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Heater not working

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Heater not working

Postby dandaman187 » Sat Jan 21, 2012 10:19 am

Gday my heater will not work all the fans speed works and aircon works although does not get as cold as my other mu , and i was just wondering if by blocking the egr would that effect the heater,
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Re: Heater not working

Postby geeves » Sat Jan 21, 2012 2:22 pm

I thought heaters were never used there. Dont NZ ers still go to the beach on your coldest days.
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Heater not working

Postby mattmannz » Sat Jan 21, 2012 2:23 pm

First thing to check is the water level. if it's low your heater wont get hot.

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Re: Heater not working

Postby dandaman187 » Tue Jan 24, 2012 2:49 pm

mate it still cools down over here especially when your warm blooded lol yeah it does have a water leak at the front of the engine i think it is the water pump down the bottom so i will have to get that fixed but the water level is ok , im just finding that these cars are great but you need time and equipment to really get value out of them i have every part i need but no time or the tools to fix im almost to the point where i will give somebody one of my mu's to do all that i want done to mine like changing parts from one to the other and the biggest job is transfer my manual box over to to replace the auto the auto is awesome but i have no faith in it and it is way heavier on fuel i get 900klm a tank out of my manual and only 650 out of the auto i have sold one spare engine and have another 80% of another auto box and lots more parts that i would trade for someone to help me get one good mu out of the 2 i have and spares i have , anytakers or im a chef and would gladly trade barter i could cater somjeones next party or something, the missus wont let me spend another cent on the cars lol
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Re: Heater not working

Postby pig75 » Tue Jan 24, 2012 4:37 pm

Could be a bad thermostat or the heater core full of mud or just the hoses hooked up incorrectly
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Re: Heater not working

Postby dandaman187 » Tue Jan 24, 2012 10:23 pm

thanks pig but with what you have suggested wouldnt that have serious affect on the engine like overheating , cause it seems that the temperature gauge never gets higher than a little bit more than quarter up , my other one sits dead on half by the way i think it was a video of u on you tube i saw climbing through a massive rock cliff that was awesome but the mu didnt sound healthy afterwards
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Re: Heater not working

Postby pig75 » Wed Jan 25, 2012 5:39 am

Sounds like a bad thermostat i would say it's stuck open or has been removed
That would be me the MU is fine the only damage was a few more dents and a busted CV shaft
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Re: Heater not working

Postby dandaman187 » Wed Jan 25, 2012 2:28 pm

yeah nice ill replace it today and see what happens by the way im not sure if it is common knowledge but i found a website that walks u through diagnostics with how to do it without the right scanner , (using a paperclip) and what the codes are the website is www.rennacs.com helped me all i had to do was adjust tps and reset the computer
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Re: Heater not working

Postby geeves » Wed Jan 25, 2012 6:27 pm

that rennacs site set off the alarm bells in my anti virus. Use with caution if you dare
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Heater not working

Postby dandaman187 » Fri Jan 27, 2012 9:11 pm

gday mate , yeah i used it and it worked really well that well infact that after i reset the computer in the car it came up with no faults and all flashing lights went away but now coolant comming from it looks like the bottom of the head just above the water pump/crank cover , not good and very dis heartning !! ill take a picture and put it on here but im almost sure it is an expensive fix
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Re: Heater not working

Postby geeves » Sat Jan 28, 2012 5:47 am

There are 2 hoses there that are more likly. One is the bypass and almost invisible the other goes to the turbo. Both are knuckle crushers to change but far better that a head gasket. Could also be the thermostat gasket or the gasket between the thermostat housing and head
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Heater not working

Postby turnturn » Sat Jan 28, 2012 4:35 pm

Does it look the same as this?
viewtopic.php?f=23&t=1668&hilit=+water+leak
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Re: Heater not working

Postby dandaman187 » Sat Jan 28, 2012 8:59 pm

damn yes exactly but beautiful green lol i read all that was said about it and yeah i new it was going to be expensive, so it is not the head gasket ? and have u fixed it yet ? and mine is a 4jb1 is it any different ?
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Re: Heater not working

Postby turnturn » Sun Jan 29, 2012 8:25 am

Yes, I have fixed this problem. As mentioned in the other post I opted for removing my engine to fix. There are a few posts around this site regarding methods of engine removal. I choose the "remove the gearbox first" way.

I also opted to replace my front and rear crank seals, water pump, timing belt, tensioner, idler bearing and all engine hoses while everything was apart.

Most parts are the same between the 4JB1 and 4JG2 but I found it paid to have it apart before ordering any parts.
There are two types of timing belt, squareish (trapezoidal?) and roundish tooth.
There are two types of rubber seal around the sump to crankshaft area. Most of the seal between the alloy sump and the block is done with a sealant. I used a product called Three-Bond.
There is also two types of gasket to replace the one that is currently leaking. A paper type gasket and a sheet metal one (combined with sealant). I went with the sheetmetal one.

All good so far, but I've only done about 5000ks in this since fixing.

Unfortunately my 92 4JB1 is showing signs of the same problem :-(
This will probably become my winter project. Cant complain too much though as this vehicle has done 330,000ks without any major work :-)
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Re: Heater not working

Postby Jayco » Sat May 12, 2012 2:34 pm

Yer my heater dosnt work either ive tested the thermostat and blow all of the pipes through, the fan and every thing else works except the heater if any has any ideas please tell me this is driving me crazy. :evil:
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Re: Heater not working

Postby Sandpitmatt1 » Sun Sep 20, 2020 7:16 am

Did anyone figure out the heater issue? My fan works (although only on Hi) both pipes in the engine bay going to the core seem to be hot. My Bighorn runs at about 1/4 on the temp gauge. I’ll start with flushing the heater core and see if that makes a difference. Does anyone know what the two cables on a spring loaded rocker by the A/C are for? One has a red sleeve on it. I though maybe it was to do with the heating but it doesn’t seem to do anything
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Re: Heater not working

Postby 4wdWiz » Sat Oct 24, 2020 2:43 pm

Some of my heater battles...
Air lock in cooling system after replacing a split radiator -this caused engine overheating and the heater would blow cold when overheating.
The heater temperature setting adjusts a damper in the air flow, this seems is a bit sticky so when I'm getting no heat i put it fully on then back it to the temperature I want.
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Re: Heater not working

Postby geeves » Sat Oct 24, 2020 4:53 pm

Air lock suggests the hoses might be the wrong way round
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: Heater not working

Postby burekvid » Fri Mar 25, 2022 10:42 pm

The most common reasons an Isuzu Pickup heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
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