low temp / no heat

[odb93]

Is it still cold???

[badfunkn]

Oh yeah, still haven't figured it out.

[odb93]

My truck will not warm up. (ENGINE TEMP or Interior)

We have recently had a very cold wave come through, but it never gets above the "N" in normal. Usually runs around r or m and provides plenty of heat.

So the first thing I do is top off the coolant. (NO HELP< STILL COLD)

Then I change the thermostat...(NO HELP STILL COLD)

I also let it warm up when leaving work....It makes a green puddle in the parking lot. SO I changed the radiator.

Guess what.....NO CHANGE.

I have also installed cardboard to cut off some of the clean air and it has made no change.

What is the deal???

[badfunkn]

The low engine temp sounds like a faulty T-Stat. If you bought a cheap one (Stant) they can be bad right out of the box. I would try a better one and make sure its rated for 192F or even a higher temp. The green puddle has to be a leak. Also try purging the air out of the cooling system, I've heard that can cause some weird problems too. None these solutions have solved my problem but that doesn't mean it won't help you.

[odb93]

I know for sure my t stat is working. You can watch the temp come up to almost normal operating temp, then drops back down to the N in normal.

Ok let me hit you with some thougths I have had.....

The truck was so warm it would run you out last winter. So there are two options that it has to run cold this winter. There has to be a configuration change or there is a faulty part somewhere.

I have not changed the configuration to my knowledge so that leaves a faulty part.

Now that we are here, what part of the cooling system would make the engine run cooler when broken.....The T-stat. So I replaced it. No change. Still cold.

Here is an idea I conjured up last night.

The fan on my truck has a clutch on it. The fan is designed to pull maximum air flow through the radiator until the engine reaches normal operating temp. When this has been achieved, the clutch allows the fan to slip some causing less air to be pulled through the radiator.

This is something I have not seen posted on here.

FAN CLUTCH!!!!!!!!

I am going to try it this Friday.

[badfunkn]

Good luck, let us know how it works. Unfortunately for me I don't think that's my problem. That wouldn't stop water from flowing through the heater core. I'm going to rplace the water pump this weekend and see what happens.

[odb93]

So your engine operates are normal temp?????

That is the root of my problem. The interior will not get warm/hot unless the motor is warm.

Mine is not.

[krazibimmer]

have you check the temp. blend door or flapper to see if its opening or not?

[odb93]

I have a small amount of heat, but nothing like it used to be.

The motor is not running as hot as it used to.

[Tedowski]

New here. Glad to find this forum. I have a 94 Ranger, 3.0 L. No heat at idle. (Even after 30 minutes) Minimal heat while driving. Bought it in April 03 with a new radiator, heater core and thermostat. Both heater hoses get warm. Blower motor is fine. Temp gauge runs in the low range.

The fan clutch idea sounds ok, but I'm leading towards the water pump.

Badfunkn - let us know if the pump solves the problem!

[badfunkn]

Tedowski, does your model have a heater control valve? Mine doesn't (93 2.3L) so I'm not sure where yours would be. Look close to the fire wall where your core hoses are run, there might be some sort of switch or valve. If the valve doesn't work water won't flow through the core. Have you tried purging the air out of the system yet?

[Tedowski]

Badfunkn - My truck doesn't have a heater control valve. I did notice a little coolant on the pump though. I made a few calls and found a new pump today for $25, so I figure it's cheap enough to just bolt on a new one. Now I just need to find a heated garage to work on it.

[90RANGER]

The Fan Clutch Has Nothing To Do With The Heat. What It Does Is Keeps It From Over Heating. And If It Is Bad Your Truck Will Over Heat.

[badfunkn]

I'm feeling you on the heated garage, we've had a blistering 20 degrees here all week. My garage is too small to bring the whole truck inside and still be able to work.

[Bronco2]

Has anybody checked the "doors" in the interior vent system ? I see no model years,engine size,etc. with these posts, but if the hot/cold air door is staying in the cold position,you get no heat.