1990 Singlecab II

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DoubleOSeven
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1990 Singlecab II

Post by DoubleOSeven »

Thermostat Housing.

Black sensor sends signal to binnacle for temperature gauge, this works fine.

Blue (Temp2) sensor sends signal to ECU, I think, but as it’s not fuel injected it doesn’t have an ECU. I’m not convinced this is my issue or not, regarding radiator fan not working.

Image


Page 12.41 Haynes.

S42 50A fuse in the engine bay black junction box - my next port of call … but alas no fuse in there, no idea where this is then?

Image

I'm wondering if page 12.41 is an 'early' van wiring diagram.
Last edited by DoubleOSeven on 07 Sep 2021, 17:42, edited 2 times in total.
1990 Golf 1.6 Auto
1990 Transporter 2.1 Manual

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DoubleOSeven
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1990 Singlecab II

Post by DoubleOSeven »

Accelerator diaphragm was sending over 6.75ml on a 5 cycle press, fixed. Only thing I swapped during rebuild, so that’s the running issue sorted.

I have come to the conclusion that the radiator fan thermo sensor is kaput. Get that done and I should be in business, hope.
1990 Golf 1.6 Auto
1990 Transporter 2.1 Manual

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DoubleOSeven
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1990 Singlecab II

Post by DoubleOSeven »

HELP.

Well, I guess I should be grateful I can push it back in the garage and forget about it for a bit, when it doesn't behave! No rush; but I do want to get it working well - so I'm asking for help now folks.

Overheating : I changed the 3 pin radiator sensor today, again! but the 2 stage fan just refuses to work. Temperature needle way past 12 o'clock. I have short circuited the 3 pin feed and the fan works, both speeds. Had a think. I was expecting the radiator to be red hot, but I can put my hand on it? A clue, perhaps? Blocked maybe - have you had any experience of this? Air lock maybe - my last thought.

Also, when it gets hots it stalls, a lot - I managed to get around the block, maybe 2000 yards, but on the way back it stalled. I don't know if this is related to the over heating, the exhaust is STILL popping once engine has heated up, but sweet as a nut when on choke (warming up).

I’m putting the poor running when hot down to the blocked radiator / air intake poor when hot.

An ideas, welcome ... I won't shoot them down.
Last edited by DoubleOSeven on 13 Sep 2021, 12:14, edited 2 times in total.
1990 Golf 1.6 Auto
1990 Transporter 2.1 Manual

RogerT
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Re: 1990 Singlecab II

Post by RogerT »

DoubleOSeven wrote: 07 Sep 2021, 17:42
S42 50A fuse in the engine bay black junction box - my next port of call … but alas no fuse in there, no idea where this is then?


Mine is on the A pillar next to or above the earth crowns, I think?
'88 Transporter with hitop camper conversion, 1.6td.

RogerT
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Re: 1990 Singlecab II

Post by RogerT »

Ah, you’re past that stage if it works by bridging the contacts, I think.
'88 Transporter with hitop camper conversion, 1.6td.

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DoubleOSeven
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Re: 1990 Singlecab II

Post by DoubleOSeven »

I'll try these, in order:

Air lock (bleed the system)
Thermostat not opening (remove thermostat & test in some boiling water)
Water pump seized (open expansion cap when it's hot [DANGER] if water spits out - its working, if it doesn't - it ain't)
1990 Golf 1.6 Auto
1990 Transporter 2.1 Manual

300CE
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Re: 1990 Singlecab II

Post by 300CE »

Is it the original radiator Martin?  If so, it could be proper rusted especially if it's been sitting around for a while - when i changed mine you could feel the difference in weight against the new one the rust was that bad.  That said it still held temperature and seemed ok even in that condition.

Worth doing the checks you've suggested - i had also changed the sensor when changing the rad and the temp now settles at almost 3/4 rather than 12 o clock with the old one.

 
'86 DG, Weber Carb

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DoubleOSeven
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1990 Singlecab II

Post by DoubleOSeven »

I think you are right. Radiator.

I changed the thermostat, the water pipes going back to the front are warm but radiator stone cold.

I guess in hindsight, I should have flushed the radiator during the build, or better still removed it completely. Lesson learnt. Hope that’s it.

Pulled the grille off and the drivers headlight lens fell out and smashed on the floor. Patience tested! ;)
1990 Golf 1.6 Auto
1990 Transporter 2.1 Manual

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DoubleOSeven
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Re: 1990 Singlecab II

Post by DoubleOSeven »

Ash1293 has sent me a headlamp lens in record time.

It helps improves my mood

Thanks to James & those feedback messages from all.
1990 Golf 1.6 Auto
1990 Transporter 2.1 Manual

300CE
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Re: 1990 Singlecab II

Post by 300CE »

If you're getting a new one Mart, I think Brickwerks do one which has a slightly larger core as well.
'86 DG, Weber Carb

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