Supahonky Posted 13 hours ago Share Posted 13 hours ago (edited) I’ve got an 89 R model with an e6. In the winter my dumptruck would run cold and now things are warming up it would go up in temp and the I’d get a shutdown light and buzzer. Mainly when I was loaded on a warm day. I figured it was time for a thermostat. I just replaced it and now it warms up quick and holds an even temp however the shut down buzzer and light are on. My question is could a temp sensor to the warning be bad? The temp on the gauge is 155 but im not sure the accuracy of the gauge…. Edited 13 hours ago by Supahonky Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/ Share on other sites More sharing options...
Adkat Posted 12 hours ago Share Posted 12 hours ago Yep temp switch could be going bad. 155 sounds alright if your just poking about not really working the engine, possibly a little on the low side , would have thought it should be about 175-180ish. Get yourself an infrared temp gun and check the top pipe outlet to check the temp against the gauge Would have thought the temp warning lamp wouldn't come until around 220-230? But can't be sure. Adam Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/#findComment-576310 Share on other sites More sharing options...
Supahonky Posted 11 hours ago Author Share Posted 11 hours ago Is the temp sensor for the gauge on the radiator. And the one for the warning system on the coolant manifold? Any way to test them besides temp gun Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/#findComment-576312 Share on other sites More sharing options...
Joey Mack Posted 5 hours ago Share Posted 5 hours ago The warning is for low coolant, thats the one in the radiator tank. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/#findComment-576315 Share on other sites More sharing options...
Adkat Posted 5 hours ago Share Posted 5 hours ago 14 minutes ago, Joey Mack said: The warning is for low coolant, thats the one in the radiator tank. Figured you'd be along at some stage to get it sorted 🍻 Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/#findComment-576316 Share on other sites More sharing options...
Supahonky Posted 5 hours ago Author Share Posted 5 hours ago (edited) Ok so it has nothing to do with overheating? The only time it would do it is when the temp would go up? Also do I need to do anything to burp the engine or will it sort it self out? also it seems like the sensor is at the top of the radiator isn’t that an odd spot to get a reading for low level? so whats the fix just a new sensor? The coolant level has always been full btw Edited 5 hours ago by Supahonky Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/#findComment-576318 Share on other sites More sharing options...
Joey Mack Posted 4 hours ago Share Posted 4 hours ago One thing i do is remove one of the plugs in the top of the water manifold, right behind the thermostat housing. The thermostat has a small bleeder, but i just pull the plug then put it back in a full turn or so with the ratchet extension still in it to let air out, then tighten by hand when coolant starts to leak out. Some other guys use a hand vacuum pump on the radiator to suck out the air.. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/#findComment-576321 Share on other sites More sharing options...
Mark T Posted 4 hours ago Share Posted 4 hours ago Newer RDs like Joey's talking about at that plug behind the thermostat a blow gun across it with the plug out will help suck the coolant up in there too. Just for giggles, may want to try a wire with a couple alligator clips from engine to frame or cab to frame to make sure you're grounded. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/#findComment-576324 Share on other sites More sharing options...
Supahonky Posted 3 hours ago Author Share Posted 3 hours ago Why would it do it only when it gets to temp? Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/#findComment-576325 Share on other sites More sharing options...
Mark T Posted 2 hours ago Share Posted 2 hours ago 18 minutes ago, Supahonky said: Why would it do it only when it gets to temp? Grounds (or lack of) can do odd things on an older truck. Not saying it's the problem, but it's an easy thing to rule out. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/#findComment-576327 Share on other sites More sharing options...
70mackMB Posted 3 minutes ago Share Posted 3 minutes ago 2 hours ago, Mark T said: Grounds (or lack of) can do odd things on an older truck. Not saying it's the problem, but it's an easy thing to rule out. Bad cab grounds always seem to be the last thing to get checked. R&R everything else but never the ground strap! .....Hippy 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75563-r-model-with-e-6-temp-warning-light-help/#findComment-576334 Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.