Hi all, I am writing this for a friend to see if I can get any ideas for her.
She has a 94 Tercel, and has been complaining that there is no heat output. If the car is allowed to sit at idle for a while, some heat will be produced. This is where it gets odd....as the car is driven, the temp gauge will drop and the heat is gone.
I have not seen this before, myself I have had cars where the heat was low, but the engine was hot, temp gauge ok, etc etc.
I have not personally checked the fluid levels, but she says it is ok and has been driving around like this for a few years. If the fluid level was low, that engine would have been dead/fried long ago.
She replaced the thermostat recently, didn't help.
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Re: No heat, temp gauge low, need ideas...
Sounds like a chronic case of plugged heater core. Water can flow through the tubes as long as the flow is slow. When the engine speed is raised, the flow decreases. If you would like to contact me again about this or other problems, feel free to do so. Bill ASE Master Technician
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well check the coolant level. it sounds like you had a vapor lock and that would cause steam to escape and cause connections to get wet. this may have cause your battery to read dead. if you aren't low on coolant then i would start with the thermostat. that is easy to change and cheap. if you have low coolant then you may have vapor lock. to fix that you need to let the engine cool down and if you have a radiator cap remove it. look inside you should see coolant. if you don't fill up the radiator with coolant. with the cap off start the jeep and turn the heater on. let the engine warm up. watch the temp gauge and keep looking in the radiator. if you don't see coolant keep add it. at times it will bubble and burp this is normal. keep checking the temp gauge. now see if you feel heat coming out of the heater. if your feeling good heat then the system is circulating. (this mean your not in vapor lock anymore) let it keep running and keep adding coolant till it is full in the radiator. once full put the cap back on and fill the coolant tank to the full point. keep running it but keep checking the temp to be on the safe side. if the temp stay steady you should be good. hope this helps. please rate.
Most systems work pretty much the same. First check the fans themselves by hot wiring them to the battery. If they work, you need to check the engine temp sensor (some vehicles use one for gauge and fans, others use a separate one for fans) relay, and of course any fuses. You will help yourself a lot by getting either a chilton or haynes manual to show you how to do testing.
Ok, some clues, good. When the jeep has been driven for 10minutes, it should be at operating temperature. What does the temp. gauge indicate at that time? Is it on the low (cold) side, in the middle (normal) or near the hot end of the temp. gauge? Let me know the answer to the above, also check to coolant level and let me know what you find. If the coolant level is low, it can result in the engine running hot, and result in no heat. When the level is low, it won't circulate coolant through the heater core, which means you won't have heat. So let me know about the engine temp, and the coolant level, this is the easiest and simplest possibility of why you don't have heat. If this isn't the problem, do not rate my answer until I can help further after I get the above info from you.
1st check the coolant level. Low level will cause a no heat situation as you describe. What does the engine temp. gauge indicate? Is it indicating on the low side of normal, or is it in the normal range? If it indicates a low operating temp. after car warm up, the thermostat may be stuck open, which would not allow the car to fully warm up, and again, result in the no heat condition. Let me know about checking the coolant level, and temp gauge info. Curt