No heater blower...very cold

West Slope Rover · Jan 15, 2012

Went out this morning to start up Stinky and found a coolant level sensor warning light and found that I did indeed have plenty coolant in the expansion tank. Knackered sensor or float thingy....

Anyway, as the engine was running I wanted to give the car a warm up and turned on the heater. Nothing happened, no blowing. Checked fuse which is good. Now, here I would check my legally purchased version of RAVE from Atlantic British to help diagnose the problem and tell me where heater relay is to be found, but my computer says that there is no protected disc in the drive, so I can't. When I pulled the fuse and turned on the swithch there was no voltage on my meter when bridging the fuse connectors.

Could somebody tell me where I can find that relay in a '93 4.2 LSE?

mikieman · Jan 16, 2012

im kinda sure the heater asembly and relays are the same thru 93...hope this helps...

West Slope Rover · Jan 16, 2012

Cheers mate! I've been mucking about on line for clues as to its whereabouts and actually pulled off the panel that covers the relay. Also looking at the switch, but at least I can swap out the relay and give it a test.

Datatek · Jan 16, 2012

If it's very cold and there is a little water in the heater plenum, it may have frozen the fan.

West Slope Rover · Jan 16, 2012

Datatek said:
If it's very cold and there is a little water in the heater plenum, it may have frozen the fan.

Thanks for the suggestion. Wouldn't voltage be apparent at the fuse connections if that was the case?

West Slope Rover · Jan 16, 2012

Well, I've swapped the relay with another and no joy.

JohnP38 · Jan 16, 2012

West Slope Rover said:
Thanks for the suggestion. Wouldn't voltage be apparent at the fuse connections if that was the case?

Try measuring from the fuse holder connection to ground and not across the the fuse terminals.A voltmeter is across and not in series.( as am ammeter is ).

West Slope Rover · Jan 16, 2012

Thanks for the info, John.

classic kev · Jan 16, 2012

Looking at the 1991 wiring diagram, the air con fan motors (the ones inside under the passenger side dash) are switched by the same relay. Try putting on the air con and then moving the fan switch. If the fans don't come on then you know for sure the relay isn't working.

Next I would check the earthing on the fan, then check the air con load relay, if this is stuck, then power won't get to the fan speed switch.

Good luck.

West Slope Rover · Jan 16, 2012

classic kev said:
Looking at the 1991 wiring diagram, the air con fan motors (the ones inside under the passenger side dash) are switched by the same relay. Try putting on the air con and then moving the fan switch. If the fans don't come on then you know for sure the relay isn't working.

Next I would check the earthing on the fan, then check the air con load relay, if this is stuck, then power won't get to the fan speed switch.

Good luck.

I 've tried the air con and that blower won't come on either. I forgot to mention that, my bad. That's why I thought that it may be the relay. I replaced the relay with another of the same and it still doesn't work. I'm about to go check voltage like someone who knows what they are doing (Thanks to John!) and will go from there.

West Slope Rover · Jan 16, 2012

No voltage shown. As I was doing the test I noticed that my phone charger in the cig lighter wasn't getting power. The car was running and I checked the rear sear lighter and there was no power there, either. Could this be related?

classic kev · Jan 16, 2012

West Slope Rover said:
No voltage shown. As I was doing the test I noticed that my phone charger in the cig lighter wasn't getting power. The car was running and I checked the rear sear lighter and there was no power there, either. Could this be related?

Can't say for sure but I think you'll find they are on different fuses. Unfortunately I don't have a '93 wiring diagram and I have a vague recollection that the cigar lighter supply is fused from a satellite fuse box under one of the seats. Sounds like you might have to get busy with the multi meter.

West Slope Rover · Jan 16, 2012

classic kev said:
Can't say for sure but I think you'll find they are on different fuses. Unfortunately I don't have a '93 wiring diagram and I have a vague recollection that the cigar lighter supply is fused from a satellite fuse box under one of the seats. Sounds like you might have to get busy with the multi meter.

Ah, it would be far more enjoyable if it were not snowing or I had a garage. Thanks for the input.

classic kev · Jan 16, 2012

West Slope Rover said:
Ah, it would be far more enjoyable if it were not snowing or I had a garage. Thanks for the input.

Know what you mean, my Rangie is off the road and my project LSE is in need of some serious work - mechanical, electrical and body!! Too cold to be outside skinning me knuckles today (apart from that I have work to do!).

West Slope Rover · Jan 16, 2012

So I went outside and turned it on and it's working.

but:clap2:

classic kev · Jan 16, 2012

West Slope Rover said:
So I went outside and turned it on and it's working. but:clap2:

That's good.... and bad. Good it's working, bad you don't know why it stopped in the first place. Maybe you need to check/clean all the earth points you can find - could easily be an earth fault.

West Slope Rover · Jan 16, 2012

classic kev said:
That's good.... and bad. Good it's working, bad you don't know why it stopped in the first place. Maybe you need to check/clean all the earth points you can find - could easily be an earth fault.

I agree and now I need to buy some little lights for my heater control panel because I broke the backs off 'em putting the panel back on. My councilor in high school said that I could do anything I put my mind too but my manual dexterity was atrocious and not to try to make a living with my hands. Which I do. Clumsily.

West Slope Rover · Jan 16, 2012

The weird thing is now the cig lighter is working and the original coolant level warning light is now quiet. I've had a problem with the sensor in the cap when one of the wires broke. That set the light flashing so I fixed the connection. This time I was confuddled because the connection was still good but the light was flashing none the less. Gremlins I think. Or perhaps a local witch...

MikeV8SE · Jan 16, 2012

Aaah, the joys of Range Rover ownership.

mikieman · Jan 16, 2012

id check the resistors ......but why not check the fan motor...but if you switch it to air..and the other fans dont come on mayby the switch is bad... the fan plug is behind the condenser ..but i know it sucks when its cold...and the heater dont work...had that when i first got mine...when you switch it to air ...does the compressor kick on???
but if it was me...and im kinda nuts...and i could feel the heat ...but no fan....id hot wire the blower motor....to get me through the winter....good luck ...

No heater blower...very cold

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