Engine never gets past 130 in summer or winter. I replaced the thermostat, the temp sending units, and had the ECU replaced, but it still stays at 130. The fans still run normal. My heat was working for the past few weeks, but it stopped working. I replaced the thermostat again with a 195 , that fixed the problem and i got heat for a few days then it cut out again. Need some help

 

this sounds strange, but try turning your temp to cool instead of heat. I did that the other day, and the temp guage went from rock bottom to medium

 

I actually tried that the other day, no difference. Temp stayed the same no matter how long i drove the car. Not worried about the heat so much, just wanted to know if it was bad for the motor to stay that cold.

 

what happens when the car idles for a long time after it's been driven for a bit?

 

Nothing it runs fine, smooth idle. The temp might go up about 5, but still no heat.

 

fab info..have been looking forward it

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Link Building

 

disconnect the wire on the fans. run the car and see if it heats up (with a/c off and heater off), if it does get hot like normal than maybe research more into thermostatic fan switch i would think, anybody agree? When done with the test dont forget to reconnect the wire to fan. btw laser thermometer are good investments to double check the temp, , Would by chance youre using Mr Gasket thermostats?? because it sounds like a thermostat to me

 

My car does the exact same thing. I disconnected the fan and it ran up to temp. like it should. When I turned it off to plug fan back in it sounded like it was about to boil over. Once the fan took over it went back down to 130 degrees. What to do now?

 

replace your fan switch, http://www.autozone.com/autozone/cat...&parentId=63-0 7 bucks, its between the 6-8 cylinder. careful will the connector on the switch/sensor, its so brittle mine broke and i had to solder a new connector to the harness. you should be golden after that. Part # SW502 at autozone (for 1988 chevy camaro 5.0L

 

Thanks alot TransAm85. I'll try that.

 

Is that easier to get to from the top or bottom of the car?

 

its gonna be easier from the top

 

I don't even see this switch, too much crap in my way. Is it on the cylinder head?

 

its on the block, right above the knock sensor. i had to get underneath. you can feel it. imagine the 6th and 8th cylinders spark plugs, now in the middle below about 6 inches. one wire Check this link out http://www.superchevy.com/tech/0502s...ing/index.html it kinda helps.. What brand t-stat are you using?

 

That's an interesting link Transam. Might take that into consideration as driving in Texas gets a little warm.

 

Ok, that link says they put a chip in the computer... I know the computer is what tells the fans to switch on because of the temperature of the sensor, but does the lower temp sensor tell the ECM to turn the fans on or does the ECM need that chip to recognise it?

 

my fans always stay on and i cant figure out why.

 

The fan relay may have a direct ground on it, instead of being grounded by the ECM.