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97 Disco 1 Temp Problems?

Old 09-13-2018, 03:41 PM
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Default 97 Disco 1 Temp Problems?

Hi All,

I have a 97 Disco 1 that I started to work on and recently had some problems with temp. It would run hot and fluctuate in temp no matter where I drove. A neighbor who know his way around these trucks suggested to get the radiator fixed. So, I had the radiator rodded and fixed. Had the system backflushed, a new thermostat put in (After a recent conversation I was told it a 195F or 190F). I had it bled twice and replaced both the sensors (garage and CPU). According to the mechanic the fan clutch seems to be ok and he said the water pump must be ok since it not leaking as all (and no corrosion near it).

Since then I have bought a Ultra Gauge Blue and have been looking at temps. It seems to be 196 and 206 with most of the time being steady between 199-205F. I recently drove up to Arrowhead and the temps got up to 205 but stayed pretty much around 201 uphill. Now, here is something that I noticed driving downhill: When ever I was going downhill the temp would drop to about 185 (+/-3-5F) but the moment it was level or uphill it would be back at 199F under load.

At first I though it might have been the gauge in the dash or the resistor (a wonderful tip by rover parts mechanic) but before I undo the dash and check the resistor (a ton of work for a newbie), I thought I check the actual temps via the UltraGauge.

Does anyone have advice on where too look or how to check IF something is going on (other than running a little warm/hot) and how to check it? Thanks in advance.
Old 09-14-2018, 08:01 AM
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I run a 180 deg t-stat. (88 C / 190 F is stock)
https://www.amazon.com/Stant-45858-SuperStat-Thermostat-Fahrenheit/dp/B000C823VE?keywords=Stant+45858&qid=1536926160&sr=8-1-fkmrnull&ref=sr_1_fkmrnull_1 https://www.amazon.com/Stant-45858-SuperStat-Thermostat-Fahrenheit/dp/B000C823VE?keywords=Stant+45858&qid=1536926160&sr=8-1-fkmrnull&ref=sr_1_fkmrnull_1

I'd start there. Cheap and easy to replace. Test the new one in boiling water before install. When installing put the 'jiggle pin' at twelve o'clock and the spring side toward the block.

Fan clutches are tricky. They may look/feel OK but when push comes to shove, they don't operate as well as they should. They are cheap enough to replace.
https://www.amazon.com/dp/B000C3F31G/?coliid=I3F7AF1B4VV8ZK&colid=3SZYBJV1LFLYW&psc=0&ref_=lv_ov_lig_dp_it https://www.amazon.com/dp/B000C3F31G/?coliid=I3F7AF1B4VV8ZK&colid=3SZYBJV1LFLYW&psc=0&ref_=lv_ov_lig_dp_it

The radiator is often the culprit but you've checked that box. Bleeding these engines can also be tricky but I don't see that as your problem given your description.

Lastly, welcome to the forum. In the future post your question in the D1 section and you'll have more eyeballs on it and are more likely to get help.

Be sure to check out the "Discovery series 1 tech section" thread and help yourself to any/all manuals which can be found in the link in my sig.

Last edited by WaltNYC; 09-14-2018 at 08:22 AM.
Old 09-14-2018, 01:58 PM
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Thank you, WALT NYC, I appreciate it. Thanks for the insight and I'll get started there. And thanks for the resources, I got some reading' to do.
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