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?
Do you
have the same problem?
Yes
No
Monday, September 22nd, 2014 AT 11:57 AM

9 Replies

Tiny
KHLOW2008
  • EXPERT
Do you have coolant loses?
Is the gauge accurate?
Was this
answer
helpful?
Yes
No
Monday, September 22nd, 2014 AT 1:12 PM
Tiny
95BEAR
  • MEMBER
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.
Was this
answer
helpful?
Yes
No
Monday, September 22nd, 2014 AT 8:51 PM
Tiny
KHLOW2008
  • EXPERT
Did you check the coolant level when engine is cold and what does it show?
Was this
answer
helpful?
Yes
No
Tuesday, September 23rd, 2014 AT 8:56 AM
Tiny
95BEAR
  • MEMBER
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.
Was this
answer
helpful?
Yes
No
Tuesday, September 23rd, 2014 AT 10:49 AM
Tiny
KHLOW2008
  • EXPERT
At temperature reading of 3/4, is the coolant showing signs of overheating?
Does the reading changes when the engine is started and running?
Was this
answer
helpful?
Yes
No
Sunday, September 28th, 2014 AT 2:26 AM
Tiny
95BEAR
  • MEMBER
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.
Was this
answer
helpful?
Yes
No
Sunday, September 28th, 2014 AT 8:05 AM
Tiny
KHLOW2008
  • EXPERT
How is the condition of the radiator cap? If it is not new, try replacing it.
Was this
answer
helpful?
Yes
No
Tuesday, September 30th, 2014 AT 9:48 AM
Tiny
95BEAR
  • MEMBER
The cap is new and there is no leak under it where it would commonly crack and leak.
Was this
answer
helpful?
Yes
No
Saturday, October 4th, 2014 AT 7:47 PM
Tiny
KHLOW2008
  • EXPERT
The only thing left to check would be the water pump. It could be weak due to worn impeller.
Was this
answer
helpful?
Yes
No
Monday, October 6th, 2014 AT 8:57 AM

Please login or register to post a reply.

Recommended Guides