‘91 7.3L overheating?
Trailering
Joined: Nov 2005
Posts: 24
Likes: 3
From: Ca, USA
No, aftermarket. Every one of these I've seen that isn't Motorcraft is broken like this. I'm normally not part of the "oem only" crowd, but in this instance it does have to be.
Lead Driver
Joined: Apr 2002
Posts: 5,364
Likes: 1,258
I am an OEM guy. I try to get motorcraft replacements if available. I have had to replace a motorcraft thermostat after 1 year it failed open. But I was able to get refunded as they have a 2 year warranty. The replacement has been working now for at least a year, maybe two, I'd have to check my log. So even motorcraft is not bomb proof. I do recommend motorcraft wiper replacements. They are the longest lasting great performing wipers I've seen. Lasting around a decade or more.
Lead Driver
Joined: Apr 2002
Posts: 5,364
Likes: 1,258
Just checked my log book. Second motorcraft thermostat was installed 2-1/2 years ago and a little over 10,000 miles. So if it goes TU I'm on my own this time. By the way, regardless of which brand you go with test the opening temperature in a pot of water on the stove. Make sure it meets spec before installing. 190 degrees if I remember correctly.
Tuned
Joined: Sep 2024
Posts: 490
Likes: 122
From: Ougadougou
Just checked my log book. Second motorcraft thermostat was installed 2-1/2 years ago and a little over 10,000 miles. So if it goes TU I'm on my own this time. By the way, regardless of which brand you go with test the opening temperature in a pot of water on the stove. Make sure it meets spec before installing. 190 degrees if I remember correctly.
Lead Driver
Joined: Apr 2002
Posts: 5,364
Likes: 1,258
My original 6.9 lasted for 300K miles with the original tstat. But the rings were worn and the head gasket blew. I dropped in a new 6.9 and that tstat lasted over 100K miles before failing open. I'd say the older your motorcraft tstat the better the quality.
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Superdave71
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