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Heater Not Working

Messiah

By Messiah,
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Messiah Mentor

Messiah

Posted
Posted

Lo all,

Since i bought it the heater in my 33gtst has never worked, aircons fine... heater flows air... but its stone cold.

My understanding is that there is a core connected to the engine colling system that sits deep inside the dash that is used to heat the air.

I'm going to go on the assumption that the problem lies here, bit it blocked off, bypassed or missing entirely (might have leaked for the prev owner).

I thought a good approach would be to disconnect the pipe work to in inside the engine bay and run water through to it to see if it came out again.

It strikes me that i might get caught out here if the core is bypassed inside the cabin, dont know how to check that, but i imagine i might get some idea if it is by how long it takes for the water to come out the other end.

And i'll probably do a coolant flush as seeing as i've disconnected stuff.

If this test fails guess i'll have to pull the dash and go looking at the core (i want to avoid this if possible).

if it works... well i'm going to have to look back towards the block and try to figure it out.

Anyone care to offer some feedback or suggestions regarding this. TBH i'm not sure what pipes i need to disconnect in the engine bay to get started so i'm going to start looking that up.

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wolverine Grand Master

wolverine

Posted
Posted

I'll make a bet it has been by-passed in the engine bay and you should be able to see this by looking on the firewall on the passenger side.

The inlet and outlet hoses for the heater core will be joined there.

Getting the heater core out is a bit of a chore.

Messiah Mentor

Messiah

Posted
  • Author
Posted

heh i just remembered i have the 33 manual... time to go looking in there for where the pipes should be.

Thanks for the imput Wolverine, it will be the first thing i look for.

If it has been bypassed... i guess that will mean i should pull it out and see why....

damn

tiberis Enthusiast

tiberis

Posted
Posted

Alternatively, the valve controlling the flow of water through the core could be stuck/ disabled/ broken.

I would have assumed it was like the CA engine and always had hot water flowing through it, but on my R33 at the back of the engine i noticed a flow valve on one of the pipes with a control wire passing through the firewall.

If this is the item at fault, i imagine there would be more effort to find out how/ why it's not working.

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