B3000 heating & cooling system

Tiny
JHAGEN2
  • MEMBER
  • 2012 MAZDA TRUCK
I have a 1995 Mazda B3000 with 2001000 miles. The truck has been great over the years, One problem, I seem to have an internal coolant leak. Just to give you a somewhate quick synopsis, barely provides any heated air to the passenger compartment unless traveling at 60-70 mph, then it is barely warm & also the temp gage is on the cooler side. If stuck in traffic or a line, the temp gage will creep up to the "H" telling me it is overheating, If I rev the engine to a high idle it will go back down. Checked the oil, looks fine & has been fine over the course of this issue. I have bled the cooling system a number of times so I do not think this is the issue. In the last week or so & today, I stopped at a gas station to fill up, (just took a few minutes) when I started the truck it smoked like nobodies business, I pulled around back of the station, the exhaust feels extremely moist. No smell of antifreeze in the passenger compartment. I pulled all of the plugs to see if any of them would give me an indication of what cylinder has coolant leaking in, but no luck. Is it possible for just the intake manifold to have a leak & cause this problem with the oil looking fine? Oil being ok tells me the head gaskets are ok & a possible intake leak, please advise on what I should do before I get stranded please.
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Tuesday, January 2nd, 2007 AT 8:47 PM

3 Replies

Tiny
SERVICE WRITER
  • EXPERT
Now that's a lot of miles!

What size motor?

Is the cooling fan coming on?

Are you having to add coolant?
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Tuesday, January 2nd, 2007 AT 8:50 PM
Tiny
COSMO
  • MEMBER
Sounds like you might have a cooling fan clutch/ radiator problem combination on the overheating side of thinds, plus maybe a t-stat issue.

The smoking thing is an issue and I'm pretty sure if the intake were leaking you would of found coolant in the oil by now. Chance are you have run 'hot' to many times and may have done some head gasket damage. I would have your system checked both hot and cold by a trained technician.

Cosmo. Mazda Tech
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Tuesday, January 2nd, 2007 AT 9:33 PM
Tiny
JHAGEN2
  • MEMBER
It's a B3000, 3 liter. The fan clutch is fine, I have changed the waterpump & changed the thermostat 3 times. Is it possible, (I haven't been able to locate a diagram) for coolant to be leaking from one of the intake manifold ports down into one of the cylinder intake port? This thing has just had me puzzled for quite some time & I think it's getting worse. I don't want to give up on my truck, she's gave me a lot of good miles. I do all of my own work (so far) clutch job, trouble codes, heater core etc. I hate taking it to some yahoo I don't know, you hear horror stories everyday, I'll check around. When you say "checked" are you meaning a leak down check or compression check? Also is there dye that can be put in the radiator to detect where the leak is coming from? I mean dye that I can do myself. Thanks for your help.

Jerry
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Wednesday, January 3rd, 2007 AT 6:44 AM

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