We have changed the water pump because it was leaking, and also installed two seperate thermostats trying to get it to heat up. also, removed the heater hose from the water pump to make sure we had a flow of water
2006-10-25 08:11:50 · 7 answers · asked by BOB R 1 in Cars & Transportation ➔ Maintenance & Repairs
There is a selector that you move to select hot or cold temp, and when you move it to the right all the way, it should open a door that allows air to travel through the heater core and into the truck. Is this cable off or broken? Listen for a hissing noise around under the dash, and the firewall under the hood. There could be a vacuum hose off, or leaking that is keeping it from opening the door. Some work by vacuum rather than by a cable. Look for a round ball looking vacuum storage tank on the passenger side under the hood, or a hose leading to under the fender well. This storage tank could be broken or the hose off of it not letting the heater controls have enough vacuum to work. Has the engine idle speed been higher than normal? If so, try to find the vacuum leak. Check all the hose's you can find, and follow under the hood and the dash. Is there a heater control valve in line in the heater hose? If so, make sure it is opening so as to allow hot water to the heater core. If none of this resolves the problem, then you will need to check the heater core itself by blowing air through it. Don't use too much pressure as it will break the core. Use enough to determine if it is in fact stopped up. Sometimes people will use stop leak to fix a radiator leak, and plug up the heater core in the process. Usually if the heater core is not plugged you will be able to feel both hoses where they exit the heater core, and if one is cold then you aren't getting a flow through the core for some reason. Does your radiator get hot enough at both the hoses? Is the thermostat in backwards? Are you positive the radiator is full of coolant? Sometimes a radiator is not full and the heater won't get any coolant. Thats all I can think to tell you. Good Luck!!!
2006-10-25 08:35:22 · answer #1 · answered by Anonymous · 1⤊ 0⤋
1987 F150
2016-09-28 08:34:15 · answer #2 · answered by Anonymous · 0⤊ 0⤋
This may sound really stupid but have you made sure that the radiator is full of coolant, as in while it is running can you see the coolant flowing and it is up to the top? If the coolant isn't full it will not get to the heater core. Meaning -- No Heat.
If the radiator is full, then you probably have a blocked heater core.
2006-10-25 08:22:32 · answer #3 · answered by pooterosa 5 · 0⤊ 1⤋
Calcium deposits - Calcium is in most of the water on this planet. Calcium will plug a heater core over time. There is several products on the market to FLUSH out the heater / radiator but none that i have tried work all that well. A new heater core is the best answer..........:)
2006-10-25 08:22:23 · answer #4 · answered by mrfatbobs 2 · 0⤊ 1⤋
one of a few things......do u have enough coolant in the radiator? Are all of ur hoses clear? Is ur heater core clogged? Is the thermostat opening? These would be the cheapest things to check. Also check ur oil dipstick.....hope there isnt any coolant mixed cuz then u have a blown head gasket.
2006-10-25 08:21:37 · answer #5 · answered by nonsense_5 3 · 0⤊ 1⤋
You have a fugitive from the junk yard, there. If the fan works and the cooling water heats up, you probably have an obstructed heater core. Hot water may not be getting through.
2006-10-25 08:16:07 · answer #6 · answered by regerugged 7 · 0⤊ 1⤋
if the thermostat has been taken out of the engine or is stuck open, the coolant might not be getting hot/warm. also, there is a valve under the hood that has to open to route coolant to the core .
2006-10-25 08:27:35 · answer #7 · answered by Anonymous · 0⤊ 1⤋