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1990 Mazda B2600 Overheating

Tiny
95BEAR
  • MEMBER
  • 1990 MAZDA B2600
  • 2.8L
  • 4 CYL
  • 4WD
  • MANUAL
  • 180,000 MILES
The truck will run at about half temp when going. Takes about 2 miles to get that hot. If I turn it off then back on it will read about 3/4 if not a bit more. Replaced the fan clutch, thermostat, changed oil and radiator flushed. What can it be?
Monday, September 22nd, 2014 AT 11:57 AM

9 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Do you have coolant loses?
Is the gauge accurate?
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Monday, September 22nd, 2014 AT 1:12 PM
Tiny
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  • 11 POSTS
Gauge is right. Nothing is showing on the ground when it comes to coolant.
I should note that there is a small exhaust leak. Coming from the manifold into the piping its missing a donut.
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-1
Monday, September 22nd, 2014 AT 8:51 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Did you check the coolant level when engine is cold and what does it show?
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Tuesday, September 23rd, 2014 AT 8:56 AM
Tiny
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  • 11 POSTS
Both the reservoir and radiator are filled. Checked with 3 different mechanics on that. And the fan, thermostat and radiator had to be done anyway.
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Tuesday, September 23rd, 2014 AT 10:49 AM
Tiny
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  • MECHANIC
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At temperature reading of 3/4, is the coolant showing signs of overheating?
Does the reading changes when the engine is started and running?
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Sunday, September 28th, 2014 AT 2:26 AM
Tiny
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  • MEMBER
  • 11 POSTS
The temp does change. I can start it and run it a few miles and it will hit 1/2. Before this problem it ran under half at about 1/3. Then after I let it sit for an easy 30min and start the truck up the temp will read 2/3 to 3/4.

The coolant does show signs of heating up. Sometimes it will push out of the radiator into the reservoir while boiling. Only ever back flushes maybe 1 of 8 times.
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Sunday, September 28th, 2014 AT 8:05 AM
Tiny
KHLOW2008
  • MECHANIC
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How is the condition of the radiator cap? If it is not new, try replacing it.
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Tuesday, September 30th, 2014 AT 9:48 AM
Tiny
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The cap is new and there is no leak under it where it would commonly crack and leak.
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Saturday, October 4th, 2014 AT 7:47 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The only thing left to check would be the water pump. It could be weak due to worn impeller.
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Monday, October 6th, 2014 AT 8:57 AM

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