Question about 2001 Cadillac DeVille

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I don't have heat at idle; but I do when I am cruising down the road above 1500 rpms.

The greater the rpms the greater the heat...

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Does the temp gauge rise higher than normal ? the radiATOR COOLING FAN MAY NOT BE CUTTING IN . No heat at idle would also suggest the thermostat isn't opening correctly , so two things to check out

Posted on Nov 17, 2014

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My cruise button works & it lets me set it. Without braking, it disengages. The "possible fix" was to get a new brake light switch. It didn't fix my problem. Anybody have an ideas?? Thx. Mel

cruise controls need fully functional units to stay engaged
they include
brake sensor ,
clutch sensor ,
cruise switch
if any one has a problem it will disengage
also it only works above a certain road speed or engine rpms

Apr 23, 2017 | Cars & Trucks

1 Answer

How can I stop the truck from shutting down from idling bumping cruise up doesn't work

without know what engine and fuel system you have any answer is meaningless
but I will attempt to fill in the blanks
if it has a carby then set the idle off the throttle screw and set it to ( manual) 750 rpms ---auto--850 rpms
if it is EFI then run the fault codes to find the sensor that is failing and fix all the other faults
bumping the cruise( I take it that you tried to alter the cruise control setting) would make no difference as it is set at what ever rpms you have when travelling

Feb 15, 2016 | Cars & Trucks

1 Answer

I have some hesitation when idling and going down the road my rpms will go up and down, also i have a loud bang somtimes when let off the gas. ?????

might be your fuel pump going out, as it will run fine when it is cold. Then when it heats up it will like back fire and loose power going up hills.

Aug 09, 2010 | 2004 Dodge Ram 1500

1 Answer

Dodge ram 1500 engine rpms surge at freeway speed

those sensors could cause the issue, clean the MAF 1st, also clean the idle system using the following procedure, the IAC can cause cruise surge. I use this to cure these problems all the time.

Here is the most common cause of surges and stalls and low idle, it is the idle speed control air-bypass valve (IAC) and throttle valve, they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Jan 13, 2009 | 2001 Dodge Ram 2500 Truck

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No Heat in 99 Taurus

Just finished fixing my daughters 1999 taurus heat. It would blow warm only when running down the road. At idle it blew cold. I started with replacing thermostat, and water pump because they are the easier fix. Still did not help. Then I replaced the heater core. A daunting job but not that hard to move the dash slighly out of the way to replace. There is a good write up at After that, heat was better but at idle, it would still blow cool sometimes. Researched and found answer. Park car on the steepest hill you can find with front of car up. Start car and take off reservoir cap. Let car warm up and keep rpms about 1500. After a while the fluid will come running out of the car and all over the place but it will bring air bubbles with it. Reduce rpm, add more fluid and repeat about 3 times. It will make a mess but after that, the heater works perfectly. We get heat long before the temp gage indicates any and it never blows cold unless you lower the temp.

Nov 21, 2008 | 1999 Ford Taurus

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2005 Silverado chevrolet 1500 rpms, engine shut off

you may have a vac.hose leaking some were on the motor

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1999 Dodge Ram erratic idle

Try a throttle positioning sensor??

Oct 19, 2008 | 1999 Dodge Ram

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