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sounds like a bad faucet//only if you had good pressure before it was installed..to cheaply test..take the hot water off from the shutoff valve and spray it into a milk jug to see if theres good flow..then replace the faucet assmbly..dont forget to turn off the shutoff valve first..or you will get a watery surprise!
Confirm that the shut-off valve under the sink is open all the way. If it is, then close it and remove the cold water tap. If this is a single handle tap you will of course have to turn off the hot water shut off under the sink too.
With the tap removed and a bucket and towel handy, open the cold water shutoff just a little bit. If water comes rushing out, the problem is obviously with the tap. You may be able to clean or repair it, or you may have to replace it.
could be a number of things.
most mixer taps have flexible braided inlet hose's make shure there not kinked.
also there may be built pressure reducing valves,usually removerable,a plumbers job really.
is there servive valves on hot and cold if so make shure there fully on.good luck ,any qs ask
1. If by replacing the flexible hose you mean the hose for the pull-out portion - you have more than likely kinked or bent the supply line to the hot (left) side of the faucet.
a) If this supply is braided, then simply shutting of the water supply, removing the braided line and either replacing or attempting to straighten it out will be your best bet.
b) If the supply is copper, you will have to cut the line cleanly and carefully. you will then most likely need a 1/4" or 3/8" compression/quickconnect BY 1/2" IP fitting to complete your repair.
2. Other possibilities include:
a) Failure inside the faucet body which will most likely be warrantied by Grohe if you push them hard enough.
b) A problem at your hot water tank, most likely the outlet side and *perhaps* you hadn't noticed the problem elsewhere.
c) The hot valve failing to reopen fully despite all appearances; applies if you turned off the water under the sink for your repair.
I am assuming that your kitchen tap is leaking through the spout
if it is single lever you will need to remove the crown and spout by removing a small erasure size cap on the housing right under the spout or up near the back of the ever then use a hex wrench to remove the set screw( plug the drain holes do it does not go down the drain)
turn the water off (hot and cold ) under the sink remove the set screw and lift off the lever
at his point you can take an adjustible wrench(channel lock and tighten the big ring nut that holds the cartridge in place
temorairly put the handle back on and put the handle in the off position turn the water on under the sink and see if it stopped leaking
if it still leaks you have to turn the water back off and remove the lock nut then the cartridge and go to big box store with old cartridge and name of mfg and get a new one and install
If you have seperate hot and cold valves on top of sink deermne which is leaking by turning one off with oher on undr the sink
once you have determined which it is (hot or cold) take a phillips head screw driver( remove plastic clear cap on top of faucet handle with sharp crewdriver of knife blade) and remove the screw holdin the handle on to the stem(turn counter clock wise
be sure to turn water of under snk on both faucet risers after removing acrylic handle you then take an adjustible wrench and remove the crown nut turn counter clockwise until it comes off over stem
remove stem( looks like size of a pretzel about six inches long with washers on side and one on end
take the stem to local hardware(ace) or big box store and go to lumbing section ask clerk to inspect and recommend replacement washers or replacement stem (if needed)
go back reinstall and tighten crown nut snug( open (turn counter clockwise) tem valve before you snug it down with crown nut install acrykic or chrome handle with brass phillips screw then ut cap on and turn on water and check for leaks
Your question is: Why would the cold line water be luke warm?
In 30 years I've seen this maybe 10 times. It is relatively rare. But each time it was a cross connection between the hot and cold water lines. It could be this fixture is close to the hot water heater or the cross cnnection is in a faucet or it is in the way the water lines are piped. Anyway I would have to closely inspect the system while running the water in the fixtures in different combinations. Once the cross is located the easiest fix at this point is installing a check valve at the right point. You might consider utilizing thr Repair Directory to find a repairman. Make sure he has solved this type of problem before.
Feel free to contact me again! Please give me a rating here at fixya.com before you sign off Thank you, Harvey your Master Plumber