Pontiac - Montana :: 2004 - Temperature Gauge Not Working Properly?
Nov 10, 2008
I have a 2004 Pontiac Montana with about 107500 kms on it (VIN: 1GMDX03E24D183870) and the coolant temperature gauge is not working properly. Sometimes when I start my van, the temp gauge is pinned at MAX temp and stays there the whole trip...other times it's pinned at MIN temp...and other times it seems to work OK.
When it's pinned at MAX temp, I check the actual temp that the on-board computer is seeing, by using my OBDII scan tool...and I get about 87 degrees C when I'm halfway into my trip (i.e. - when the van is at operating temp), which seems OK. All the other analog gauges are working perfectly.
I read a lot about the issues with "connector C305" on the Internet on the Montana vans...could this be the problem?
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Having a problem with my temperature gauge inside the truck. No matter how far or long I drive, the needle barely moves off of cold. Would the thermostat be the likely suspect? If not, what else could it be? There is no "check engine" light on and my ODB2 reader reads a temp of around 70c solid. If it is the thermostat, where is this part located in the car and would I need to replace JUST the thermostat or are there gaskets/housing-type things involved as well.
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I have a 2005 mk4 gli and the other morning I went out to start my car for work and all I got was crank no start. I then realized my fuel pump wasn't priming when I opened the driver door. After work I came back and checked the fuel pump fuse and swapped the relay with another I had, still nothing. A buddy of mine decided to check the connector at the fuel pump for power, using a power probe I believe he hit all or the majority of the wires with 12v of negative and/or positive power. He then unplugged the connecter and plugged it back in and the car fired right up. But I noticed that my fuel gauge, engine temp gauge, and outside air temp readout were all not functioning. I've searched and searched without being able to narrow down a solution.
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Temperature gauge quit working after changing the thermostat and coolant.
With the engine off, I disconnected the single wire from the temperature sending unit and switched on the ignition without starting engine. The gauge pointer stayed in at the Cold mark. Using a Jumper wire, I grounded the sending unit wire and the needle on the gauge went to the Hot mark.
I quickly turned off the ignition, and replaced the sending unit with a SW-2328 (F1SZ-10884-A) Temp Sender. Warmed up the engine, but still no reading on the dash gauge.
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Basically my coolant temperature gauge either reads as the hottest it can be, or the coldest. It doesn't jump around a whole bunch, but it's always all the way to one end or the other. From what I've read there seems to be a lot of different temperature sensors, so I get a little confused with all of the abbreviations, but I'm fairly certain I checked the correct one, next to the thermostat housing.
Using a multimeter I checked the resistance of the sensor, and it was around 600 ohms about 30 minutes after it had been driven. I'm not sure if this is where it should be or not, but it was rising as the truck cooled off.
Anyway, I'm not sure if I just tested the sensor incorrectly or if there could be another issue. A friend of mine suggested that the thermostat may have gotten stuck or something, but it doesn't seem like the gauge would switch at all if that were the case. What I should check to try and fix this.
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Vibrates above 45 mph. Did have tires balanced . Still happens.
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2002 ford sport trac.I have been having an ongoing issue that started with the engine cranking but would not turn over until an hour passed. After replacing multiple parts (cam shaft sensor, crankshaft sensor, ignition pack) I am now down to poor fuel economy as the last of the issues (roughly 12 in the city and 15 highway). I was told the issue may be the engine coolant temperature sensor going bad so I decided to replace it. I found this was very difficult due to it being a plug and locking pin design and in a very tight spot in the engine.
I tried to purchase a replacement and the parts store kept trying to insist on selling me a part with threading. I finally found someone that figured out the issue and found the part for the 2001 sport trac had the same plug style with clip that did fit but was shaped a little different on the sensor end which I assume was due to being aftermarket. I noticed that there were two plugs side by side and the one easiest to access was on the left and I was told the one on the right was the sensor that gave the temperature reading to the gauge.
After installing the engine coolant temperature sensor I found the temperature gauge on the dash now will not respond and is sitting below the cold end of the gauge completely off. Is it possible this is because the part was for a 2001? Is the sensor on the left (passenger side) the engine coolant sensor?I would hate to put the old sensor back in just to test if that's the issue due how difficult it was to put that locking pin back on. What to check that could resolve the gauge issue before pulling this sensor back out?
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