SOURCE: HEATER DOES NOT STAY HOT IT STARTS THEN IT GOES COLD
Check radiator fluid level. The heater core sets higher than the engine. If fluid gets low, air bubbles will go to the highest point. The heater core. Check temperature guage. Is engine warming up to normal range? If not change the thermostat. Also check radiator cooling fans with engine warm.
On my car if I set the heater control on anything other than "vent" both cooling fans come on and the engine will not warm up. (still haven't figured that one out) I just run the heater in "vent"
If heater warms up when engine is held at high idle(2000rpms) then cools down at idle, you most likely have air traped in the system.
SOURCE: hard to start hot or cold runs good when it starts
I think it may be time to change the spark plugs and wires.
SOURCE: My 2006 Colorado A/C runs , starts to blow cold
Same problem on 2005 Colorado at work. A little research finds that this is a 'gas saving' system. It is designed to cycle often, resulting in less UP time on the compressor, which saves fuel.
HORRIBLE system!
We are going to refill the freon to exact specs and see how the gauges read.
Currently, when compressor is running, a nice cool temp is achieved. But while the compressor is off, the air gets a bit warm. it's 112 out today and this is unsatisfactory.
I found a forum which describes installing a resistor at a certain wire connection in the a/c module. This causes the clutch to engage for longer periods of time. apparently the only real fix at the moment.
I don't have that forum link with me.... so do a bit more research to find it.
SOURCE: 1996 ford f150 inline 6 4.9l starts great cold but
Check for a bad temperature sensor. If there is any code, read it with a scanner, and it will usually tell you what is going on.
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