damn... just had a look at everything.. got coolant spray on both sides of the radiator.. looks like im up for a new radiator... :(

Anyone got a part number/price?

Scotty i take it your wreck has one still? :)

Is this a common thing to fail? if so should prob get a new one..

Edited by Sage222
PN-Mad Grand Master

PN-Mad

Posted
Posted

The top tanks are usually the first thing to go. Hot coolant and being made of plastic makes the brittle, and they crack. Either that or the seal around the top tank.

Bottom tank is usually ok, becuase its cool by the time it gets down there.

Rad shops can replace top tanks, but easier option is the wrecker one I guess.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

A new replacement one isn't cheap, around $350 - $400.

I have a second hand one in the wreck for sale, and I may also get rid of my new stock one as it is too thin for the track. It's only a few months old... Let me know.

Daleo Grand Master

Daleo

Posted
Posted

the good thing is, a leaky radiator will last for at least 3 months.

mine leaked for ages. it was only seeping

Probably not something you want to risk with summer just around the corner.

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