QuestionI HAVE A 2004 CHEVY EX CAB WITH 81K MILES and my heater just stop working like it used to it works and gets hot but takes about an hour of driving before it heats up .. any help would be RAD thxx !!!!!!
AnswerThe first thing to check is whether your radiator has enough water.
With the engine running and hot, hold each pipe under the bonnet that carries the water round.
Please ensure that you are not wearing loose clothing and do this only if you are happy to do it.
Touch the hose at the top of the radiator and now the bottom one. Are they more or less the same temperature.
Do the same with the hoses in and out of the engine thermostat.This should be near the front of your engine at the top.
The hoses should not be too hot too touch but hot enough that you would want to take your hands off after a minute or so.
Now towards the back of the engine two rubber or possibly rubber and aluminum hoses go through the bulkhead/scuttle towards the car interior.
With the heater on full heat one should be really hot and the other hot but a bit cooler.
If all this is as it should be, you should have heat. My feeling is that the engine thermostat is not opening fully and therefore not allowing enough hot water in to the matrix quickly enough.
If it delivers heat eventually this tells us that all your heater flaps are open.
We are a uk company with no specialised knowledge of your vehicle. Try the basics anyway and see how you get on
Regards
