Cadillac DeVille

Dextron-Mercon

No heat could mean several possibilities.

Low coolant level. Check to make sure you have enough coolant -- check the overflow resevoir. Only check radiator when the engine is COLD. NEVER open a radiator cap when an engine is warm or hot.

If you're not sure, with the engine off, squeeze the upper radiator hose with your hand. If it feels warm, and especially if it feels firm or hard, then the coolant is under pressure. DO NOT OPEN the cap until the engine cools off.

If you're really low on coolant and need to add coolant to the radiator, fill it up, then start the engine with the radiator cap off. The coolant level should drop right away.

Add some more coolant. It is usually a good idea to let the engine run until the thermostat opens. This can take a little while...until the engine warms up completely. Slowly raising and lowering the engine speed with your foot on the gas pedal will heat the engine faster. You never have to make the engine race or anything, just a fast idle and then slow it down. The coolant will slowly rise, and may even overflow the radiator a little. Then it will suddenly drop. This means the thermostat has opened. Top it off and put that radiator cap back on all the way. Make sure the overflow resivoir is filled to the right level too.

The engine thermostat might be bad and your engine running too cool.

The heater core might be plugged internally with sediment or externally clogged with dirt, leaves or other debris.

Some cars have a "heater control valve" inline with one of the heater hoses. It is usually vacuum controlled. If it fails you may not get heat. Don't know if your car has one.

There is a "diverter like" door near the heater core inside the heating system that adjusts to let hot air or cold air into the passenger compartment. If this door is stuck, or not getting the proper signal to open, (I think it is vacuum controlled) then you won't get warm air. One of the the vacuum lines under the dash connected to the controller of this door may have come loose.

The main question is how many miles on the car?

What was the "normal" temp range observed before.

What has changed...?

Are you driving to a different location everyday.. new vehicle?

My caddy is now hitting 217 at times still and 212 to 215 after 15 miles. (winter time) I repaired a cracked plastic radiator with a replacement. I think the bearing on my car and the gaskets are worn and oil leaks/burns at about 1/2 Q per 250 miles or less. Now i get low oil pressure warnings on a fully warmed vehicle. Dumped in a can of STP and that warning subsided in frequency. What do I expect at 167, 000 miles?

I think maybe radiator cap could have bad rubber and maybe not holding pressure at full temp.. maybe the oil viscosity/pressure problem is another key issue--if the engine is tired like mine.

So does that cover the vehicle in part that you are asking about 217F degree temps?

Not a simple solution.. the answer is how much do you plan to spend to "fix" the issues that the 217 temp might represent. At minimal I would venture the radiator cap.. or the radiator is original and cracked on the end and venting-- you might not even smell it much.

That sound like a loose connection..pull the switch to the ON position play with the wiring . look at the dimmer switch.. check your ground wire. GOOD LUCK..NOW..LOL..tell me where the FUEL PUMP RELAY is on a 1979 Cadillac Seville( not under the hood)

If the ignition control module has the exact wiring, and is for the exact same number of coils, (3 coils for a six cylinder, and 4 for an eight), then it will work. I actually have a 4 coil pack unit that will work with an 8 cylinder for $100.00. It is used but works fine, and has 4 coils already attached. I bought it for my 98 Eldorado, and it turned out to be a bad fuel pump. buckeyefanted@aol.com if yer interested.

P0300 Diagnostic Code - Random Misfire

Symptoms.
Engine may stumble or miss
Engine may be hard to start
you may notice no issues

Cause
Failing spark plugs or spark plug wires
Bad coil or coil pack
Failing oxygen sensor(s)
Bad fuel injector or more than one
Stuck exhaust valve
Bad catalytic converter
EGR valve or valve passage clogging
Bad camshaft position sensor
Bad PCM or ECM

The Fix
Best first action is a tune up, new plugs, wires, inspect all hoses and wire connections then reset the code. If it returns you will need to narrow it down to a system, coils and coil packs should be tested, catalytic converters for function ( do you smell rotten eggs?). A misfire that jumps cylinders could indicate a lean condition, do you have any other codes along with the 300? this will help clue you in to the source, check valve function to make sure they are opening and closing fully.
This is probably pone of the most difficult codes to troubleshoot, so start with the basics and work your way into the more expensive options, in many cases a good old tune up solves the problem, back it up with a fuel system cleaning and see where you stand.

depending on what model you have it is usually on the rear suspension frame.

Instead of using light bulbs, they used candles.

The drain cock is at the bottom of the radiator above the splash shield. Either you will need to remove the shield or you will need a piece of 3/8" hose about 12 to 14 inches long to attach to the drain tube.

Get a helper to turn on the ignition without starting the engine. At the same time you listen at the fuel filler door with the fuel cap off. You should hear the pump run for a few seconds and then shut down. If you do not hear the pump check the fuel pump fuse and fuel pump relay. If they are good the pump is defective. If the pump runs and you are not getting fuel to the engine either the fuel filter is clogged or the pump is running but not pumping fuel. Replace the fuel filter and proceed from there.

if it is the kind you use with your foot, like in my old '98, just press on it agian. you should here a click then let your foot off. if this does not work then you have to use your hand. reach up to brake bar and feel around the hinge for it. around there, there may be a second metal thingy. try to move it, and it will relese the brake.

bad oil pressure sending unit

yes as long as it has the amp remote and the two audio cables

YOUR GOING TO NEED A BRAKE CUBE, I BELIEVE THE ONLY WAY TO DEPRESS CALIPER IS TO SCREW IT BACK IN. ABOUT 13.00 BUCKS

I was able to use the open end of a 3/4 inch box wrench to retract the caliper. Just stick it straight into the groves then I used a wracthet handle in the closed end of the wrench to spin it. Of course the proper tool is a better idea but if you already have the car apart as I did works in a pinch.

Howie:great advise on the caliper it does screw in but when you at turning it you can also if you have on use a pully fork and a pair of channel locks to turn caliper, faster and saves you 25.00 at autozone.

240SX came with 2 different lug patterns. All 1989 to 1994 240sx came with a 4 lug 4x114.3 pattern. While the 1995-1998 240sx SE/LE's came with a 5 lug 5x114.3 pattern. Preferrably you'd want to find a wheel with less than +30 offset for 240SX's.

SAE 5w30 any major brand. Use a High Mileage oil if you have over 100,000 miles on the ODO.

Remove wires from "pull-down" Manually adjust mechanism to proper level Drill a small hole in threaded bolt in pull-down mechanism Secure position with a cotter pin

when you look the trunk of a 1994 cadillac deville which fuse u fuse do you pull out for the anti theft system?

i dont know tell me

When you add to it it will come on as soon as the pressure rises to the correct psi to trigger the switch, if you have a guage shoot for about 200 psi on the high side and it should be around 50 on the low. I recently replaced the compressor, drier, and temperature switch on my Isuzu and charged the system with the compressor off until the pressure level rose high enough to trigger the switch. It took quite a while to get the system up to full pressure ( several add attempts with wait time in the middle for system equalization ) every Tech I contacted told me dont do it, it wont work when I'm done but It works great and is the coldest air I have ever felt.

I have a 2000 DHS, and it has a stock Bose system and it sounds amazing!

20

check on the back side of the engine by looking underneath the car, you should see it there

Sounds like heater core is leaking and you are losing coolant causing overheating

This is a simple fix...I just bought a 2000 Deville and had the same issue...it's your AC Drain Hose...It's clogged up with dirt and grim...all you have to do is locate it under your car...which will be near the passenger dash underneath the car...if you can get to it..just get some pliers and pinch it open...problem solved....