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  #1  
Old 10-16-2011, 02:48 PM
b2500 b2500 is offline
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Default 1999 Mazda B2500 SE 2.5

Hello everybody, I bought this truck couple of days ago and Temperature gauge works funny - it wont go in the middle between C and H, it just stays around "C" at the bottom of the gauge.

Today I took out two sensors from thermostat housing, put them in hot water to test them, nothing happens, doesn't move at all. My guess is there is a third sensor somwhere or these sensor are dead?

Heating works. Top hose from radiator gets warm after 5min so there is circulation going on.

I am new to DIY stuff around cars, hopefully I learn quick

Here are some photos in attach.
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Old 10-16-2011, 02:55 PM
b2500 b2500 is offline
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Default Re: 1999 Mazda B2500 SE 2.5

Also I found this wire wondering around, anybody have idea what it could be?
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Old 10-16-2011, 03:03 PM
ObsoleteE ObsoleteE is offline
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Default Re: 1999 Mazda B2500 SE 2.5

First off, welcome! I've got a 99 B2500 as well. How hot was the water you put the sensors into? Normal operating temp is ~180 degrees, so I doubt hot tap water would do the trick. As for your second post, that appears to be a vacuum hose that the previous owner blocked off for some reason. There are reasons a vacuum hose could be blocked off. On my car, after installing an intake, its common practice to block off a vacuum hose to the VAD solenoid. Hopefully someone with more experience with the 2.5 can chime in, mine's been trouble free thus far so I don't know too much about it. Good luck.
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Old 10-16-2011, 06:09 PM
b2500 b2500 is offline
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Default Re: 1999 Mazda B2500 SE 2.5

Thanks!

Water was at least 180F as it was straight from microwave (3min in there, boiling) Even if it was less then 180 should move needle, nope, needle was still. But when I drive car or idle, it will move but only to C, rarely more than that. Strange.

I just bought this from a friend, I drove it in the summer too - gauge never went more than 1/4 from C mark.
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Old 10-16-2011, 07:41 PM
sheltonfilms sheltonfilms is offline
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Default Re: 1999 Mazda B2500 SE 2.5

That vacuum wire is suppose to go to your heater control valve. It is the valve on your two heater hose lines. When your A/C is OFF or on MAX A/C, vacuum is applied to the valve and coolant bypasses the heater core.

Since this isn't hooked up and/or the previous owner took out the valve coolant is always flowing to your heater core.

As for you temp gauge, I'm thinking the water pump is gone. The impellars are probably gone. The temp sensors are in the "heater core circuit" so if fluid is slowed down through the heater core then the coolant flowing over the temp sensor won't be fresh (shows low temp.) If your water pump is bad, it maybe able to keep the engine cool but not enough UMMMPH to push the coolant through the heater core circuit due to the small size of the coolant passages of the heater core.

Same thing on my 2.5 and it was the water pump.


BIG TEST:

See if you can get heat through your vents......how hot?
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Old 10-16-2011, 08:24 PM
b2500 b2500 is offline
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Default Re: 1999 Mazda B2500 SE 2.5

Vents blow hot, like they should. After starting engine, 5-10min later I can feel top big hose warm, 15min idiling its too hot ho hold. Bottom hose from radiator was cold.

Is it possible that water pump is gone at 90k miles? I think water circulation is fine from these tests.
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Old 10-18-2011, 04:24 PM
b2500 b2500 is offline
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Default Re: 1999 Mazda B2500 SE 2.5

Problem solved.

I have made a circuit with piece of wire on connector to figure out which one is sending signal to in dash gauge. When standing in the front of vehicle, the first sensor is called - temperature switch - this one sends signal to gauge. Other sensor is called - temperature sensor - and has nothing to do with gauge in dash.

So I have replaced temperature switch with new one ($11), and needle in dash goes to middle like it should, now I have temperature reading.
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Last edited by b2500; 10-18-2011 at 04:27 PM.
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Old 10-18-2011, 05:10 PM
sheltonfilms sheltonfilms is offline
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Default Re: 1999 Mazda B2500 SE 2.5

At least it was a cheap fix. BTW they are both sensors (variable resistance depending on temp). One is for the gauge one is for the PCM. If it was a switch it would just ground out at certain temp. Like the oil switch grounds out when oil pressure is above like 6-8 psi.
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Old 10-18-2011, 06:41 PM
b2500 b2500 is offline
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Default Re: 1999 Mazda B2500 SE 2.5

Yes, they are both sensors, but this is how they call them in store - so if someone is buying, they know what to look for.
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Old 12-25-2012, 09:58 AM
concrete.angel.4 concrete.angel.4 is offline
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Default Re: 1999 Mazda B2500 SE 2.5

I bought a 1999 Mazda B2500 I drove it for about a week and the gage stayed between C and H. Yesterday I was driving it and temp gage went all the way over to hot. So I pulled over and it didn't seem to be hot, I was able to pull the radiator cap. I drove the truck more and the gage kinda flickered and sometimes would go to hot then go back down. I took 10 miles down interstate to get it up to higher speeds and it never went over to hot. I let the truck for about an hour got in truck and temp gage said it was hot then when I started driving it the gage went down. I am not sure what is wrong with it. Any ideas?
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Old 01-02-2013, 04:04 PM
b2500 b2500 is offline
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Default Re: 1999 Mazda B2500 SE 2.5

I would replace sensor for gauge as I have, and then you will know what's happening.
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Old 01-03-2013, 06:44 PM
SavageSalad SavageSalad is offline
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Default Re: 1999 Mazda B2500 SE 2.5

I have the same problem as OP. So all I have to do is replace the sensor for the dash gauge and it will be fixed?
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